I have a raster layer for a natural canal that I want to rum a hydraulic model on, so I want to prolongate -extend- the edges about 20 meters while keeping the same profile of the edges.

image from hydro-informatics.com

  • What have you tried so far? Have you tried Buffer? May 24 at 2:00
  • 2
    I don't understand the title of the question. What DEM do you want to edit?
    – user30184
    May 24 at 5:18
  • If you see the picture, I have a digital elevation model shaped like the letter S, I want to extend it on both sides 20 meters each, those extentions will have the same profile as the last point in this DEM May 24 at 7:05
  • What is a DEM, in your understanding? I can't see a DEM, I see a vector layer. A DEM is a raster layer with elevation information. You can't "extend" a raster layer, as you would need additional data. You can "extend" (add a buffer) to a vector layer. Please edit/revise your question. As it is written now, it doesn't make any sense.
    – Babel
    May 24 at 7:32
  • Sorry, so behind this vector layer, there is a raster (.tif) layer has the elevations of my canal. I want to extend this .tif raster layer 20 meters on both sides, while keeping the same profile of the edges May 24 at 7:51


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