Instructions

Go to the desired location in the map, set two markers by clicking the map to define a rectangle (or enter coordinates manually). Click the button [get data]. Optionally you can change the number of elevation samples you want in each direction, the more the better. However, if you go beyond 2500 total samples per day, querying data may stop working according to the Google Elevation API description. You can also change the number of contours or set custom contour values. You can save some data in cookies, however there is a limit. Use the manual saving text areas below alternatively.

This script was developed with the Firefox browser and may not work in other browsers. No warranty whatsoever is given, including but not limited to functioning or correctness.

Resources: This script uses the Google Elevation API, Google Maps, jQuery and the CONREC contouring algorithm by Paul Bourke and Jason Davies.

Created by Christoph Hofstetter (christophhofstetter (at) gmail.com) September 2013 v0.311

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