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main.go
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main.go
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package main
import (
"encoding/csv"
"flag"
"fmt"
"os"
"strings"
"time"
"github.com/LdDl/ch"
"github.com/LdDl/osm2ch"
"github.com/pkg/errors"
)
var (
tagStr = flag.String("tags", "motorway,primary,primary_link,road,secondary,secondary_link,residential,tertiary,tertiary_link,unclassified,trunk,trunk_link,motorway_link", "Set of needed tags (separated by commas)")
osmFileName = flag.String("file", "my_graph.osm.pbf", "Filename of *.osm.pbf file (it has to be compressed)")
out = flag.String("out", "my_graph.csv", "Filename of 'Comma-Separated Values' (CSV) formatted file. E.g.: if file name is 'map.csv' then 3 files will be produced: 'map.csv' (edges), 'map_vertices.csv', 'map_shortcuts.csv'")
geomFormat = flag.String("geomf", "wkt", "Format of output geometry. Expected values: wkt / geojson")
units = flag.String("units", "km", "Units of output weights. Expected values: km for kilometers / m for meters")
doContraction = flag.Bool("contract", true, "Prepare contraction hierarchies?")
)
func main() {
flag.Parse()
tags := strings.Split(*tagStr, ",")
cfg := osm2ch.OsmConfiguration{
EntityName: "highway", // Currrently we do not support others
Tags: tags,
}
edgeExpandedGraph, err := osm2ch.ImportFromOSMFile(*osmFileName, &cfg)
if err != nil {
fmt.Println(err)
return
}
fnamePart := strings.Split(*out, ".csv") // to guarantee proper filename and its extension
fnameEdges := fmt.Sprintf(fnamePart[0] + ".csv")
fnameVertices := fmt.Sprintf(fnamePart[0] + "_vertices.csv")
fnameShortcuts := fmt.Sprintf(fnamePart[0] + "_shortcuts.csv")
/* Edges file */
fileEdges, err := os.Create(fnameEdges)
if err != nil {
fmt.Println(err)
return
}
defer fileEdges.Close()
writerEdges := csv.NewWriter(fileEdges)
defer writerEdges.Flush()
writerEdges.Comma = ';'
// from_vertex_id - int64, ID of generated source vertex
// to_vertex_id - int64, ID of generated target vertex
// weight - float64, Weight of an edge (meters/kilometers)
// geom - geometry (WKT or GeoJSON representation)
// was_one_way - if edge was one way
// edge_id - int64, ID of generated edge
// osm_way_from - int64, ID of source OSM Way
// osm_way_to - int64, ID of target OSM Way
// osm_way_from_source_node - int64, ID of first OSM Node in source OSM Way
// osm_way_from_target_node - int64, ID of last OSM Node in source OSM Way
// osm_way_to_source_node - int64, ID of first OSM Node in target OSM Way
// osm_way_to_target_node - int64, ID of last OSM Node in target OSM Way
err = writerEdges.Write([]string{"from_vertex_id", "to_vertex_id", "weight", "geom", "was_one_way", "edge_id", "osm_way_from", "osm_way_to", "osm_way_from_source_node", "osm_way_from_target_node", "osm_way_to_source_node", "osm_way_to_target_node"})
if err != nil {
fmt.Println(err)
return
}
/* Vertices file */
fileVertices, err := os.Create(fnameVertices)
if err != nil {
fmt.Println(err)
return
}
defer fileVertices.Close()
writerVertices := csv.NewWriter(fileVertices)
defer writerVertices.Flush()
writerVertices.Comma = ';'
// vertex_id - int64, ID of vertex
// order_pos - int, Position of vertex in hierarchies (evaluted by library)
// importance - int, Importance of vertex in graph (evaluted by library)
// geom - geometry (WKT or GeoJSON representation)
err = writerVertices.Write([]string{"vertex_id", "order_pos", "importance", "geom"})
if err != nil {
fmt.Println(err)
return
}
verticesGeoms := make(map[int64]osm2ch.GeoPoint)
graph := ch.Graph{}
// Prepare graph and write edges
for _, edge := range edgeExpandedGraph {
source := int64(edge.Source)
target := int64(edge.Target)
err := graph.CreateVertex(source)
if err != nil {
err = errors.Wrap(err, "Can not create source vertex")
return
}
err = graph.CreateVertex(target)
if err != nil {
err = errors.Wrap(err, "Can not create source vertex")
return
}
cost := edge.CostMeters
if strings.ToLower(*units) == "m" {
cost *= 1000.0
}
err = graph.AddEdge(source, target, cost)
if err != nil {
err = errors.Wrap(err, "Can not wrap Source and Targed vertices as Edge")
return
}
if len(edge.Geom) < 2 {
fmt.Println("!!")
// Skip bad expanded edges
continue
}
geomStr := ""
if strings.ToLower(*geomFormat) == "geojson" {
geomStr = osm2ch.PrepareGeoJSONLinestring(edge.Geom)
} else {
geomStr = osm2ch.PrepareWKTLinestring(edge.Geom)
}
if _, ok := verticesGeoms[source]; !ok {
verticesGeoms[source] = osm2ch.GeoPoint{Lon: edge.Geom[0].Lon, Lat: edge.Geom[0].Lat}
}
if _, ok := verticesGeoms[target]; !ok {
verticesGeoms[target] = osm2ch.GeoPoint{Lon: edge.Geom[len(edge.Geom)-1].Lon, Lat: edge.Geom[len(edge.Geom)-1].Lat}
}
err = writerEdges.Write([]string{
fmt.Sprintf("%d", source),
fmt.Sprintf("%d", target),
fmt.Sprintf("%f", cost),
geomStr,
fmt.Sprintf("%t", edge.WasOneway),
fmt.Sprintf("%d", edge.ID),
fmt.Sprintf("%d", edge.SourceOSMWayID),
fmt.Sprintf("%d", edge.TargetOSMWayID),
fmt.Sprintf("%d", edge.SourceComponent.SourceNodeID), fmt.Sprintf("%d", edge.SourceComponent.TargetNodeID),
fmt.Sprintf("%d", edge.TargeComponent.SourceNodeID), fmt.Sprintf("%d", edge.TargeComponent.TargetNodeID),
})
if err != nil {
fmt.Println(err)
return
}
}
if *doContraction {
fmt.Println("Starting contraction process....")
st := time.Now()
graph.PrepareContractionHierarchies()
fmt.Printf("Done contraction process in %v\n", time.Since(st))
}
/* Write vertices */
vertices := graph.Vertices
for i := 0; i < len(vertices); i++ {
currentVertexExternal := vertices[i].Label
vertexGeom := verticesGeoms[currentVertexExternal]
geomStr := ""
if strings.ToLower(*geomFormat) == "geojson" {
geomStr = osm2ch.PrepareGeoJSONPoint(vertexGeom)
} else {
geomStr = osm2ch.PrepareWKTPoint(vertexGeom)
}
// Write reference information about vertex
err = writerVertices.Write([]string{
fmt.Sprintf("%d", currentVertexExternal),
fmt.Sprintf("%d", graph.Vertices[i].OrderPos()),
fmt.Sprintf("%d", graph.Vertices[i].Importance()),
fmt.Sprintf("%s", geomStr),
})
if err != nil {
fmt.Println(err)
return
}
}
if *doContraction {
/* Write shortcuts */
// from_vertex_id - int64, ID of source vertex
// to_vertex_id - int64, ID of arget vertex
// weight - float64, Weight of an edge
// via_vertex_id - int64, ID of vertex through which the shortcut exists
err = graph.ExportShortcutsToFile(fnameShortcuts)
if err != nil {
fmt.Println(err)
return
}
}
}