Contour Map Creator 0.301improvement 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 and upon success the button draw contours. 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. If you want to clear the map click the button clear map

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.

Created by Christoph Hofstetter (christophhofstetter (at) August 2013 V0.3


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

Number of sample points

North-South axis:
West-East axis:

Elevation Data


Save Data

Copy text and save somewhere

Load Data

Paste data here and click

Version History

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: