def from_geojson(self, geojson_data, id_field=None, update=False):
"""
Import geojson raw data in a layer
Args:
geojson_data(str): must be raw text json data
"""
geojson = json.loads(geojson_data)
projection = geojson.get('crs', {}).get('properties',
{}).get('name', None)
if projection and not self.is_projection_allowed(projection):
raise GEOSException(f'GeoJSON projection {projection} must be in '
f'{ACCEPTED_PROJECTIONS}')
if update:
self.features.all().delete()
for feature in geojson.get('features', []):
properties = feature.get('properties', {})
identifier = properties.get(id_field, uuid.uuid4())
self.features.update_or_create(
layer=self,
identifier=identifier,
defaults={
'properties': properties,
'geom': GEOSGeometry(json.dumps(feature.get('geometry'))),
})
def __init__(self, type_input):
"Figure out the correct OGR Type based upon the input."
if isinstance(type_input, OGRGeomType):
num = type_input.num
elif isinstance(type_input, str):
type_input = type_input.lower()
if type_input == 'geometry':
type_input = 'unknown'
num = self._str_types.get(type_input)
if num is None:
raise GEOSException('Invalid OGR String Type "%s"' % type_input)
elif isinstance(type_input, int):
if type_input not in self._types:
raise GEOSException('Invalid OGR Integer Type: %d' % type_input)
num = type_input
else:
raise TypeError('Invalid OGR input type given.')
# Setting the OGR geometry type number.
self.num = num
def _fiona_shape_projection(self, shapefile):
""" Return projection in EPSG format or raw Proj format extracted from
shape
"""
proj = shapefile.crs
if not proj:
raise GEOSException('Your shapefile does not have projection')
if len(proj) == 1 or (len(proj) == 2 and proj.get('no_defs') is True):
return proj.get('init')
else:
return fiona.crs.to_string(proj)