270 lines
9.7 KiB
Python
270 lines
9.7 KiB
Python
"""
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gdalinfo tests/gis_tests/data/rasters/raster.tif:
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Driver: GTiff/GeoTIFF
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Files: tests/gis_tests/data/rasters/raster.tif
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Size is 163, 174
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Coordinate System is:
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PROJCS["NAD83 / Florida GDL Albers",
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GEOGCS["NAD83",
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DATUM["North_American_Datum_1983",
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SPHEROID["GRS 1980",6378137,298.2572221010002,
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AUTHORITY["EPSG","7019"]],
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TOWGS84[0,0,0,0,0,0,0],
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AUTHORITY["EPSG","6269"]],
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PRIMEM["Greenwich",0],
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UNIT["degree",0.0174532925199433],
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AUTHORITY["EPSG","4269"]],
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PROJECTION["Albers_Conic_Equal_Area"],
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PARAMETER["standard_parallel_1",24],
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PARAMETER["standard_parallel_2",31.5],
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PARAMETER["latitude_of_center",24],
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PARAMETER["longitude_of_center",-84],
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PARAMETER["false_easting",400000],
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PARAMETER["false_northing",0],
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UNIT["metre",1,
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AUTHORITY["EPSG","9001"]],
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AUTHORITY["EPSG","3086"]]
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Origin = (511700.468070655711927,435103.377123198588379)
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Pixel Size = (100.000000000000000,-100.000000000000000)
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Metadata:
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AREA_OR_POINT=Area
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Image Structure Metadata:
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INTERLEAVE=BAND
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Corner Coordinates:
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Upper Left ( 511700.468, 435103.377) ( 82d51'46.16"W, 27d55' 1.53"N)
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Lower Left ( 511700.468, 417703.377) ( 82d51'52.04"W, 27d45'37.50"N)
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Upper Right ( 528000.468, 435103.377) ( 82d41'48.81"W, 27d54'56.30"N)
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Lower Right ( 528000.468, 417703.377) ( 82d41'55.54"W, 27d45'32.28"N)
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Center ( 519850.468, 426403.377) ( 82d46'50.64"W, 27d50'16.99"N)
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Band 1 Block=163x50 Type=Byte, ColorInterp=Gray
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NoData Value=15
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"""
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import os
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import struct
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import tempfile
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import unittest
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from django.contrib.gis.gdal import HAS_GDAL
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from django.contrib.gis.gdal.error import GDALException
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from django.contrib.gis.shortcuts import numpy
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from django.utils import six
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from django.utils._os import upath
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from ..data.rasters.textrasters import JSON_RASTER
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if HAS_GDAL:
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from django.contrib.gis.gdal import GDALRaster
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from django.contrib.gis.gdal.raster.band import GDALBand
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@unittest.skipUnless(HAS_GDAL, "GDAL is required")
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class GDALRasterTests(unittest.TestCase):
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"""
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Test a GDALRaster instance created from a file (GeoTiff).
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"""
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def setUp(self):
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self.rs_path = os.path.join(os.path.dirname(upath(__file__)),
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'../data/rasters/raster.tif')
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self.rs = GDALRaster(self.rs_path)
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def test_rs_name_repr(self):
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self.assertEqual(self.rs_path, self.rs.name)
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six.assertRegex(self, repr(self.rs), "<Raster object at 0x\w+>")
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def test_rs_driver(self):
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self.assertEqual(self.rs.driver.name, 'GTiff')
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def test_rs_size(self):
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self.assertEqual(self.rs.width, 163)
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self.assertEqual(self.rs.height, 174)
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def test_rs_srs(self):
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self.assertEqual(self.rs.srs.srid, 3086)
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self.assertEqual(self.rs.srs.units, (1.0, 'metre'))
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def test_geotransform_and_friends(self):
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# Assert correct values for file based raster
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self.assertEqual(self.rs.geotransform,
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[511700.4680706557, 100.0, 0.0, 435103.3771231986, 0.0, -100.0])
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self.assertEqual(self.rs.origin, [511700.4680706557, 435103.3771231986])
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self.assertEqual(self.rs.origin.x, 511700.4680706557)
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self.assertEqual(self.rs.origin.y, 435103.3771231986)
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self.assertEqual(self.rs.scale, [100.0, -100.0])
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self.assertEqual(self.rs.scale.x, 100.0)
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self.assertEqual(self.rs.scale.y, -100.0)
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self.assertEqual(self.rs.skew, [0, 0])
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self.assertEqual(self.rs.skew.x, 0)
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self.assertEqual(self.rs.skew.y, 0)
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# Create in-memory rasters and change gtvalues
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rsmem = GDALRaster(JSON_RASTER)
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rsmem.geotransform = range(6)
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self.assertEqual(rsmem.geotransform, [float(x) for x in range(6)])
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self.assertEqual(rsmem.origin, [0, 3])
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self.assertEqual(rsmem.origin.x, 0)
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self.assertEqual(rsmem.origin.y, 3)
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self.assertEqual(rsmem.scale, [1, 5])
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self.assertEqual(rsmem.scale.x, 1)
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self.assertEqual(rsmem.scale.y, 5)
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self.assertEqual(rsmem.skew, [2, 4])
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self.assertEqual(rsmem.skew.x, 2)
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self.assertEqual(rsmem.skew.y, 4)
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self.assertEqual(rsmem.width, 5)
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self.assertEqual(rsmem.height, 5)
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def test_rs_extent(self):
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self.assertEqual(self.rs.extent,
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(511700.4680706557, 417703.3771231986,
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528000.4680706557, 435103.3771231986))
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def test_rs_bands(self):
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self.assertEqual(len(self.rs.bands), 1)
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self.assertIsInstance(self.rs.bands[0], GDALBand)
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def test_file_based_raster_creation(self):
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# Prepare tempfile
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rstfile = tempfile.NamedTemporaryFile(suffix='.tif')
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# Create file-based raster from scratch
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GDALRaster({
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'datatype': self.rs.bands[0].datatype(),
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'driver': 'tif',
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'name': rstfile.name,
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'width': 163,
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'height': 174,
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'nr_of_bands': 1,
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'srid': self.rs.srs.wkt,
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'origin': (self.rs.origin.x, self.rs.origin.y),
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'scale': (self.rs.scale.x, self.rs.scale.y),
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'skew': (self.rs.skew.x, self.rs.skew.y),
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'bands': [{
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'data': self.rs.bands[0].data(),
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'nodata_value': self.rs.bands[0].nodata_value
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}]
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})
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# Reload newly created raster from file
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restored_raster = GDALRaster(rstfile.name)
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self.assertEqual(restored_raster.srs.wkt, self.rs.srs.wkt)
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self.assertEqual(restored_raster.geotransform, self.rs.geotransform)
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if numpy:
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numpy.testing.assert_equal(
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restored_raster.bands[0].data(),
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self.rs.bands[0].data()
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)
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else:
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self.assertEqual(restored_raster.bands[0].data(), self.rs.bands[0].data())
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@unittest.skipUnless(HAS_GDAL, "GDAL is required")
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class GDALBandTests(unittest.TestCase):
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def setUp(self):
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self.rs_path = os.path.join(os.path.dirname(upath(__file__)),
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'../data/rasters/raster.tif')
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rs = GDALRaster(self.rs_path)
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self.band = rs.bands[0]
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def test_band_data(self):
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self.assertEqual(self.band.width, 163)
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self.assertEqual(self.band.height, 174)
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self.assertEqual(self.band.description, '')
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self.assertEqual(self.band.datatype(), 1)
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self.assertEqual(self.band.datatype(as_string=True), 'GDT_Byte')
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self.assertEqual(self.band.min, 0)
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self.assertEqual(self.band.max, 255)
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self.assertEqual(self.band.nodata_value, 15)
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def test_read_mode_error(self):
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# Open raster in read mode
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rs = GDALRaster(self.rs_path, write=False)
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band = rs.bands[0]
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# Setting attributes in write mode raises exception in the _flush method
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self.assertRaises(GDALException, setattr, band, 'nodata_value', 10)
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def test_band_data_setters(self):
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# Create in-memory raster and get band
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rsmem = GDALRaster({
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'datatype': 1,
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'driver': 'MEM',
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'name': 'mem_rst',
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'width': 10,
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'height': 10,
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'nr_of_bands': 1
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})
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bandmem = rsmem.bands[0]
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# Set nodata value
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bandmem.nodata_value = 99
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self.assertEqual(bandmem.nodata_value, 99)
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# Set data for entire dataset
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bandmem.data(range(100))
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if numpy:
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numpy.testing.assert_equal(bandmem.data(), numpy.arange(100).reshape(10, 10))
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else:
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self.assertEqual(bandmem.data(), range(100))
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# Prepare data for setting values in subsequent tests
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block = range(100, 104)
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packed_block = struct.pack('<' + 'B B B B', *block)
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# Set data from list
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bandmem.data(block, (1, 1), (2, 2))
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result = bandmem.data(offset=(1, 1), size=(2, 2))
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if numpy:
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numpy.testing.assert_equal(result, numpy.array(block).reshape(2, 2))
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else:
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self.assertEqual(result, block)
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# Set data from packed block
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bandmem.data(packed_block, (1, 1), (2, 2))
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result = bandmem.data(offset=(1, 1), size=(2, 2))
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if numpy:
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numpy.testing.assert_equal(result, numpy.array(block).reshape(2, 2))
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else:
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self.assertEqual(result, block)
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# Set data from bytes
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bandmem.data(bytes(packed_block), (1, 1), (2, 2))
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result = bandmem.data(offset=(1, 1), size=(2, 2))
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if numpy:
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numpy.testing.assert_equal(result, numpy.array(block).reshape(2, 2))
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else:
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self.assertEqual(result, block)
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# Set data from bytearray
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bandmem.data(bytearray(packed_block), (1, 1), (2, 2))
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result = bandmem.data(offset=(1, 1), size=(2, 2))
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if numpy:
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numpy.testing.assert_equal(result, numpy.array(block).reshape(2, 2))
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else:
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self.assertEqual(result, block)
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# Set data from memoryview
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bandmem.data(six.memoryview(packed_block), (1, 1), (2, 2))
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result = bandmem.data(offset=(1, 1), size=(2, 2))
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if numpy:
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numpy.testing.assert_equal(result, numpy.array(block).reshape(2, 2))
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else:
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self.assertEqual(result, block)
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# Set data from numpy array
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if numpy:
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bandmem.data(numpy.array(block, dtype='int8').reshape(2, 2), (1, 1), (2, 2))
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numpy.testing.assert_equal(
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bandmem.data(offset=(1, 1), size=(2, 2)),
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numpy.array(block).reshape(2, 2)
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)
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# Test json input data
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rsmemjson = GDALRaster(JSON_RASTER)
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bandmemjson = rsmemjson.bands[0]
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if numpy:
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numpy.testing.assert_equal(
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bandmemjson.data(),
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numpy.array(range(25)).reshape(5, 5)
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)
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else:
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self.assertEqual(bandmemjson.data(), range(25))
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