Markus Metz wrote:
r.watershed in 6.5+ can do MFD which reduces these single-cell strings
substantially. I would recommend MFD over SFD for anything with 30m
resolution or higher, not much gained for 90m or coarser. Results are
generally more accurate with MFD for high resolution (= 30m)
Markus Metz wrote:
These single-cell strings in basins, did you get them with SFD or MFD
mode? If MFD mode, what convergence factor did you use?
My watershed delineation was done with r.watershed, not r.terraflow, so
IIUC it's SFD. I didn't see any braided streams in the output.
I'm using
Micha Silver wrote:
Markus Metz wrote:
These single-cell strings in basins, did you get them with SFD or MFD
mode? If MFD mode, what convergence factor did you use?
My watershed delineation was done with r.watershed, not r.terraflow,
so IIUC it's SFD. I didn't see any braided streams in
Markus Metz wrote:
Micha Silver wrote:
Markus Metz wrote:
These single-cell strings in basins, did you get them with SFD or
MFD mode? If MFD mode, what convergence factor did you use?
My watershed delineation was done with r.watershed, not r.terraflow,
so IIUC it's SFD. I didn't see any
Hi Micha,
Make a test. If you run a 3x3 or 5x5 filter and get the percentage, and
after check the values for those isolated pixels, you perceive that when
pixels are isolated the percentage values are very different from its
neighbours. I forgot to give the full suggestion:
1. run r.neighbors
Milton Cezar Ribeiro
wrote:
Hi Micha,
Make a test. If you run a 3x3 or 5x5 filter and get the percentage, and
after check the values for those isolated pixels, you perceive that when
pixels are isolated the percentage values are very different from its
neighbours. I forgot to give the
These single-cell strings in basins, did you get them with SFD or MFD
mode? If MFD mode, what convergence factor did you use?
Markus M
Micha Silver wrote:
Milton Cezar Ribeiro wrote:
Hi Micha,
Make a test. If you run a 3x3 or 5x5 filter and get the percentage, and
after check the values
How can I avoid the problem of strings of single cells when creating
basins with r.watershed? I think this is referred to as ladders.
Here's [1] an image showing what I mean.
In my example, the purple colored catchment has two tails of width 1
cell. One tail separates between the light green
Micha Silver pisze:
How can I avoid the problem of strings of single cells when creating
basins with r.watershed? I think this is referred to as ladders.
Here's [1] an image showing what I mean.
In my example, the purple colored catchment has two tails of width 1
cell. One tail separates
Hi Micha,
May be with *r.neighbors *combined with *interspersion* method you can
solve this.
good luck
milton
brazil=toronto
2009/8/2 Micha Silver mi...@arava.co.il
How can I avoid the problem of strings of single cells when creating basins
with r.watershed? I think this is referred to as
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