[GRASS-user] Error in v.vol.rst
seeger at uni-trier.de
Mon Jun 9 02:35:04 EDT 2008
Hello Markus, hello Hamish, and List!
I imported a transformed shapefile.
g.region -p gives:
projection: 1 (UTM)
as it is a gully headcut, I have steep slopes (vertical!) and overhangs
and some shadowing...
> Manuel Seeger wrote:
>> I trying to generate a 3d DEM of a gully headcut. The point
>> data was gained by terrestrial laser scanner.
> what is the form of the raw data? x,y,z point cloud?
> is there only one x,y for each z, or are there overhangs?
> I ask because if there is only one z for each x,y then perhaps a 2.5D surface is more appropriate and the processing is much simpler:
> that may obscure fine details of steep slopes though, lumping them all into one horizontal cell. Maybe the cell resolution would have to be very small.
> If that isn't good enough an idea, if you don't mind it, is to switch the z coordinate with x or y when you import and then look at the thing side on.
>> As I am doing my first attempts, I do not change any
>> parameters from that given by default.
>> This is the result:
>> v.vol.rst input=BAR1_SCAN_UTM at Georef41 wcolumn=dbl_3 tension=40.
>> smooth=0.1 segmax=50 npmin=200 dmin=0.050026 wmult=1.0 zmult=1.0
>> elev=Olite_3d --overwrite
>> 1511728 records selected from table
>> some points outside of region -- will ignore...
>> strip exists with insufficient data
>> Processing all selected output files will require 1435616
>> bytes of disk space for temp files
>> There are points outside specified 2D/3D region--ignored
>> 57754 points (total points: 1511728)
>> Points are more dense than specified
>> 'DMIN'--ignored 1131669 points
>> (remain 380059)
>> Percent complete:
>> Error in COGRR!
>> Interp_call failed!
>> Can someone give me an idea if this is my fault?
> No idea about that.
Dr. Manuel Seeger
Wiss. Assistent Scientific Assistant
Physische Geographie Dpt. of Physical Geography
FB VI - Geographie/Geowissenschaften Geography/Geosciences
Universität Trier University of Trier
D - 54286 Trier
Tel.: +49-651-201 4557
Fax: +49-651-201 3976
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