Resize/colorize data points on a map

This is a special version of the GPS Visualizer map input form that's designed for plotting quantifiable data on a map. You can colorize and/or resize the points according to a generic frequency field named "N", or you can use a more typical field, such as altitude, population, or category.

If you have TRACK data, or if you DON'T need to automatically colorize/resize your data points by a particular parameter, you'll probably be better served by the normal Leaflet/Google Maps form, the Google Earth KML form, or the JPEG/PNG/SVG form. If you want your map to load markers dynamically (e.g., from a Google Docs spreadsheet), you definitely need to use the standard HTML map form.

The coordinates of your data can be given as latitude/longitude, as geographic places (city-state pairs, states, or countries), U.S. ZIP codes, or Canadian postal codes. For instance, if you wanted to see how many people in each ZIP code responsed to a survey you sent out, this would be a minimal valid .csv file: zip,N [new line] 97202,12 [new line] 97205,5 [new line] 97209,20. If you have a raw list of locations such as ZIP codes (i.e., some ZIPs appear more often in the list than others) and you haven't calculated the frequencies yet, you can set the "Calculate frequency" option to "auto," and GPS Visualizer will create an "N" (frequency) column for you.

Please contact Adam Schneider, using the address on the bottom of this page, if you have any questions about how this form works!