Hello Irantzu,
As I said, for anyone to be able to help, please post the exact commands
used (all from the beginning, not just the last one which fails) and
GRASS version and operating system, just like Markus did in his post. If
you are using GUI tools, there is the copy button in the command
dialogs, that will allow you to paste the command parameters to e-mail.
Also, address the reply back to the conference - more people may have ideas.
It occurs to me, that if there is no error, and the interpolation throws
unchanged input raster on you, that perhaps the input raster contains
zero values instead of no-data (null) values or something - then there
would be nothing to interpolate... But without seeing the data or the
commands used it is just wild guessing..
Regards,
Tomas
Dne 25.5.2015 v 13:43 Irantzu Alvarez napsal(a):
Hello Tomas,
As you said, I think that the problem could be in the volume of data.
My contours are of 300 MB and if I set a region with resolution of 1 m
(the one I would like to perform) the output raster has over 3 billion
cells. Although I have a high capacity computer, grass doen't compute
the surface. With a resolution of 10 m my region setting are:
g.region -p
projection: 1 (UTM)
zone: 30
datum: etrs89
ellipsoid: grs80
north: 4818930
south: 4791480
west: 486510
east: 601280
nsres: 10
ewres: 10
rows: 2745
cols: 11477
cells: 31504365
I am trying to generalize contours, in order to reduce the contour
file, but I don't know which algorithm is better in that case.
After that I will try to use diferrent resolutions to see if that is
the problem.
All the best,
irantzu
2015-05-25 10:12 GMT+02:00 Tomáš Brunclík <[email protected]
<mailto:[email protected]>>:
Hello,
I tried to process bathymetry lines with negative elevation and it
just worked in GRASS 7.0.1svn r65198 @Linux. Maybe try if it works
with coarser resolution or region subset to test if the data
volume is the problem, or if your version of GRASS really has
problem with negative elevation values. Also try to look if the
input raster contains expected values, if you did not check that
already.
If the problem persists, post your findings with log of the
commands you used, your GRASS version and platform.
If it seems a problem of the GRASS module, and you are using a
recent version of GRASS, it would be better to fill a bug,
instructions at http://grass.osgeo.org/development/bug-tracking/
Regards,
Tomas Brunclik
Dne 18.5.2015 v 16:47 Irantzu Alvarez napsal(a):
I am trying to create a DEM from a bathymetric contour lines.
Contours are in vector format and the elevation value is negative
(integers). To create the surface I have converted the contours
in raster (v.to <http://v.to> rast) and then I have used
r.surf.contour, but It doesn't work (there is no error but the
resulting output rasteris exactly the same as the previous one,
without any interpolation).
This are my region settings:
g.region -p -a raster=contours@iiaa nsres=1 ewres=1
projection: 1 (UTM)
zone:30
datum:etrs89
ellipsoid:grs80
north:4818927
south:4791484
west:486512
east:601275
nsres:1
ewres:1
rows:27443
cols:114763
cells:3149441009 <tel:3149441009>
I need a DEM of very high resolution of a wide area. I am using a
computer with large capacities for it.
Could someone help me please?
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