303 lines
10 KiB
Python
303 lines
10 KiB
Python
import fiona
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import geohash
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import os
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import rtree
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import ujson as json
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from collections import OrderedDict, defaultdict
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from shapely.geometry import Point, Polygon, MultiPolygon
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from shapely.prepared import prep
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from shapely.geometry.geo import mapping
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from geodata.polygons.area import polygon_bounding_box_area
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DEFAULT_POLYS_FILENAME = 'polygons.geojson'
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class PolygonIndex(object):
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include_only_properties = None
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simplify_tolerance = 0.0001
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preserve_topology = True
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INDEX_FILENAME = None
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def __init__(self, index=None, polygons=None, save_dir=None,
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index_filename=None,
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include_only_properties=None):
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if save_dir:
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self.save_dir = save_dir
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else:
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self.save_dir = None
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if index_filename:
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self.index_path = os.path.join(save_dir or '.', index_filename)
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else:
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self.index_path = None
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if not index and self.index_path:
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self.create_index(self.index_path, overwrite=True)
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elif not index:
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self.create_index()
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else:
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self.index = index
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if include_only_properties and hasattr(include_only_properties, '__contains__'):
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self.include_only_properties = include_only_properties
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if not polygons:
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self.polygons = []
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else:
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self.polygons = polygons
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self.i = 0
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def create_index(self, index_path=None, overwrite=False):
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raise NotImplementedError('Children must implement')
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def index_polygon(self, polygon):
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raise NotImplementedError('Children must implement')
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def simplify_polygon(self, poly, simplify_tolerance=None, preserve_topology=None):
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if simplify_tolerance is None:
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simplify_tolerance = self.simplify_tolerance
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if preserve_topology is None:
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preserve_topology = self.preserve_topology
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return poly.simplify(simplify_tolerance, preserve_topology=preserve_topology)
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def add_polygon(self, poly, properties, include_only_properties=None):
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if include_only_properties is not None:
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properties = {k: v for k, v in properties.iteritems() if k in include_only_properties}
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self.polygons.append((properties, prep(poly)))
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self.i += 1
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@classmethod
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def create_from_shapefiles(cls, inputs, output_dir,
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index_filename=None,
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polys_filename=DEFAULT_POLYS_FILENAME,
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include_only_properties=None):
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index = cls(save_dir=output_dir, index_filename=index_filename or cls.INDEX_FILENAME)
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for input_file in inputs:
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if include_only_properties is not None:
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include_props = include_only_properties.get(input_file, cls.include_only_properties)
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else:
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include_props = cls.include_only_properties
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f = fiona.open(input_file)
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index.add_geojson_like_file(f)
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return index
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@classmethod
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def fix_polygon(cls, poly):
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'''
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Coerce to valid polygon
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'''
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if not poly.is_valid:
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poly = poly.buffer(0)
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if not poly.is_valid:
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return None
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return poly
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@classmethod
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def to_polygon(cls, coords):
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'''
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Create shapely polygon from list of coordinate tuples if valid
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'''
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if not coords or len(coords) < 3:
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return None
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poly = Polygon(coords)
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return cls.fix_polygon(poly)
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def add_geojson_like_record(self, rec, include_only_properties=None):
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if not rec or not rec.get('geometry') or 'type' not in rec['geometry']:
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return
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poly_type = rec['geometry']['type']
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if poly_type == 'Polygon':
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coords = rec['geometry']['coordinates'][0]
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poly = self.to_polygon(coords)
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if poly is None or not poly.bounds or len(poly.bounds) != 4:
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return
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self.index_polygon(poly)
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self.add_polygon(poly, rec['properties'], include_only_properties=include_only_properties)
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elif poly_type == 'MultiPolygon':
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polys = []
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poly_coords = rec['geometry']['coordinates']
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for coords in poly_coords:
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poly = self.to_polygon(coords[0])
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if poly is None or not poly.bounds or len(poly.bounds) != 4:
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continue
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polys.append(poly)
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self.index_polygon(poly)
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self.add_polygon(MultiPolygon(polys), rec['properties'], include_only_properties=include_only_properties)
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else:
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return
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def add_geojson_like_file(self, f, include_only_properties=None):
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'''
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Add either GeoJSON or a shapefile record to the index
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'''
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for rec in f:
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self.add_geojson_like_record(rec, include_only_properties=include_only_properties)
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@classmethod
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def create_from_geojson_files(cls, inputs, output_dir,
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index_filename=None,
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polys_filename=DEFAULT_POLYS_FILENAME,
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include_only_properties=None):
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index = cls(save_dir=output_dir, index_filename=index_filename or cls.INDEX_FILENAME)
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for input_file in inputs:
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if include_only_properties is not None:
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include_props = include_only_properties.get(input_file, cls.include_only_properties)
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else:
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include_props = cls.include_only_properties
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f = json.load(open(input_file))
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index.add_geojson_like_file(f['features'], include_only_properties=include_props)
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return index
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def save(self, polys_filename=DEFAULT_POLYS_FILENAME):
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self.save_polygons(os.path.join(self.save_dir, polys_filename))
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self.save_index(index_filename=self.index_path)
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def save_polygons(self, out_filename):
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out = open(out_filename, 'w')
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for props, poly in self.polygons:
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feature = {
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'type': 'Feature',
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'geometry': mapping(poly.context),
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'properties': props
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}
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out.write(json.dumps(feature) + u'\n')
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def save_index(self):
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raise NotImplementedError('Children must implement')
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@classmethod
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def load_polygons(cls, filename):
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f = open(filename)
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polygons = []
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for line in f:
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feature = json.loads(line.rstrip())
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poly_type = feature['geometry']['type']
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if poly_type == 'Polygon':
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poly = Polygon(feature['geometry']['coordinates'][0])
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polygons.append((feature['properties'], prep(poly)))
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elif poly_type == 'MultiPolygon':
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polys = []
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for coords in feature['geometry']['coordinates']:
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poly = Polygon(coords[0])
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polys.append(poly)
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polygons.append((feature['properties'], prep(MultiPolygon(polys))))
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return polygons
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@classmethod
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def load_index(cls, d, index_name=None):
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raise NotImplementedError('Children must implement')
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@classmethod
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def load(cls, d, index_name=None, polys_filename=DEFAULT_POLYS_FILENAME):
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index = cls.load_index(d, index_name=index_name or cls.INDEX_FILENAME)
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polys = cls.load_polygons(os.path.join(d, polys_filename))
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return cls(index=index, polygons=polys, save_dir=d)
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def get_candidate_polygons(self, lat, lon):
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raise NotImplementedError('Children must implement')
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def point_in_poly(self, lat, lon, return_all=False):
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polys = self.get_candidate_polygons(lat, lon)
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pt = Point(lon, lat)
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containing = None
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if return_all:
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containing = []
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for i in polys:
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props, poly = self.polygons[i]
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contains = poly.contains(pt)
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if contains and not return_all:
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return props
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elif contains:
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containing.append(props)
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return containing
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class RTreePolygonIndex(PolygonIndex):
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INDEX_FILENAME = 'index.rtree'
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def create_index(self, index_path=None, overwrite=False):
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if index_path:
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self.index = rtree.index.Index(index_path, overwrite=overwrite)
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else:
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self.index = rtree.index.Index()
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def index_polygon(self, polygon):
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self.index.insert(self.i, polygon.bounds)
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def get_candidate_polygons(self, lat, lon):
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return OrderedDict.fromkeys(self.index.intersection((lon, lat, lon, lat))).keys()
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def save_index(self):
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# need to close index before loading it
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self.index.close()
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@classmethod
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def load_index(cls, d, index_name=None):
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return rtree.index.Index(os.path.join(d, index_name or cls.INDEX_FILENAME))
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class GeohashPolygonIndex(PolygonIndex):
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# Reference: https://www.elastic.co/guide/en/elasticsearch/guide/current/geohashes.html
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GEOHASH_PRECISIONS = [
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(7, 152.8 ** 2),
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(6, 1200.0 * 610.0),
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(5, 4900.0 * 4900.0),
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(4, 39000.0 * 19500.0),
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(3, 156000.0 * 156000.0),
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(2, 1251000.0 * 625000.0),
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]
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INDEX_FILENAME = 'index.json'
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def create_index(self, index_path=None, overwrite=False):
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self.index = defaultdict(list)
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def index_point(self, lat, lon, geohash_level):
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code = geohash.encode(lat, lon)[:geohash_level]
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for key in [code] + geohash.neighbors(code):
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self.index[key].append(self.i)
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def index_polygon(self, polygon):
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poly_area = polygon_bounding_box_area(polygon)
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for geohash_level, area in self.GEOHASH_PRECISIONS:
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if area * 9.0 >= poly_area:
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break
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bbox = polygon.bounds
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lat, lon = (bbox[1] + bbox[3]) / 2.0, (bbox[0] + bbox[2]) / 2.0
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self.index_point(lat, lon, geohash_level)
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def get_candidate_polygons(self, lat, lon, all_levels=False):
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candidates = []
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code = geohash.encode(lat, lon)
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for level, area in self.GEOHASH_PRECISIONS:
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indices = self.index.get(code[:level])
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if not indices:
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continue
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candidates.extend(indices)
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if not all_levels:
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break
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return candidates
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def save_index(self):
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json.dump(self.index, open(self.index_path, 'w'))
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@classmethod
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def load_index(cls, d, index_name=None):
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return json.load(open(os.path.join(d, index_name or cls.INDEX_FILENAME)))
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