This hack presents a Processing library to help you read and manipulate GPS data in the GPX format. It uses NanoXML/Lite to keep the file size to a minimum, so it doesn't yet support namespaces or extensions. Only basic information (latitude, longitude, elevation and time) is parsed.
A GPX file is an XML file with a collection of GPS Tracks inside. Each GPS Track has a name, and is a collection of GPS Track Segments. Each segment is a collection of GPS Points with latitude and longitude as well as an elevation and timestamp. A GPX file can also contain waypoints, with lat/lon position and name and type. No other information is parsed by this library.
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