For example - if I have a raster DEM covering a stream with higher elevations in the west (up river) and lower elevations in the east (down river) is it possible to reverse this trend so that the east will have higher elevations? The idea is to essentially reverse the direction of the river.

  • Negating the elevations will reverse the trend, but make the river look like a ridge. If you could disclose more information about the purpose of this exercise, perhaps more effective solutions could be offered.
    – whuber
    Jun 13, 2011 at 17:12
  • I am deriving a river thalweg using the Flow Accumulation/Stream Link tools - along with some raster calculations. The idea is to get the in-flow and out-flow points of my river section from the DEM. The problem is, my thalweg only covers about 3/4 of the rivers' reach. I am hoping that by reversing the trend of the raster I can run the same operations covering the "opposite" 3/4's of the river.
    – Radar
    Jun 13, 2011 at 18:48
  • This is close to what I am looking for, but I think it might be a bit more involved than what I require. I basically want to reverse the trend of a DEM which is sloped (flowing down a river).
    – Radar
    Jun 13, 2011 at 18:50
  • @whuber but what about all that trig? Jun 25, 2011 at 23:33
  • @whuber - I've been a bit gun-shy since reading your response mentioning overuse of trig. How does one know when it's OK to use trig without worrying about appearing trig(ger) happy? Jun 27, 2011 at 13:10


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