Parse a Google Timeline KML file and convert to geoJSON in order to visualize directly on GitHub.

timeline_kml_to_geojson.rb

#!/usr/local/bin/ruby
# Scipt for parsing Google Timeline files to geoJSON

require 'time'
require 'json'
require 'nokogiri'

# To prevent encoding errors on OSX
if RUBY_VERSION =~ /2.*.*/
  Encoding.default_external = Encoding::UTF_8
  Encoding.default_internal = Encoding::UTF_8
end

# Read from the Google Timeline file and create geoJSON
f = File.open("#{ARGV[0]}")
basename = File.basename(f, ".kml")
kmldoc = Nokogiri::XML(f) 

geo = {}
geo[:type] = "FeatureCollection"
geo[:features] = []
kmldoc.xpath('//xmlns:Placemark').each do |place|
  if place.css('gx|coord')[1] != nil
    array = {"type" => "Feature", :geometry => {:type => "LineString", :coordinates => []}, "properties" => {"stroke-width" => 4}}
    pairs = place.css('gx|coord')
    place.css('gx|coord').each do |lox|
      lon, lat, zero = lox.text.split(/\s/)
      array[:geometry][:coordinates].push([lon.to_f,lat.to_f, zero.to_f])
    end
  else
    array = {"type" => "Feature", :geometry => {:type => "Point", :coordinates => []}, :properties => {:name => "", :arrived => "", :left => ""}}
    location = place.css('name').text
    sTime = place.css('begin').text
    eTime = place.css('end').text
    array[:properties][:arrived] = Time.parse(sTime).localtime.strftime("%I:%M%p")
    array[:properties][:left] = Time.parse(eTime).localtime.strftime("%I:%M%p")
    coord = place.css('gx|coord').first.text
    lon, lat, zero = coord.split(/\s/)
    array[:geometry][:coordinates] = lon.to_f,lat.to_f
    array[:properties][:name] = location
  end
  (geo[:features] ||= []) << array
end

output = JSON.pretty_generate(geo)
out_file = File.new("/path/to/file/#{basename}.geojson", "w+")
out_file.puts(output)
out_file.close