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Made SRID a required parameter for GDALRaster instantiation; refs #23804. 

Earlier versions of GDAL do not allow the srid to be set to 0,
so it should be a required parameter to ensure compatibility.
This commit is contained in:
Daniel Wiesmann 2015-03-17 11:33:25 +00:00 committed by Tim Graham
parent f269c1d6f6
commit b9cb81570e
3 changed files with 31 additions and 25 deletions
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6
django/contrib/gis/gdal/raster/source.py
View File

@ -90,6 +90,10 @@ class GDALRaster(GDALBase):
if 'width' not in ds_input or 'height' not in ds_input:
raise GDALException('Specify width and height attributes for JSON or dict input.')
# Check if srid was specified
if 'srid' not in ds_input:
raise GDALException('Specify srid for JSON or dict input.')
# Create GDAL Raster
self._ptr = capi.create_ds(
driver._ptr,
@ -108,7 +112,7 @@ class GDALRaster(GDALBase):
self.bands[i].nodata_value = band_input['nodata_value']
# Set SRID, default to 0 (this assures SRS is always instanciated)
self.srs = ds_input.get('srid', 0)
self.srs = ds_input.get('srid')
# Set additional properties if provided
if 'origin' in ds_input:

41
docs/ref/contrib/gis/gdal.txt
View File

@ -1118,9 +1118,10 @@ blue.
defines the raster source, it is either a path to a file or spatial data with
values defining the properties of a new raster (such as size and name). If the
input is a file path, the second parameter specifies if the raster should
be opened with write access. The following example shows how rasters can be
created from different input sources (using the sample data from the GeoDjango
tests, see the :ref:`gdal_sample_data` section)::
be opened with write access. If the input is raw data, the parameters ``width``,
``heigth``, and ``srid`` are required. The following example shows how rasters
can be created from different input sources (using the sample data from the
GeoDjango tests, see also the :ref:`gdal_sample_data` section)::
>>> from django.contrib.gis.gdal.raster.source import GDALRaster
>>> rst = GDALRaster('/path/to/your/raster.tif', write=False)
@ -1148,7 +1149,7 @@ blue.
The name of the source which is equivalent to the input file path or the name
provided upon instantiation.
>>> GDALRaster({'width': 10, 'height': 10, 'name': 'myraster'}).name
>>> GDALRaster({'width': 10, 'height': 10, 'name': 'myraster', 'srid': 4326}).name
'myraster'
.. attribute:: driver
@ -1163,14 +1164,14 @@ blue.
An in-memory raster is created through the following example:
>>> GDALRaster({'width': 10, 'height': 10}).driver.name
>>> GDALRaster({'width': 10, 'height': 10, 'srid': 4326}).driver.name
'MEM'
A file based GeoTiff raster is created through the following example:
>>> import tempfile
>>> rstfile = tempfile.NamedTemporaryFile(suffix='.tif')
>>> rst = GDALRaster({'driver': 'GTiff', 'name': rstfile.name,
>>> rst = GDALRaster({'driver': 'GTiff', 'name': rstfile.name, 'srid': 4326,
... 'width': 255, 'height': 255, 'nr_of_bands': 1})
>>> rst.name
'/tmp/tmp7x9H4J.tif' # The exact filename will be different on your computer
@ -1181,14 +1182,14 @@ blue.
The width of the source in pixels (X-axis).
>>> GDALRaster({'width': 10, 'height': 20}).width
>>> GDALRaster({'width': 10, 'height': 20, 'srid': 4326}).width
10
.. attribute:: height
The height of the source in pixels (Y-axis).
>>> GDALRaster({'width': 10, 'height': 20}).height
>>> GDALRaster({'width': 10, 'height': 20, 'srid': 4326}).height
20
.. attribute:: srs
@ -1198,12 +1199,12 @@ blue.
setting it to an other :class:`SpatialReference` or providing any input
that is accepted by the :class:`SpatialReference` constructor.
>>> rst = GDALRaster({'width': 10, 'height': 20})
>>> rst.srs
None
>>> rst.srs = 4326
>>> rst = GDALRaster({'width': 10, 'height': 20, 'srid': 4326})
>>> rst.srs.srid
4326
>>> rst.srs = 3086
>>> rst.srs.srid
3086
.. attribute:: geotransform
@ -1220,7 +1221,7 @@ blue.
The default is ``[0.0, 1.0, 0.0, 0.0, 0.0, -1.0]``.
>>> rst = GDALRaster({'width': 10, 'height': 20})
>>> rst = GDALRaster({'width': 10, 'height': 20, 'srid': 4326})
>>> rst.geotransform
[0.0, 1.0, 0.0, 0.0, 0.0, -1.0]
@ -1230,7 +1231,7 @@ blue.
reference system of the source, as a point object with ``x`` and ``y``
members.
>>> rst = GDALRaster({'width': 10, 'height': 20})
>>> rst = GDALRaster({'width': 10, 'height': 20, 'srid': 4326})
>>> rst.origin
[0.0, 0.0]
>>> rst.origin.x = 1
@ -1243,7 +1244,7 @@ blue.
point object with ``x`` and ``y`` members. See :attr:`geotransform`
for more information.
>>> rst = GDALRaster({'width': 10, 'height': 20})
>>> rst = GDALRaster({'width': 10, 'height': 20, 'srid': 4326})
>>> rst.scale
[1.0, -1.0]
>>> rst.scale.x = 2
@ -1256,7 +1257,7 @@ blue.
with ``x`` and ``y`` members. In case of north up images, these
coefficients are both ``0``.
>>> rst = GDALRaster({'width': 10, 'height': 20})
>>> rst = GDALRaster({'width': 10, 'height': 20, 'srid': 4326})
>>> rst.skew
[0.0, 0.0]
>>> rst.skew.x = 3
@ -1269,7 +1270,7 @@ blue.
``(xmin, ymin, xmax, ymax)`` in the spatial reference system of the
source.
>>> rst = GDALRaster({'width': 10, 'height': 20})
>>> rst = GDALRaster({'width': 10, 'height': 20, 'srid': 4326})
>>> rst.extent
(0.0, -20.0, 10.0, 0.0)
>>> rst.origin.x = 100
@ -1280,8 +1281,8 @@ blue.
List of all bands of the source, as :class:`GDALBand` instances.
>>> rst = GDALRaster({"width": 1, "height": 2, "bands": [{"data": [0, 1]},
... {"data": [2, 3]}]})
>>> rst = GDALRaster({"width": 1, "height": 2, 'srid': 4326,
... "bands": [{"data": [0, 1]}, {"data": [2, 3]}]})
>>> len(rst.bands)
2
>>> rst.bands[1].data()
@ -1360,7 +1361,7 @@ blue.
For example:
>>> rst = GDALRaster({'width': 4, 'height': 4, 'datatype': 1, 'nr_of_bands': 1})
>>> rst = GDALRaster({'width': 4, 'height': 4, 'srid': 4326, 'datatype': 1, 'nr_of_bands': 1})
>>> bnd = rst.bands[0]
>>> bnd.data(range(16))
>>> bnd.data()

3
tests/gis_tests/gdal_tests/test_raster.py
View File

@ -190,7 +190,8 @@ class GDALBandTests(unittest.TestCase):
'name': 'mem_rst',
'width': 10,
'height': 10,
'nr_of_bands': 1
'nr_of_bands': 1,
'srid': 4326,
})
bandmem = rsmem.bands[0]