def test_srs(self):
"Testing OGR Geometries with Spatial Reference objects."
for mp in self.geometries.multipolygons:
# Creating a geometry w/spatial reference
sr = SpatialReference('WGS84')
mpoly = OGRGeometry(mp.wkt, sr)
self.assertEqual(sr.wkt, mpoly.srs.wkt)
# Ensuring that SRS is propagated to clones.
klone = mpoly.clone()
self.assertEqual(sr.wkt, klone.srs.wkt)
# Ensuring all children geometries (polygons and their rings) all
# return the assigned spatial reference as well.
for poly in mpoly:
self.assertEqual(sr.wkt, poly.srs.wkt)
for ring in poly:
self.assertEqual(sr.wkt, ring.srs.wkt)
# Ensuring SRS propagate in topological ops.
a = OGRGeometry(self.geometries.topology_geoms[0].wkt_a, sr)
b = OGRGeometry(self.geometries.topology_geoms[0].wkt_b, sr)
diff = a.difference(b)
union = a.union(b)
self.assertEqual(sr.wkt, diff.srs.wkt)
self.assertEqual(sr.srid, union.srs.srid)
# Instantiating w/an integer SRID
mpoly = OGRGeometry(mp.wkt, 4326)
self.assertEqual(4326, mpoly.srid)
mpoly.srs = SpatialReference(4269)
self.assertEqual(4269, mpoly.srid)
self.assertEqual('NAD83', mpoly.srs.name)
# Incrementing through the multipolygon after the spatial reference
# has been re-assigned.
for poly in mpoly:
self.assertEqual(mpoly.srs.wkt, poly.srs.wkt)
poly.srs = 32140
for ring in poly:
# Changing each ring in the polygon
self.assertEqual(32140, ring.srs.srid)
self.assertEqual('NAD83 / Texas South Central',
ring.srs.name)
ring.srs = str(SpatialReference(4326)) # back to WGS84
self.assertEqual(4326, ring.srs.srid)
# Using the `srid` property.
ring.srid = 4322
self.assertEqual('WGS 72', ring.srs.name)
self.assertEqual(4322, ring.srid)
# srs/srid may be assigned their own values, even when srs is None.
mpoly = OGRGeometry(mp.wkt, srs=None)
mpoly.srs = mpoly.srs
mpoly.srid = mpoly.srid
def test_srs(self):
"Testing OGR Geometries with Spatial Reference objects."
for mp in self.geometries.multipolygons:
# Creating a geometry w/spatial reference
sr = SpatialReference("WGS84")
mpoly = OGRGeometry(mp.wkt, sr)
self.assertEqual(sr.wkt, mpoly.srs.wkt)
# Ensuring that SRS is propagated to clones.
klone = mpoly.clone()
self.assertEqual(sr.wkt, klone.srs.wkt)
# Ensuring all children geometries (polygons and their rings) all
# return the assigned spatial reference as well.
for poly in mpoly:
self.assertEqual(sr.wkt, poly.srs.wkt)
for ring in poly:
self.assertEqual(sr.wkt, ring.srs.wkt)
# Ensuring SRS propagate in topological ops.
a = OGRGeometry(self.geometries.topology_geoms[0].wkt_a, sr)
b = OGRGeometry(self.geometries.topology_geoms[0].wkt_b, sr)
diff = a.difference(b)
union = a.union(b)
self.assertEqual(sr.wkt, diff.srs.wkt)
self.assertEqual(sr.srid, union.srs.srid)
# Instantiating w/an integer SRID
mpoly = OGRGeometry(mp.wkt, 4326)
self.assertEqual(4326, mpoly.srid)
mpoly.srs = SpatialReference(4269)
self.assertEqual(4269, mpoly.srid)
self.assertEqual("NAD83", mpoly.srs.name)
# Incrementing through the multipolygon after the spatial reference
# has been re-assigned.
for poly in mpoly:
self.assertEqual(mpoly.srs.wkt, poly.srs.wkt)
poly.srs = 32140
for ring in poly:
# Changing each ring in the polygon
self.assertEqual(32140, ring.srs.srid)
self.assertEqual("NAD83 / Texas South Central", ring.srs.name)
ring.srs = str(SpatialReference(4326)) # back to WGS84
self.assertEqual(4326, ring.srs.srid)
# Using the `srid` property.
ring.srid = 4322
self.assertEqual("WGS 72", ring.srs.name)
self.assertEqual(4322, ring.srid)
# srs/srid may be assigned their own values, even when srs is None.
mpoly = OGRGeometry(mp.wkt, srs=None)
mpoly.srs = mpoly.srs
mpoly.srid = mpoly.srid
def extent(self, srid=WEB_MERCATOR_SRID):
"""
Returns bbox for layer.
"""
if not self._bbox or self._bbox_srid != srid:
# Get bbox for raster in original coordinates
meta = self.metadata
xmin = meta.uperleftx
ymax = meta.uperlefty
xmax = xmin + meta.width * meta.scalex
ymin = ymax + meta.height * meta.scaley
# Create Polygon box
geom = OGRGeometry(Envelope((xmin, ymin, xmax, ymax)).wkt)
# Set original srs
if meta.srs_wkt:
geom.srs = SpatialReference(meta.srs_wkt)
else:
geom.srid = meta.srid
# Transform to requested srid
geom.transform(srid)
# Calculate value range for bbox
coords = geom.coords[0]
xvals = [x[0] for x in coords]
yvals = [x[1] for x in coords]
# Set bbox
self._bbox = (min(xvals), min(yvals), max(xvals), max(yvals))
self._bbox_srid = srid
return self._bbox
def extent(self, srid=WEB_MERCATOR_SRID):
"""
Returns bbox for layer.
"""
if not self._bbox or self._bbox_srid != srid:
# Get bbox for raster in original coordinates
meta = self.metadata
xmin = meta.uperleftx
ymax = meta.uperlefty
xmax = xmin + meta.width * meta.scalex
ymin = ymax + meta.height * meta.scaley
# Create Polygon box
geom = OGRGeometry(Envelope((xmin, ymin, xmax, ymax)).wkt)
# Set original srs
if meta.srs_wkt:
geom.srs = SpatialReference(meta.srs_wkt)
else:
geom.srid = meta.srid
# Transform to requested srid
geom.transform(srid)
# Calculate value range for bbox
coords = geom.coords[0]
xvals = [x[0] for x in coords]
yvals = [x[1] for x in coords]
# Set bbox
self._bbox = (min(xvals), min(yvals), max(xvals), max(yvals))
self._bbox_srid = srid
return self._bbox
def convOSM(wkt):
""" Converts standard merkartor
to osm projection as tuple
"""
obj = OGRGeometry(wkt)
obj.srs = 'EPSG:4326'
obj.transform_to(SpatialReference('EPSG:900913'))
#obj.transform_to(SpatialReference('EPSG:4326'))
return (obj.x, obj.y)
def street_location(request):
if request.method == 'GET':
params = request.GET
points = []
if params.has_key('str'):
if params.has_key('int'):
points += (get_locations_by_intersection(params['str'],params['int']))
elif params.has_key('door'):
loc = get_location_by_door(params['str'],params['door'])
if loc:
points.append(loc[0].wkt)
else:
raise Http404
if params.has_key('out'):
out = params['out']
if out == 'layer' and points:
lpoints = []
for p in points:
pgeom = OGRGeometry(p)
pgeom.srs = 'EPSG:4326'
pgeom.transform_to(SpatialReference('EPSG:900913'))
pcoord = simplejson.loads(pgeom.json)
lpoints.append({
"type": "point",
"id": 'point',
"name": "pipin",
"geojson": pcoord,
"icon": {
"url": "/media/icons/info.png",
"width": 32,
"height": 37
}
})
layer = {
'type': 'layer',
'id': 'layer-location',
'elements': lpoints,
'box_size': None
}
return HttpResponse(simplejson.dumps(layer), mimetype='text/json')
else:
raise Http404
else:
path = request.get_full_path() + '&out=layer'
context = RequestContext(request, {'params': params, 'layerpath':path})
return render_to_response('maap/street_location.html', context_instance=context)
else:
raise Http404
else:
raise Http404
def get_extent_from_text(points, srid_in, srid_out):
"""Transform an extent from srid_in to srid_out."""
proj_in = SpatialReference(srid_in)
proj_out = SpatialReference(srid_out)
if srid_out == 900913:
if int(float(points[0])) == -180:
points[0] = -179
if int(float(points[1])) == -90:
points[1] = -89
if int(float(points[2])) == 180:
points[2] = 179
if int(float(points[3])) == 90:
points[3] = 89
wkt = 'POINT(%f %f)' % (float(points[0]), float(points[1]))
wkt2 = 'POINT(%f %f)' % (float(points[2]), float(points[3]))
ogr = OGRGeometry(wkt)
ogr2 = OGRGeometry(wkt2)
if hasattr(ogr, 'srs'):
ogr.srs = proj_in
ogr2.srs = proj_in
else:
ogr.set_srs(proj_in)
ogr2.set_srs(proj_in)
ogr.transform_to(proj_out)
ogr2.transform_to(proj_out)
wkt = ogr.wkt
wkt2 = ogr2.wkt
mins = wkt.replace('POINT (', '').replace(')', '').split(' ')
maxs = wkt2.replace('POINT (', '').replace(')', '').split(' ')
mins.append(maxs[0])
mins.append(maxs[1])
return mins
def get_extent_from_text(points, srid_in, srid_out):
"""Transform an extent from srid_in to srid_out."""
proj_in = SpatialReference(srid_in)
proj_out = SpatialReference(srid_out)
if srid_out == 900913:
if int(float(points[0])) == -180:
points[0] = -179
if int(float(points[1])) == -90:
points[1] = -89
if int(float(points[2])) == 180:
points[2] = 179
if int(float(points[3])) == 90:
points[3] = 89
wkt = 'POINT(%f %f)' % (float(points[0]), float(points[1]))
wkt2 = 'POINT(%f %f)' % (float(points[2]), float(points[3]))
ogr = OGRGeometry(wkt)
ogr2 = OGRGeometry(wkt2)
if hasattr(ogr, 'srs'):
ogr.srs = proj_in
ogr2.srs = proj_in
else:
ogr.set_srs(proj_in)
ogr2.set_srs(proj_in)
ogr.transform_to(proj_out)
ogr2.transform_to(proj_out)
wkt = ogr.wkt
wkt2 = ogr2.wkt
mins = wkt.replace('POINT (', '').replace(')', '').split(' ')
maxs = wkt2.replace('POINT (', '').replace(')', '').split(' ')
mins.append(maxs[0])
mins.append(maxs[1])
return mins
def transform_geom(wkt, srid_in, srid_out):
proj_in = SpatialReference(int(srid_in))
proj_out = SpatialReference(int(srid_out))
ogr = OGRGeometry(wkt)
if hasattr(ogr, 'srs'):
ogr.srs = proj_in
else:
ogr.set_srs(proj_in)
ogr.transform_to(proj_out)
return ogr.wkt
def transform_geom(wkt, srid_in, srid_out):
proj_in = SpatialReference(int(srid_in))
proj_out = SpatialReference(int(srid_out))
ogr = OGRGeometry(wkt)
if hasattr(ogr, 'srs'):
ogr.srs = proj_in
else:
ogr.set_srs(proj_in)
ogr.transform_to(proj_out)
return ogr.wkt
def osm_change_srid(geom, srid):
""" Converts standard merkartor to desired projection """
obj = OGRGeometry(geom.wkt)
obj.srs = OSM_SRID
obj.transform_to(SpatialReference(srid))
return obj.geos
def osm_change_srid(geom, srid):
""" Converts standard merkartor to desired projection """
obj = OGRGeometry(geom.wkt)
obj.srs = OSM_SRID
obj.transform_to(SpatialReference(srid))
return obj.geos
