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Fixed #15165 -- Prevented wrong results with perimeter on geodetic fields.

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This commit is contained in:
Claude Paroz 2015-10-10 19:22:42 +02:00 • committed by Tim Graham
parent e051930123
commit 00cb9e13b4
4 changed files with 35 additions and 7 deletions
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18
tests/gis_tests/distapp/tests.py
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@ -444,6 +444,8 @@ Distance_Sphere(geom1, geom2) | N/A | OK (meter
Distance_Spheroid(geom1, geom2, spheroid) | N/A | OK (meters) | N/A
ST_Perimeter(geom1) | OK | :-( (degrees) | OK
================================
Distance functions on Spatialite
@ -457,6 +459,8 @@ ST_Distance(geom1, geom2, use_ellipsoid=True) | N/A | OK (
ST_Distance(geom1, geom2, use_ellipsoid=False) | N/A | OK (meters), less accurate, quick
Perimeter(geom1) | OK | :-( (degrees)
''' # NOQA
@ -688,6 +692,20 @@ class DistanceFunctionsTests(TestCase):
for city in qs:
self.assertEqual(0, city.perim.m)
@skipUnlessDBFeature("has_Perimeter_function")
def test_perimeter_geodetic(self):
# Currently only Oracle supports calculating the perimeter on geodetic
# geometries (without being transformed).
qs1 = CensusZipcode.objects.annotate(perim=Perimeter('poly'))
if connection.features.supports_perimeter_geodetic:
self.assertAlmostEqual(qs1[0].perim.m, 18406.3818954314, 3)
else:
with self.assertRaises(NotImplementedError):
list(qs1)
# But should work fine when transformed to projected coordinates
qs2 = CensusZipcode.objects.annotate(perim=Perimeter(Transform('poly', 32140))).filter(name='77002')
self.assertAlmostEqual(qs2[0].perim.m, 18404.355, 3)
@skipUnlessDBFeature("supports_null_geometries", "has_Area_function", "has_Distance_function")
def test_measurement_null_fields(self):
"""