On Thu, Sep 27, 2018 at 12:10 PM Shane Carey <[email protected]> wrote:
> > Is there anyway of the algorithm just being able to create a floodlain for > actual real rivers as opposed to the derived river dataset? > Yes, just convert your streams to raster (presence-absence) and a raster for flow direction as I mentioned here: https://lists.osgeo.org/pipermail/grass-user/2018-September/079135.html However, you need to be cautious about fit between the existing streams and the DEM. Definitively check how your existing streams align with the derived ones (where there are both streams). > > On Máirt 25 MFómh 2018 at 15:49, Shane Carey <[email protected]> wrote: > >> Image attached shows rivers (black line) and floodplain of where it >> thinks there are rivers and in some cases where there may not be rivers. >> > To use the derived streams and get rid of parts you don't want, you could buffer the existing streams and preserve only the derived streams which are in that buffer. However, you should really look at why they are different and specifically what is closer to reality.
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