def rook_boolean_connectivity(areal_unit_qset):
""" Boolean connectivity, two regions are connected if they share a line """
from django.contrib.gis.geos import Polygon
names = [x.name for x in areal_unit_qset]
W = DataFrame(dict([(x, 0.) for x in names]), index=names)
for r in areal_unit_qset:
qset = areal_unit_qset.filter(mpoly__intersects=r.mpoly)
coords = r.mpoly.coords
for polycoords in coords:
# discard z axis
poly = Polygon(polycoords[0])
for q in qset:
if q.id == r.id:
# don't consider self-overlaps
continue
other_coords = q.mpoly.coords
for otherpolycoords in other_coords:
other_poly = Polygon(otherpolycoords[0])
if isinstance(poly.union(other_poly), Polygon):
# shared boundary
W[r.name][q.name] = 1.
W[q.name][r.name] = 1.
for i in range(len(W)):
try:
W.iloc[i] /= sum(W.iloc[i])
except ZeroDivisionError:
pass
return W
def shape_to_geos(shape, srs, unit="m"):
args = []
for point_index in range(0, len(shape.points)):
if point_index in shape.parts:
args.append([])
point = shape.points[point_index]
point = srs_to_latlng(point[0], point[1], srs, unit)
args[-1].append([point[1], point[0]])
polygon = Polygon(*args)
try:
polygon.union(
polygon) #this will fail if the polygon is actual a MultiPolygon
except GEOSException as e:
polygon = MultiPolygon([Polygon(p) for p in polygon])
return polygon
def download_geometry(self) -> Optional[Polygon]:
if not self.layer_elements:
self.check(self.aoi)
bboxes = self.get_bboxes(self.layer_elements)
polygon = Polygon()
for bbox in bboxes:
polygon = polygon.union(Polygon.from_bbox(bbox))
if polygon.area:
return polygon
return None
def map_compare(request):
id1 = request.POST.get("id1", False)
id2 = request.POST.get("id2", False)
interesting_area = request.POST.get("interesting_area", False)
interesting_area_list = []
origin = Polygon()
for ir in interesting_area:
origin = origin.union(GEOSGeometry(ir))
mask1_building = Mask.objects.get(map=id1, type_id=1).mask.union(origin)
mask1_farm = Mask.objects.get(map=id1, type_id=5).mask.union(origin)
mask1_forest = Mask.objects.get(map=id1, type_id=7).mask.union(origin)
mask1_shack = Mask.objects.get(map=id1, type_id=6).mask.union(origin)
mask1_water = Mask.objects.get(map=id1, type_id=4).mask.union(origin)
mask1_grass = Mask.objects.get(map=id1, type_id=3).mask.union(origin)
mask1_road = Mask.objects.get(map=id1, type_id=2).mask.union(origin)
mask2_building = Mask.objects.get(map=id2, type_id=1).mask.union(origin)
mask2_rest = Mask.objects.get(map=id2, type_id=0).mask.union(origin)
demolition_area = (((mask1_building.union(mask1_farm)).union(mask1_forest)
).union(mask1_shack)).intersection(mask2_rest)
ibuild_area = (((mask1_grass.union(mask1_forest)).union(mask1_road)
).union(mask1_water)).intersection(mask2_building)
demolition_area_geojson = {
'type': 'Feature',
'geometry': demolition_area.geojson,
'properties': {
'type': 'change'
}
}
ibuild_area_geojson = {
'type': 'Feature',
'geometry': ibuild_area.geojson,
'properties': {
'type': 'change'
}
}
return JsonResponse({
"demolition_area": demolition_area_geojson,
"ibuild_area": ibuild_area_geojson
})
