Module: Vendor::GPXToCSV

Defined in:
lib/vendor/gpx_to_csv.rb

Overview

convert a GPX file to a bespoke tab-separated CSV file

Class Method Summary collapse

Class Method Details

.gpx_to_csv(gpx_file, csv_options = {col_sep: "\t", headers: true, encoding: 'UTF-8', write_headers: true}) ⇒ CSV

Parameters:

  • gpx_file (GPX::GPXFile)
  • csv_options (Hash) (defaults to: {col_sep: "\t", headers: true, encoding: 'UTF-8', write_headers: true})

Returns:

  • (CSV) 


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# File 'lib/vendor/gpx_to_csv.rb', line 7

def self.gpx_to_csv(gpx_file, csv_options = {col_sep: "\t", headers: true, encoding: 'UTF-8', write_headers: true})
  gpx_headers = %w(name geojson start_date end_date minimum_elevation maximum_elevation)

  csv_string = CSV.generate(**csv_options) do |csv|
    csv << gpx_headers
    geo_feature = {'type': 'Feature', 'geometry': '{}'}

    gpx_file.waypoints.each do |waypoint|
      json = {'type': 'Point', 'coordinates': [waypoint.lon, waypoint.lat]}
      geo_feature[:geometry] = json
      csv << [waypoint.name, geo_feature.to_json, nil, nil, waypoint.elevation, nil]
      csv
    end

    gpx_file.routes.each do |route|
      start_time = route.points.first.time
      end_time = route.points.last.time
      coordinates = []

      route.points.each do |point|
        coordinates << [point.lon, point.lat]
      end

      json = {'type': 'LineString', 'coordinates': coordinates}
      geo_feature[:geometry] = json

      csv << [
        route.name,
        geo_feature.to_json,
        start_time,
        end_time,
        min_elev,
        max_elev
      ]
    end

    gpx_file.tracks.each do |track|
      start_time = track.points.first.time
      end_time = track.points.last.time
      coordinates = []

      min_elev = nil
      max_elev = nil

      track.points.each do |point|
        if point.elevation
          min_elev = point.elevation if min_elev.nil? || point.elevation < min_elev

          if min_elev && min_elev != point.elevation
            max_elev ||= 0
            max_elev = point.elevation if max_elev < point.elevation
          end
        end

        coordinates << [point.lon, point.lat]

      end
      json = {'type': 'LineString', 'coordinates': coordinates}
      geo_feature[:geometry] = json

      csv << [track.name,
              geo_feature.to_json,
              start_time,
              end_time,
              min_elev,
              max_elev]
    end
  end
  csv = CSV.parse(csv_string, **csv_options)
  csv
end