On 29/03/2019 22:03, Adrien André
wrote:
Hello,
following the wiki doc about stream extraction [1], once the
stream layer thinned and vectorized,
there are many small arcs i would like to remove (see attached
capture [2]).
So, with the underlying drainage direction map [3], and the
resolution r, i would like to delete segments
- about r*sqrt(2) long
- whose azimuth is more than 45° different from the pixel value
under its starting point.
This might be possible, but I think the best approach would be to
choose the correct threshold value for r.watershed from the start.
Trying to manually "fiddle" with the stream network will most
likely leave you with disconnected segments, or other
inconsistencies.
But i
still haven't figured a way to achieve this.
Do you have any advice ?
Thank you,
Best regards,
[1]
https://grasswiki.osgeo.org/wiki/Creating_watersheds#Display_first_results
[2] https://framapic.org/1exdxrdqxemw/ytuVxiBp2FKh.png
[3] https://grass.osgeo.org/grass74/manuals/r.watershed.html
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Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
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