Wednesday, 8 June 2016

How to automatically plot intermediate contours with QGIS, GRASS GIS or SAGA GIS?


I'm mapping a steep mountain range. My main contour interval is 50 m and my intermediate contour interval is 10 m. In steep areas, the interval of 10 m is too small, so I need to leave of the 10 m-interval and use 20 m or 25 m instead.


Is there a way, to do that automated in QGIS, SAGA GIS or GRASS GIS?



Answer




You could try to make an overlay of your contour lines with the slope grid, and only show certain contour lines depending on the average value of the slope below that contour line.


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