Contour Map Creator 0.304improvement ideas
North West corner
Latitude: Longitude:
South East corner
Latitude: Longitude:
Sampling Poinst:
N-S axis: step size: W-E axis: step size:
Plot Options
Save/Load Cookie
Other Options


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 v0.304

Elevation Data


Save Data

Copy data and save somewhere

Load Data

Paste data back here and click button below

Version History

0.304- added searching
- modified layout
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:

Save Contour Map as an SVG file

If you want to make overlays and have the contour maps as an individual layer you can copy the code below the image below and save it as an svg file. Please note, as for now, the map below is square and you may want to stretch it to cover the actual area in a map.