Note: This is purely for educational purposes only and there is no warranty for the validity of information. Hopefully there is someone out there who will refine the code for the community to utilise the technology effectively.
Data use: http://sentinel.ga.gov.au/GPX/hs00to12.gpx ; 16 Feb 2009 16:38 Sydney Time
Resources:
http://jeffreybarke.net/2008/07/density-map-tutorial/
http://sentinel.ga.gov.au/acres/sentinel/gpx_data.shtml