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What does xyz mean?
Open Trip Planner (aka, this project)
National Elevation Dataset
http://ned.usgs.gov/
Used to grab the elevation of GPS coordinates for the United States.
Necessary because consumer GPS are not good at collecting accurate elevation readings.
Open Street Map
http://www.openstreetmap.org/
Project to create free, editable maps of the world
Data is available under Creative Commons (CC-BY-SA)
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