Last week we featured a tool for drawing contours which uses the Mapzen altitude API. We used a very simple algorithm called ‘Marching Squares’ that we found on Wikipedia. However, as GEB reader Боби ...

Topographic maps, also called contour maps, topo maps or topo quads, are maps that show topography, or land contours, by means of contour lines. Contour lines are curves that connect contiguous points ...

Last week we had a look at drawing contour lines using the Google Maps Elevation API. Because of restrictions on what you are allowed to do with Google’s elevation data, we chose not to create KML ...