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On 4/15/2015 12:17 AM, César Augusto
Ramírez Franco wrote:
Hello
dear list
I'm using
r.stream.extract to obtain a stream network and further
processing of the vector map (as points using v.to.points) in
R to generate longitudinal stream profiles and calculate the
hypsometric curve, but I need to include the accumulation
value in my points DB.
The issue
I'm having is that if I use r.watershed AFTER v.to.points to
read the raster values into the points, they don't quite match
(i.e. points are not where the max accum values are). I assume
because I'm not calculating the accumulation map the same way
r.stream.extract is calculating it.
What I
want is to obtain the same accumulation map used by
r.stream.extract when none is specified, how can I do this? It
would be nice if r.stream.extract would let me save the
accumulation map it computes for further use.
Why not simplify your procedure to:
r.watershed to create streams and accumulation raster.
r.thin and r.to.rast to extract stream vectors from the r.watershed
output
v.to.point to get points along the streams
v.what.rast to upload accumulation values to the points along
streams
Thanks in
advance.
PS: I'm
using Grass 6.4.3 on Ubuntu 14.04.
--
César
Augusto Ramírez Franco
Laboratorio de Sistemas
Complejos Naturales
Escuela de Geociencias
Facultad
de Ciencias
Universidad Nacional de
Colombia - Sede Medellín
Teléfono: (57-4) 430 9369 - 300 459 6085
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