merger.rb

#!/usr/bin/env ruby

# Small script to join and clean-up ACA gpx files.
# Setup:
# - make sure you got nokogiri installed (gem install nokogiri)
# - throw this merger.rb in some directory
# - inside that directory create input/ folder
# - copy ACA .gpx files into that folder. Generally {direction}Main files plus Services files
# Usage:
# - from terminal run ./merger.rb
# - output.gpx will be created in the directory where this script is at
# - now you can import it into Google maps

require 'nokogiri'

point_data  = Hash.new { |hash, key| hash[key] = [] }
wp_data     = Hash.new { |hash, key| hash[key] = [] }

Dir[File.join(File.dirname(__FILE__), 'input', '**', "*.gpx")].each do |file|
  puts file.inspect
  doc = File.open(file){|f| Nokogiri::XML(f)}
  points = doc.css('trkpt')
  points.each do |point|
    point_data[File.basename(file)] << [point['lat'], point['lon']]
  end

  waypoints = doc.css('wpt')
  waypoints.each do |wp|
    # Ignoring all Waypoints except campgrounds
    if wp.css('sym').text == 'Campground'
      wp_data[File.basename(file)] << [wp['lat'], wp['lon'], wp.css('name').text]
    end
  end
end

builder = Nokogiri::XML::Builder.new do |xml|
  xml.gpx(
    :creator              => 'merger.rb',
    :version              => "0.0",
    :xmlns                => "http://www.topografix.com/GPX/1/1",
    'xmlns:xsi'           => "http://www.w3.org/2001/XMLSchema-instance",
    'xsi:schemaLocation'  => "http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd"
  ) do
    point_data.each do |segment, points|
      xml.trk do
        xml.name segment
        xml.trkseg do
          points.each do |lat, lon|
            xml.trkpt(:lat => lat, :lon => lon)
          end
        end
      end
    end

    wp_data.each do |segment, waypoints|
      waypoints.each do |lat, lon, name|
        xml.wpt(:lat => lat, :lon => lon) do
          xml.name name
        end
      end
    end
  end
end

File.open(File.join(File.dirname(__FILE__), 'output.gpx'), 'w'){|file| file.write(builder.to_xml)}

puts 'Done!'