def test_iter_intersects(self):
points = self.geom_michigan_point_grid
si = SpatialIndex()
ids = points.keys()
geoms = [points[i] for i in ids]
si.add(ids, geoms)
intersects_ids = list(si.iter_intersects(self.geom_michigan, points))
self.assertEqual(set(intersects_ids), set([22, 23, 24, 32, 33, 34, 35, 36, 42, 43, 44, 46, 56, 66, 67, 76]))
def test_rtree(self):
from ocgis.util.spatial.index import SpatialIndex
geom_mapping = {1: Point(1, 2)}
si = SpatialIndex()
si.add(1, Point(1, 2))
ret = list(si.iter_intersects(Point(1, 2), geom_mapping))
self.assertEqual(ret, [1])
def test_iter_intersects_with_polygon(self):
polygon = self.geom_michigan[1]
si = SpatialIndex()
points = self.geom_michigan_point_grid
ids = points.keys()
geoms = [points[i] for i in ids]
si.add(ids, geoms)
intersects_ids = list(si.iter_intersects(polygon, points))
self.assertEqual(intersects_ids, [67])
def test_iter_intersects_with_polygon(self):
polygon = self.geom_michigan[1]
# print 'michigan',self.write_geom_dict({1:polygon},geometry_type='Polygon')
si = SpatialIndex()
points = self.geom_michigan_point_grid
ids = points.keys()
geoms = [points[i] for i in ids]
si.add(ids,geoms)
intersects_ids = list(si.iter_intersects(polygon,points))
# new_geoms = {i:points[i] for i in intersects_ids}
# print 'points',self.write_geom_dict(new_geoms)
self.assertEqual(intersects_ids,[67])
def test_keep_touches(self):
points = self.geom_michigan_point_grid
si = SpatialIndex()
ids = points.keys()
geoms = [points[i] for i in ids]
si.add(ids,geoms)
touch_geom = Point(*mapping(self.geom_michigan)['coordinates'][0][0][3])
si.add(1000,touch_geom)
points[1000] = touch_geom
for keep_touches in [True,False]:
intersects_ids = list(si.iter_intersects(self.geom_michigan,points,keep_touches=keep_touches))
if keep_touches:
self.assertIn(1000,intersects_ids)
else:
self.assertNotIn(1000,intersects_ids)
def get_intersects_masked(self,polygon,use_spatial_index=True):
'''
:param polygon: The Shapely geometry to use for subsetting.
:type polygon: :class:`shapely.geometry.Polygon' or :class:`shapely.geometry.MultiPolygon'
:param bool use_spatial_index: If ``False``, do not use the :class:`rtree.index.Index`
for spatial subsetting. If the geometric case is simple, it may marginally
improve execution times to turn this off. However, turning this off for
a complex case will negatively impact (significantly) spatial operation
execution times.
:raises: NotImplementedError, EmptySubsetError
:returns: :class:`ocgis.interface.base.dimension.spatial.SpatialGeometryPointDimension`
'''
## only polygons are acceptable for subsetting. if a point is required,
## buffer it.
if type(polygon) not in (Polygon,MultiPolygon):
raise(NotImplementedError(type(polygon)))
## return a shallow copy of self
ret = copy(self)
## create the fill array and reference the mask. this is the outpout
## geometry value array.
fill = np.ma.array(ret.value,mask=True)
ref_fill_mask = fill.mask
## this is the path if a spatial index is used.
if use_spatial_index:
## keep this as a local import as it is not a required dependency
from ocgis.util.spatial.index import SpatialIndex
## create the index object and reference import members
si = SpatialIndex()
_add = si.add
_value = self.value
## add the geometries to the index
for (ii,jj),id_value in iter_array(self.uid,return_value=True):
_add(id_value,_value[ii,jj])
## this mapping simulates a dictionary for the item look-ups from
## two-dimensional arrays
geom_mapping = GeomMapping(self.uid,self.value)
_uid = ret.uid
## return the identifiers of the objects intersecting the target geometry
## and update the mask accordingly
for intersect_id in si.iter_intersects(polygon,geom_mapping,keep_touches=False):
sel = _uid == intersect_id
ref_fill_mask[sel] = False
## this is the slower simpler case
else:
## prepare the polygon for faster spatial operations
prepared = prep(polygon)
## we are not keeping touches at this point. remember the mask is an
## inverse.
for (ii,jj),geom in iter_array(self.value,return_value=True):
bool_value = False
if prepared.intersects(geom):
if polygon.touches(geom):
bool_value = True
else:
bool_value = True
ref_fill_mask[ii,jj] = bool_value
## if everything is masked, this is an empty subset
if ref_fill_mask.all():
raise(EmptySubsetError(self.name))
## set the returned value to the fill array
ret._value = fill
## also update the unique identifier array
ret.uid = np.ma.array(ret.uid,mask=fill.mask.copy())
return(ret)
