1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 | #!/usr/bin/python2.4 # # Copyright 2007 Google Inc. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """A utility program to help add shapes to an existing GTFS feed. Requires the ogr python package. """ __author__ = 'chris.harrelson.code@gmail.com (Chris Harrelson)' import csv import glob import ogr import os import shutil import sys import tempfile import transitfeed from transitfeed import shapelib from transitfeed import util import zipfile class ShapeImporterError(Exception): pass def PrintColumns(shapefile): """ Print the columns of layer 0 of the shapefile to the screen. """ ds = ogr.Open(shapefile) layer = ds.GetLayer(0) if len(layer) == 0: raise ShapeImporterError("Layer 0 has no elements!") feature = layer.GetFeature(0) print "%d features" % feature.GetFieldCount() for j in range(0, feature.GetFieldCount()): print '--' + feature.GetFieldDefnRef(j).GetName() + \ ': ' + feature.GetFieldAsString(j) def AddShapefile(shapefile, graph, key_cols): """ Adds shapes found in the given shape filename to the given polyline graph object. """ ds = ogr.Open(shapefile) layer = ds.GetLayer(0) for i in range(0, len(layer)): feature = layer.GetFeature(i) geometry = feature.GetGeometryRef() if key_cols: key_list = [] for col in key_cols: key_list.append(str(feature.GetField(col))) shape_id = '-'.join(key_list) else: shape_id = '%s-%d' % (shapefile, i) poly = shapelib.Poly(name=shape_id) for j in range(0, geometry.GetPointCount()): (lat, lng) = (round(geometry.GetY(j), 15), round(geometry.GetX(j), 15)) poly.AddPoint(shapelib.Point.FromLatLng(lat, lng)) graph.AddPoly(poly) return graph def GetMatchingShape(pattern_poly, trip, matches, max_distance, verbosity=0): """ Tries to find a matching shape for the given pattern Poly object, trip, and set of possibly matching Polys from which to choose a match. """ if len(matches) == 0: print ('No matching shape found within max-distance %d for trip %s ' % (max_distance, trip.trip_id)) return None if verbosity >= 1: for match in matches: print "match: size %d" % match.GetNumPoints() scores = [(pattern_poly.GreedyPolyMatchDist(match), match) for match in matches] scores.sort() if scores[0][0] > max_distance: print ('No matching shape found within max-distance %d for trip %s ' '(min score was %f)' % (max_distance, trip.trip_id, scores[0][0])) return None return scores[0][1] def AddExtraShapes(extra_shapes_txt, graph): """ Add extra shapes into our input set by parsing them out of a GTFS-formatted shapes.txt file. Useful for manually adding lines to a shape file, since it's a pain to edit .shp files. """ print "Adding extra shapes from %s" % extra_shapes_txt try: tmpdir = tempfile.mkdtemp() shutil.copy(extra_shapes_txt, os.path.join(tmpdir, 'shapes.txt')) loader = transitfeed.ShapeLoader(tmpdir) schedule = loader.Load() for shape in schedule.GetShapeList(): print "Adding extra shape: %s" % shape.shape_id graph.AddPoly(ShapeToPoly(shape)) finally: if tmpdir: shutil.rmtree(tmpdir) # Note: this method lives here to avoid cross-dependencies between # shapelib and transitfeed. def ShapeToPoly(shape): poly = shapelib.Poly(name=shape.shape_id) for lat, lng, distance in shape.points: point = shapelib.Point.FromLatLng(round(lat, 15), round(lng, 15)) poly.AddPoint(point) return poly def ValidateArgs(options_parser, options, args): if not (args and options.source_gtfs and options.dest_gtfs): options_parser.error("You must specify a source and dest GTFS file, " "and at least one source shapefile") def DefineOptions(): usage = \ """%prog [options] --source_gtfs=<input GTFS.zip> --dest_gtfs=<output GTFS.zip>\ <input.shp> [<input.shp>...] Try to match shapes in one or more SHP files to trips in a GTFS file.""" options_parser = util.OptionParserLongError( usage=usage, version='%prog '+transitfeed.__version__) options_parser.add_option("--print_columns", action="store_true", default=False, dest="print_columns", help="Print column names in shapefile DBF and exit") options_parser.add_option("--keycols", default="", dest="keycols", help="Comma-separated list of the column names used" "to index shape ids") options_parser.add_option("--max_distance", type="int", default=150, dest="max_distance", help="Max distance from a shape to which to match") options_parser.add_option("--source_gtfs", default="", dest="source_gtfs", metavar="FILE", help="Read input GTFS from FILE") options_parser.add_option("--dest_gtfs", default="", dest="dest_gtfs", metavar="FILE", help="Write output GTFS with shapes to FILE") options_parser.add_option("--extra_shapes", default="", dest="extra_shapes", metavar="FILE", help="Extra shapes.txt (CSV) formatted file") options_parser.add_option("--verbosity", type="int", default=0, dest="verbosity", help="Verbosity level. Higher is more verbose") return options_parser def main(key_cols): print 'Parsing shapefile(s)...' graph = shapelib.PolyGraph() for arg in args: print ' ' + arg AddShapefile(arg, graph, key_cols) if options.extra_shapes: AddExtraShapes(options.extra_shapes, graph) print 'Loading GTFS from %s...' % options.source_gtfs schedule = transitfeed.Loader(options.source_gtfs).Load() shape_count = 0 pattern_count = 0 verbosity = options.verbosity print 'Matching shapes to trips...' for route in schedule.GetRouteList(): print 'Processing route', route.route_short_name patterns = route.GetPatternIdTripDict() for pattern_id, trips in patterns.iteritems(): pattern_count += 1 pattern = trips[0].GetPattern() poly_points = [shapelib.Point.FromLatLng(p.stop_lat, p.stop_lon) for p in pattern] if verbosity >= 2: print "\npattern %d, %d points:" % (pattern_id, len(poly_points)) for i, (stop, point) in enumerate(zip(pattern, poly_points)): print "Stop %d '%s': %s" % (i + 1, stop.stop_name, point.ToLatLng()) # First, try to find polys that run all the way from # the start of the trip to the end. matches = graph.FindMatchingPolys(poly_points[0], poly_points[-1], options.max_distance) if not matches: # Try to find a path through the graph, joining # multiple edges to find a path that covers all the # points in the trip. Some shape files are structured # this way, with a polyline for each segment between # stations instead of a polyline covering an entire line. shortest_path = graph.FindShortestMultiPointPath(poly_points, options.max_distance, verbosity=verbosity) if shortest_path: matches = [shortest_path] else: matches = [] pattern_poly = shapelib.Poly(poly_points) shape_match = GetMatchingShape(pattern_poly, trips[0], matches, options.max_distance, verbosity=verbosity) if shape_match: shape_count += 1 # Rename shape for readability. shape_match = shapelib.Poly(points=shape_match.GetPoints(), name="shape_%d" % shape_count) for trip in trips: try: shape = schedule.GetShape(shape_match.GetName()) except KeyError: shape = transitfeed.Shape(shape_match.GetName()) for point in shape_match.GetPoints(): (lat, lng) = point.ToLatLng() shape.AddPoint(lat, lng) schedule.AddShapeObject(shape) trip.shape_id = shape.shape_id print "Matched %d shapes out of %d patterns" % (shape_count, pattern_count) schedule.WriteGoogleTransitFeed(options.dest_gtfs) if __name__ == '__main__': # Import psyco if available for better performance. try: import psyco psyco.full() except ImportError: pass options_parser = DefineOptions() (options, args) = options_parser.parse_args() ValidateArgs(options_parser, options, args) if options.print_columns: for arg in args: PrintColumns(arg) sys.exit(0) key_cols = options.keycols.split(',') main(key_cols) |