author | Sverre Rabbelier <srabbelier@gmail.com> |
Sat, 21 Feb 2009 21:56:55 +0000 | |
changeset 1446 | bcbbcb72429d |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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1 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
2 |
The Spatial Reference class, represensents OGR Spatial Reference objects. |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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3 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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4 |
Example: |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
5 |
>>> from django.contrib.gis.gdal import SpatialReference |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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6 |
>>> srs = SpatialReference('WGS84') |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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7 |
>>> print srs |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
8 |
GEOGCS["WGS 84", |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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9 |
DATUM["WGS_1984", |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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10 |
SPHEROID["WGS 84",6378137,298.257223563, |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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11 |
AUTHORITY["EPSG","7030"]], |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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12 |
TOWGS84[0,0,0,0,0,0,0], |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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13 |
AUTHORITY["EPSG","6326"]], |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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14 |
PRIMEM["Greenwich",0, |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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15 |
AUTHORITY["EPSG","8901"]], |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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16 |
UNIT["degree",0.01745329251994328, |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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17 |
AUTHORITY["EPSG","9122"]], |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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18 |
AUTHORITY["EPSG","4326"]] |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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19 |
>>> print srs.proj |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
20 |
+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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21 |
>>> print srs.ellipsoid |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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22 |
(6378137.0, 6356752.3142451793, 298.25722356300003) |
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parents:
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23 |
>>> print srs.projected, srs.geographic |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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24 |
False True |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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25 |
>>> srs.import_epsg(32140) |
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parents:
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26 |
>>> print srs.name |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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27 |
NAD83 / Texas South Central |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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28 |
""" |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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29 |
import re |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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30 |
from types import UnicodeType, TupleType |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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31 |
from ctypes import byref, c_char_p, c_int, c_void_p |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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32 |
|
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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33 |
# Getting the error checking routine and exceptions |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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34 |
from django.contrib.gis.gdal.error import OGRException, SRSException |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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35 |
from django.contrib.gis.gdal.prototypes.srs import * |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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36 |
|
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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37 |
#### Spatial Reference class. #### |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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38 |
class SpatialReference(object): |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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39 |
""" |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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40 |
A wrapper for the OGRSpatialReference object. According to the GDAL website, |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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41 |
the SpatialReference object "provide[s] services to represent coordinate |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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42 |
systems (projections and datums) and to transform between them." |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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43 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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44 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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45 |
# Well-Known Geographical Coordinate System Name |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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46 |
_well_known = {'WGS84':4326, 'WGS72':4322, 'NAD27':4267, 'NAD83':4269} |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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47 |
_epsg_regex = re.compile('^(EPSG:)?(?P<epsg>\d+)$', re.I) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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48 |
_proj_regex = re.compile(r'^\+proj') |
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parents:
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49 |
|
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parents:
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50 |
#### Python 'magic' routines #### |
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parents:
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51 |
def __init__(self, srs_input='', srs_type='wkt'): |
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parents:
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52 |
""" |
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parents:
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53 |
Creates a GDAL OSR Spatial Reference object from the given input. |
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parents:
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54 |
The input may be string of OGC Well Known Text (WKT), an integer |
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parents:
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55 |
EPSG code, a PROJ.4 string, and/or a projection "well known" shorthand |
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parents:
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56 |
string (one of 'WGS84', 'WGS72', 'NAD27', 'NAD83'). |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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57 |
""" |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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58 |
# Intializing pointer and string buffer. |
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parents:
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59 |
self._ptr = None |
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parents:
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60 |
buf = c_char_p('') |
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parents:
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61 |
|
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parents:
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62 |
if isinstance(srs_input, basestring): |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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63 |
# Encoding to ASCII if unicode passed in. |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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64 |
if isinstance(srs_input, UnicodeType): |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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65 |
srs_input = srs_input.encode('ascii') |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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66 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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67 |
epsg_m = self._epsg_regex.match(srs_input) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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68 |
proj_m = self._proj_regex.match(srs_input) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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69 |
if epsg_m: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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70 |
# Is this an EPSG well known name? |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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71 |
srs_type = 'epsg' |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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72 |
srs_input = int(epsg_m.group('epsg')) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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73 |
elif proj_m: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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74 |
# Is the string a PROJ.4 string? |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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75 |
srs_type = 'proj' |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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76 |
elif srs_input in self._well_known: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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77 |
# Is this a short-hand well known name? |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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78 |
srs_type = 'epsg' |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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79 |
srs_input = self._well_known[srs_input] |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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80 |
elif srs_type == 'proj': |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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81 |
pass |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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82 |
else: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
83 |
# Setting the buffer with WKT, PROJ.4 string, etc. |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
84 |
buf = c_char_p(srs_input) |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
85 |
elif isinstance(srs_input, int): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
86 |
# EPSG integer code was input. |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
87 |
if srs_type != 'epsg': srs_type = 'epsg' |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
88 |
elif isinstance(srs_input, c_void_p): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
89 |
srs_type = 'ogr' |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
90 |
else: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
91 |
raise TypeError('Invalid SRS type "%s"' % srs_type) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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92 |
|
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
93 |
if srs_type == 'ogr': |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
94 |
# SRS input is OGR pointer |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
95 |
srs = srs_input |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
96 |
else: |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
97 |
# Creating a new pointer, using the string buffer. |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
98 |
srs = new_srs(buf) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
99 |
|
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
100 |
# If the pointer is NULL, throw an exception. |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
101 |
if not srs: |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
102 |
raise SRSException('Could not create spatial reference from: %s' % srs_input) |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
103 |
else: |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
104 |
self._ptr = srs |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
105 |
|
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
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|
106 |
# Post-processing if in PROJ.4 or EPSG formats. |
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parents:
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changeset
|
107 |
if srs_type == 'proj': self.import_proj(srs_input) |
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parents:
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|
108 |
elif srs_type == 'epsg': self.import_epsg(srs_input) |
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parents:
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changeset
|
109 |
|
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parents:
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|
110 |
def __del__(self): |
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parents:
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changeset
|
111 |
"Destroys this spatial reference." |
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parents:
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|
112 |
if self._ptr: release_srs(self._ptr) |
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parents:
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|
113 |
|
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parents:
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|
114 |
def __getitem__(self, target): |
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parents:
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|
115 |
""" |
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parents:
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|
116 |
Returns the value of the given string attribute node, None if the node |
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parents:
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|
117 |
doesn't exist. Can also take a tuple as a parameter, (target, child), |
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parents:
diff
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|
118 |
where child is the index of the attribute in the WKT. For example: |
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parents:
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|
119 |
|
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parents:
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|
120 |
>>> wkt = 'GEOGCS["WGS 84", DATUM["WGS_1984, ... AUTHORITY["EPSG","4326"]]') |
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parents:
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|
121 |
>>> srs = SpatialReference(wkt) # could also use 'WGS84', or 4326 |
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parents:
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|
122 |
>>> print srs['GEOGCS'] |
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parents:
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|
123 |
WGS 84 |
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parents:
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|
124 |
>>> print srs['DATUM'] |
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parents:
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|
125 |
WGS_1984 |
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parents:
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|
126 |
>>> print srs['AUTHORITY'] |
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|
127 |
EPSG |
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parents:
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|
128 |
>>> print srs['AUTHORITY', 1] # The authority value |
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parents:
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|
129 |
4326 |
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parents:
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|
130 |
>>> print srs['TOWGS84', 4] # the fourth value in this wkt |
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parents:
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|
131 |
0 |
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parents:
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|
132 |
>>> print srs['UNIT|AUTHORITY'] # For the units authority, have to use the pipe symbole. |
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parents:
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|
133 |
EPSG |
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parents:
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|
134 |
>>> print srs['UNIT|AUTHORITY', 1] # The authority value for the untis |
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parents:
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|
135 |
9122 |
ff1a9aa48cfd
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parents:
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|
136 |
""" |
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parents:
diff
changeset
|
137 |
if isinstance(target, TupleType): |
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parents:
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|
138 |
return self.attr_value(*target) |
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parents:
diff
changeset
|
139 |
else: |
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parents:
diff
changeset
|
140 |
return self.attr_value(target) |
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parents:
diff
changeset
|
141 |
|
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parents:
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|
142 |
def __str__(self): |
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parents:
diff
changeset
|
143 |
"The string representation uses 'pretty' WKT." |
ff1a9aa48cfd
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parents:
diff
changeset
|
144 |
return self.pretty_wkt |
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parents:
diff
changeset
|
145 |
|
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parents:
diff
changeset
|
146 |
#### SpatialReference Methods #### |
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parents:
diff
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|
147 |
def attr_value(self, target, index=0): |
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parents:
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|
148 |
""" |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
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|
149 |
The attribute value for the given target node (e.g. 'PROJCS'). The index |
ff1a9aa48cfd
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parents:
diff
changeset
|
150 |
keyword specifies an index of the child node to return. |
ff1a9aa48cfd
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parents:
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|
151 |
""" |
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parents:
diff
changeset
|
152 |
if not isinstance(target, str) or not isinstance(index, int): |
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parents:
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|
153 |
raise TypeError |
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parents:
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changeset
|
154 |
return get_attr_value(self._ptr, target, index) |
ff1a9aa48cfd
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parents:
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changeset
|
155 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
156 |
def auth_name(self, target): |
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parents:
diff
changeset
|
157 |
"Returns the authority name for the given string target node." |
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parents:
diff
changeset
|
158 |
return get_auth_name(self._ptr, target) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
diff
changeset
|
159 |
|
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
160 |
def auth_code(self, target): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
diff
changeset
|
161 |
"Returns the authority code for the given string target node." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
162 |
return get_auth_code(self._ptr, target) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
163 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
164 |
def clone(self): |
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Load ../vendor/django into trunk/app/django.
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parents:
diff
changeset
|
165 |
"Returns a clone of this SpatialReference object." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
diff
changeset
|
166 |
return SpatialReference(clone_srs(self._ptr)) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
167 |
|
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
168 |
def from_esri(self): |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
169 |
"Morphs this SpatialReference from ESRI's format to EPSG." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
diff
changeset
|
170 |
morph_from_esri(self._ptr) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
diff
changeset
|
171 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
172 |
def identify_epsg(self): |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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changeset
|
173 |
""" |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
174 |
This method inspects the WKT of this SpatialReference, and will |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
175 |
add EPSG authority nodes where an EPSG identifier is applicable. |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
176 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
177 |
identify_epsg(self._ptr) |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
178 |
|
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
179 |
def to_esri(self): |
ff1a9aa48cfd
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parents:
diff
changeset
|
180 |
"Morphs this SpatialReference to ESRI's format." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
181 |
morph_to_esri(self._ptr) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
182 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
183 |
def validate(self): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
184 |
"Checks to see if the given spatial reference is valid." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
185 |
srs_validate(self._ptr) |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
186 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
187 |
#### Name & SRID properties #### |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
188 |
@property |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
189 |
def name(self): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
190 |
"Returns the name of this Spatial Reference." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
191 |
if self.projected: return self.attr_value('PROJCS') |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
192 |
elif self.geographic: return self.attr_value('GEOGCS') |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
193 |
elif self.local: return self.attr_value('LOCAL_CS') |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
194 |
else: return None |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
195 |
|
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
196 |
@property |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
197 |
def srid(self): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
198 |
"Returns the SRID of top-level authority, or None if undefined." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
199 |
try: |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
200 |
return int(self.attr_value('AUTHORITY', 1)) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
201 |
except (TypeError, ValueError): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
202 |
return None |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
203 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
204 |
#### Unit Properties #### |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
205 |
@property |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
206 |
def linear_name(self): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
207 |
"Returns the name of the linear units." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
208 |
units, name = linear_units(self._ptr, byref(c_char_p())) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
209 |
return name |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
210 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
211 |
@property |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
212 |
def linear_units(self): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
213 |
"Returns the value of the linear units." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
214 |
units, name = linear_units(self._ptr, byref(c_char_p())) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
215 |
return units |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
216 |
|
ff1a9aa48cfd
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parents:
diff
changeset
|
217 |
@property |
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parents:
diff
changeset
|
218 |
def angular_name(self): |
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parents:
diff
changeset
|
219 |
"Returns the name of the angular units." |
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parents:
diff
changeset
|
220 |
units, name = angular_units(self._ptr, byref(c_char_p())) |
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parents:
diff
changeset
|
221 |
return name |
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parents:
diff
changeset
|
222 |
|
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parents:
diff
changeset
|
223 |
@property |
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parents:
diff
changeset
|
224 |
def angular_units(self): |
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parents:
diff
changeset
|
225 |
"Returns the value of the angular units." |
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parents:
diff
changeset
|
226 |
units, name = angular_units(self._ptr, byref(c_char_p())) |
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parents:
diff
changeset
|
227 |
return units |
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parents:
diff
changeset
|
228 |
|
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parents:
diff
changeset
|
229 |
@property |
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parents:
diff
changeset
|
230 |
def units(self): |
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parents:
diff
changeset
|
231 |
""" |
ff1a9aa48cfd
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parents:
diff
changeset
|
232 |
Returns a 2-tuple of the units value and the units name, |
ff1a9aa48cfd
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parents:
diff
changeset
|
233 |
and will automatically determines whether to return the linear |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
234 |
or angular units. |
ff1a9aa48cfd
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parents:
diff
changeset
|
235 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
diff
changeset
|
236 |
if self.projected or self.local: |
ff1a9aa48cfd
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parents:
diff
changeset
|
237 |
return linear_units(self._ptr, byref(c_char_p())) |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
238 |
elif self.geographic: |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
239 |
return angular_units(self._ptr, byref(c_char_p())) |
ff1a9aa48cfd
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parents:
diff
changeset
|
240 |
else: |
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parents:
diff
changeset
|
241 |
return (None, None) |
ff1a9aa48cfd
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parents:
diff
changeset
|
242 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
243 |
#### Spheroid/Ellipsoid Properties #### |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
244 |
@property |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
245 |
def ellipsoid(self): |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
246 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
247 |
Returns a tuple of the ellipsoid parameters: |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
248 |
(semimajor axis, semiminor axis, and inverse flattening) |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
249 |
""" |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
250 |
return (self.semi_major, self.semi_minor, self.inverse_flattening) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
251 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
252 |
@property |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
253 |
def semi_major(self): |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
254 |
"Returns the Semi Major Axis for this Spatial Reference." |
ff1a9aa48cfd
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parents:
diff
changeset
|
255 |
return semi_major(self._ptr, byref(c_int())) |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
256 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
257 |
@property |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
258 |
def semi_minor(self): |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
259 |
"Returns the Semi Minor Axis for this Spatial Reference." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
diff
changeset
|
260 |
return semi_minor(self._ptr, byref(c_int())) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
261 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
262 |
@property |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
263 |
def inverse_flattening(self): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
264 |
"Returns the Inverse Flattening for this Spatial Reference." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
265 |
return invflattening(self._ptr, byref(c_int())) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
266 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
267 |
#### Boolean Properties #### |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
268 |
@property |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
269 |
def geographic(self): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
270 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
271 |
Returns True if this SpatialReference is geographic |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
272 |
(root node is GEOGCS). |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
273 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
274 |
return bool(isgeographic(self._ptr)) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
275 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
276 |
@property |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
277 |
def local(self): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
278 |
"Returns True if this SpatialReference is local (root node is LOCAL_CS)." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
279 |
return bool(islocal(self._ptr)) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
280 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
281 |
@property |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
282 |
def projected(self): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
283 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
284 |
Returns True if this SpatialReference is a projected coordinate system |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
285 |
(root node is PROJCS). |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
286 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
287 |
return bool(isprojected(self._ptr)) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
288 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
289 |
#### Import Routines ##### |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
290 |
def import_wkt(self, wkt): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
291 |
"Imports the Spatial Reference from OGC WKT (string)" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
292 |
from_wkt(self._ptr, byref(c_char_p(wkt))) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
293 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
294 |
def import_proj(self, proj): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
295 |
"Imports the Spatial Reference from a PROJ.4 string." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
296 |
from_proj(self._ptr, proj) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
297 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
298 |
def import_epsg(self, epsg): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
299 |
"Imports the Spatial Reference from the EPSG code (an integer)." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
300 |
from_epsg(self._ptr, epsg) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
301 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
302 |
def import_xml(self, xml): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
303 |
"Imports the Spatial Reference from an XML string." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
304 |
from_xml(self._ptr, xml) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
305 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
306 |
#### Export Properties #### |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
307 |
@property |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
308 |
def wkt(self): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
309 |
"Returns the WKT representation of this Spatial Reference." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
310 |
return to_wkt(self._ptr, byref(c_char_p())) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
311 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
312 |
@property |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
313 |
def pretty_wkt(self, simplify=0): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
314 |
"Returns the 'pretty' representation of the WKT." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
315 |
return to_pretty_wkt(self._ptr, byref(c_char_p()), simplify) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
316 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
317 |
@property |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
318 |
def proj(self): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
319 |
"Returns the PROJ.4 representation for this Spatial Reference." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
320 |
return to_proj(self._ptr, byref(c_char_p())) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
321 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
322 |
@property |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
323 |
def proj4(self): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
324 |
"Alias for proj()." |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
325 |
return self.proj |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
326 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
327 |
@property |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
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328 |
def xml(self, dialect=''): |
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329 |
"Returns the XML representation of this Spatial Reference." |
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330 |
# FIXME: This leaks memory, have to figure out why. |
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331 |
return to_xml(self._ptr, byref(c_char_p()), dialect) |
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|
332 |
|
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333 |
def to_esri(self): |
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334 |
"Morphs this SpatialReference to ESRI's format." |
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335 |
morph_to_esri(self._ptr) |
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336 |
|
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337 |
def from_esri(self): |
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338 |
"Morphs this SpatialReference from ESRI's format to EPSG." |
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339 |
morph_from_esri(self._ptr) |
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|
340 |
|
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341 |
class CoordTransform(object): |
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342 |
"The coordinate system transformation object." |
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|
343 |
|
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|
344 |
def __init__(self, source, target): |
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345 |
"Initializes on a source and target SpatialReference objects." |
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346 |
self._ptr = None # Initially NULL |
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347 |
if not isinstance(source, SpatialReference) or not isinstance(target, SpatialReference): |
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348 |
raise SRSException('source and target must be of type SpatialReference') |
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349 |
self._ptr = new_ct(source._ptr, target._ptr) |
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|
350 |
if not self._ptr: |
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|
351 |
raise SRSException('could not intialize CoordTransform object') |
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352 |
self._srs1_name = source.name |
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|
353 |
self._srs2_name = target.name |
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|
354 |
|
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|
355 |
def __del__(self): |
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356 |
"Deletes this Coordinate Transformation object." |
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|
357 |
if self._ptr: destroy_ct(self._ptr) |
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|
358 |
|
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|
359 |
def __str__(self): |
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|
360 |
return 'Transform from "%s" to "%s"' % (self._srs1_name, self._srs2_name) |