def test_get_common_geom(self):
""" Tests the creation of an encasing raster geometry from multiple raster geometries. """
# create different raster geometries
extent_a = self.extent
extent_b = tuple(np.array(extent_a) - 2) # shift extent negatively
extent_c = tuple(np.array(extent_a) + 2) # shift extent positively
# create raster geometries from different extents
raster_geom_a = self.raster_geom
raster_geom_b = RasterGeometry.from_extent(extent_b, self.sref, self.x_pixel_size, self.y_pixel_size)
raster_geom_c = RasterGeometry.from_extent(extent_c, self.sref, self.x_pixel_size, self.y_pixel_size)
raster_geom_d = RasterGeometry.from_extent(extent_a, self.sref, self.x_pixel_size*2, self.y_pixel_size*2)
# resize the main geometry
raster_geom_a.scale(0.5)
# create common raster geometry from the first three raster geometries
raster_geom = RasterGeometry.from_raster_geometries([raster_geom_a, raster_geom_b, raster_geom_c])
ll_x, ll_y = raster_geom_b.rc2xy(raster_geom_b.n_rows - 1, 0, px_origin="ll")
ur_x, ur_y = raster_geom_c.rc2xy(0, raster_geom_b.n_cols - 1, px_origin="ur")
new_extent = (ll_x, ll_y, ur_x, ur_y)
self.assertTupleEqual(raster_geom.outer_boundary_extent, new_extent)
# test if error is raised, when raster geometries with different resolutions are joined
try:
raster_geom = RasterGeometry.from_raster_geometries([raster_geom_a, raster_geom_b, raster_geom_c,
raster_geom_d])
except ValueError:
assert True
def test_intersection(self):
""" Tests intersection with different geometries. """
# test intersection with own geometry
raster_geom_intsct = self.raster_geom.slice_by_geom(
self.raster_geom.boundary, inplace=False)
assert self.raster_geom == raster_geom_intsct
# test intersection with scaled geometry
raster_geom_scaled = self.raster_geom.scale(0.5, inplace=False)
raster_geom_intsct = self.raster_geom.slice_by_geom(raster_geom_scaled,
inplace=False)
assert raster_geom_scaled == raster_geom_intsct
# test intersection with partial overlap
extent_shifted = tuple(np.array(self.extent) + 2)
extent_intsct = (extent_shifted[0], extent_shifted[1], self.extent[2],
self.extent[3])
raster_geom_shifted = RasterGeometry.from_extent(
extent_shifted, self.sref, self.x_pixel_size, self.y_pixel_size)
raster_geom_intsct = self.raster_geom.slice_by_geom(
raster_geom_shifted, inplace=False)
assert raster_geom_intsct.outer_boundary_extent == extent_intsct
# test intersection with no overlap
extent_no_ovlp = (self.extent[2] + 1., self.extent[3] + 1.,
self.extent[2] + 5., self.extent[3] + 5.)
raster_geom_no_ovlp = RasterGeometry.from_extent(
extent_no_ovlp, self.sref, self.x_pixel_size, self.y_pixel_size)
raster_geom_intsct = self.raster_geom.slice_by_geom(
raster_geom_no_ovlp, inplace=False)
assert raster_geom_intsct is None
def setUp(self):
""" Creates a normal and a rotated raster geometry with a random coordinate extent. """
# set up spatial reference system
self.sref = SpatialRef(4326)
# define region of interest/extent
ll_x = random.randrange(-50., 50., 10.)
ll_y = random.randrange(-50., 50., 10.)
ur_x = ll_x + random.randrange(10., 50., 10.)
ur_y = ll_y + random.randrange(10., 50., 10.)
self.sh_geom = Polygon(((ll_x, ll_y), (ll_x, ur_y), (ur_x, ur_y),
(ur_x, ll_y))) # Polygon in clock-wise order
self.ogr_geom = ogr.CreateGeometryFromWkt(self.sh_geom.wkt)
self.ogr_geom.AssignSpatialReference(self.sref.osr_sref)
self.extent = tuple(map(float, (ll_x, ll_y, ur_x, ur_y)))
self.x_pixel_size = 0.5
self.y_pixel_size = 0.5
self.raster_geom = RasterGeometry.from_extent(self.extent, self.sref,
self.x_pixel_size,
self.y_pixel_size)
# create rotated raster geometry
geom_nap = affinity.rotate(
shapely.wkt.loads(self.ogr_geom.ExportToWkt()), 45, 'center')
geom_nap = ogr.CreateGeometryFromWkt(geom_nap.wkt)
geom_nap.AssignSpatialReference(self.sref.osr_sref)
self.raster_geom_rot = RasterGeometry.from_geometry(
geom_nap, self.x_pixel_size, self.y_pixel_size)
def test_touches(self):
""" Tests if raster geometries touch each other. """
# create raster geometry which touches the previous one
extent_tchs = (self.extent[2], self.extent[3],
self.extent[2] + 5., self.extent[3] + 5.)
raster_geom_tchs = RasterGeometry.from_extent(extent_tchs, self.sref,
self.x_pixel_size, self.y_pixel_size)
assert self.raster_geom.touches(raster_geom_tchs)
# create raster geometry which does not touch the previous one
extent_no_tchs = (self.extent[2] + 1., self.extent[3] + 1.,
self.extent[2] + 5., self.extent[3] + 5.)
raster_geom_no_tchs = RasterGeometry.from_extent(extent_no_tchs, self.sref,
self.x_pixel_size, self.y_pixel_size)
assert not self.raster_geom.touches(raster_geom_no_tchs)
def test_not_equal(self):
""" Tests if two raster geometries are not equal. """
# create raster geometries from the given extent
raster_geom_a = self.raster_geom
raster_geom_b = RasterGeometry.from_extent(self.extent, self.sref, self.x_pixel_size, self.y_pixel_size)
# resize second raster geometry
raster_geom_b.scale(0.5, inplace=True)
assert raster_geom_a != raster_geom_b
def test_different_sref(self):
""" Test topological operation if the spatial reference systems are different. """
# create raster geometry which touches the previous one
extent_tchs = (self.extent[2], self.extent[3],
self.extent[2] + 5., self.extent[3] + 5.)
raster_geom_tchs = RasterGeometry.from_extent(extent_tchs, self.sref,
self.x_pixel_size, self.y_pixel_size)
# reproject to different system
sref_other = SpatialRef(3857)
geom = raster_geom_tchs.boundary_ogr
geom.TransformTo(sref_other.osr_sref)
assert self.raster_geom.touches(geom)
def test_plot(self):
""" Tests plotting function of a raster geometry. """
self.raster_geom.plot(add_country_borders=True)
# test plotting with labelling and different output projection
self.raster_geom.id = "E048N018T1"
self.raster_geom.plot(proj=ccrs.EckertI(), label_geom=True, add_country_borders=True)
# test plotting with different input projection
sref = SpatialRef(31259)
extent = [527798, 94878, 956835, 535687]
raster_geom = RasterGeometry.from_extent(extent, sref, x_pixel_size=500, y_pixel_size=500)
raster_geom.plot(add_country_borders=True)
def test_plot(self):
"""
Tests the `plot` function of a raster geometry. This test is only performed,
if matplotlib is installed.
"""
if 'matplotlib' in sys.modules:
self.raster_geom.plot(add_country_borders=True)
# test plotting with labelling and different output projection
self.raster_geom.name = "E048N018T1"
self.raster_geom.plot(proj=ccrs.EckertI(),
label_geom=True,
add_country_borders=True)
# test plotting with different input projection
sref = SpatialRef(31259)
extent = [527798, 94878, 956835, 535687]
raster_geom = RasterGeometry.from_extent(extent,
sref,
x_pixel_size=500,
y_pixel_size=500)
raster_geom.plot(add_country_borders=True)