def __init__(self, osmfile):
# parse the input file and save its contents in memory
# initialize street network
self.street_network = StreetNetwork()
# coord pairs as returned from imposm
self.coords = dict()
# max and min latitude and longitude
self.bounds = dict()
self.bounds["min_lat"] = 9999
self.bounds["max_lat"] = -9999
self.bounds["min_lon"] = 9999
self.bounds["max_lon"] = -9999
# active copy of OSM data indexed by OSM id
self.all_osm_relations = dict()
self.all_osm_ways = dict()
self.all_osm_nodes = dict()
# nodes with specific landuse tags
self.residential_nodes = set()
self.industrial_nodes = set()
self.commercial_nodes = set()
# subset that is also connected to the street network
self.connected_residential_nodes = set()
self.connected_industrial_nodes = set()
self.connected_commercial_nodes = set()
# mapping from highway types to max speeds
# we do this so there"s always a speed limit for every edge, even if
# none is in the OSM data
self.max_speed_map = dict()
self.max_speed_map["motorway"] = 140
self.max_speed_map["trunk"] = 120
self.max_speed_map["primary"] = 100
self.max_speed_map["secondary"] = 80
self.max_speed_map["tertiary"] = 70
self.max_speed_map["road"] = 50
self.max_speed_map["minor"] = 50
self.max_speed_map["unclassified"] = 50
self.max_speed_map["residential"] = 30
self.max_speed_map["track"] = 30
self.max_speed_map["service"] = 20
self.max_speed_map["path"] = 10
self.max_speed_map["cycleway"] = 1 # >0 to prevent infinite weights
self.max_speed_map["bridleway"] = 1 # >0 to prevent infinite weights
self.max_speed_map["pedestrian"] = 1 # >0 to prevent infinite weights
self.max_speed_map["footway"] = 1 # >0 to prevent infinite weights
p = OSMParser(concurrency = 1,
coords_callback = self.coords_callback,
nodes_callback = self.nodes_callback,
ways_callback = self.ways_callback,
relations_callback = self.relations_callback)
p.parse(osmfile)
potential_speed = sqrt(settings["braking_deceleration"] *
available_braking_distance * 2) # m/s
# cars respect speed limit
actual_speed = min(max_speed, potential_speed * 3.6) # km/h
return actual_speed
if __name__ == "__main__":
def out(*output):
for o in output:
print o,
print ''
street_network = StreetNetwork()
street_network.add_node(1, 0, 0)
street_network.add_node(2, 0, 0)
street_network.add_node(3, 0, 0)
street_network.add_street((
1,
2,
), 10, 50)
street_network.add_street((
2,
3,
), 100, 140)
trips = dict()
trips[1] = [3]