Contour Map Creator 0.303improvement ideas


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) August 2013 V0.303


North West corner
Latitude: Longitude:
South East corner
Latitude: Longitude:

Number of sample points

North-South axis: step size:
West-East axis: step size:

Elevation Data


Save Data

Copy data and save somewhere

Load Data

Paste data back here and click button below

Delete Cookies

Version History

0.303- added plotting of sample points19.08.2013
0.302- added saving in cookie19.08.2013
0.301- added feature request link
- added interval mode for contours added interval mode for contours
- added manual map export/import

Area to double check the requests that were sent: