tcx2csv.rb

require 'rubygems'
require 'hpricot'
require 'fastercsv'

doc = Hpricot::XML(File.read(ARGV[0]))

csv = FasterCSV.generate do |csv|
  (doc/:Trackpoint).each do |x|
    next unless x.at('HeartRateBpm') && x.at('Position')
    csv << [
      x.at('Time').innerText,
      x.at('Position').at('LatitudeDegrees').innerText,
      x.at('Position').at('LongitudeDegrees').innerText,
      x.at('HeartRateBpm').at('Value').innerText,
      x.at('DistanceMeters').innerText,
      x.at('AltitudeMeters').innerText,
    ]
  end
end