Convert GPX to GeoJSON. GPXをGeoJsonに変換する。

gpx2geojson.md

Convert GPX to GeoJSON

By running

ruby gpx2geojson.rb test.gpx

test.csv will be created. Then use mapbox/csv2geojson to make .geojson file.

npm install -g csv2geojson
csv2geojson test.csv > test.geojson

test.csv is like this:

lat, lon
35.721219, 139.766585
35.721155, 139.766634
35.721209, 139.766607
35.721176, 139.766655
35.721225, 139.766655
35.721268, 139.766623
35.72131, 139.76658

GeoJSON file like this will be created.

gpx2geojson.rb

#!/usr/bin/ruby
# -*- coding: utf-8 -*-
require "rexml/document"
 
in_file_name = ARGV[0]
out_file_name = in_file_name.gsub(".gpx", ".csv")

fout = File.open(out_file_name, "w")
fout.puts "lat, lon" 
doc = nil
File.open(in_file_name) {|xmlfile|
  doc = REXML::Document.new(xmlfile)
}
 
trkseg = doc.elements["/gpx/trk/trkseg"]
trkseg.elements.each("trkpt"){|trkpt|
  longtitude = trkpt.attributes.get_attribute("lon")
  latitude = trkpt.attributes.get_attribute("lat")
  fout.puts "#{latitude}, #{longtitude}"
} 

fout.close