GIS (Geographic Information Systems)
An Introduction to Geographic Information Systems, with ArcGIS Tutorials and Resources
How to Read an Election Map
Crowdsourced sites
- BikeMaps.org
From the 'About' page:
At BikeMaps we love biking as much as we love maps! Our goal is to map your cycling experience to make biking safer. You know your local cycling trouble spots and we want you to map them. Your knowledge of cycling safety, hazards, and even bike thefts will be analyzed using GIS and statistics to identify hot spots of cycling safety, risk, and crime. We are constantly updating our maps and technology, so send us feedback. And stay tuned for updated safety maps generated from YOUR biking experience.