[GRASSLIST:8853] RE: table of x, y and z points
epatton at nrcan.gc.ca
Thu Nov 3 07:20:44 EST 2005
> I have for example the following text file called teste:
> x y z
> 1 2 3
> 2 3 2
> 4 5 1
> 3 1 2
> I tried
> $ v.in.ascii -z input=/home/teste fs=tab skip=1 and nothing happens.
> Is the command correct?
> Tiago Salgueiro
A couple of reasons why it didn't work:
You didn't specify an output filename for the output parameter. All
parameters marked as required have to be completed.
Your x and y coordinates don't correspond to real-world coordinates, so you
would be unable to visualize your results even if the command was
successful, unless you were working in an XY Location with no projection or
coordinate system being used.
Try filling in more of the parameters for v.in.ascii:
$v.in.ascii -z input=/home/teste output=teste_out format=point fs=tab skip=1
columns='x double precision, y double precision, z double precision, cat
x=1 y=2 z=3 cat=0
Only use the -z flag if you want to create a 3D vector (for visualization in
NVIZ). Otherwise, omit the -z flag and change the z= parameter to '0'. One
other thing I noticed is that the spacing between your x-y columns and y-z
columns are not equal. Make sure the columns are spaced equally.
Technologist, Geo-Spatial Data Services
Geological Survey of Canada (Atlantic)
Natural Resources Canada
Bedford Institute of Oceanography
Dartmouth, Nova Scotia, Canada B2Y 4A2
Postal address: P.O. Box 1006
Courier address: 1 Challenger Drive
E-mail: epatton at NRCan.gc.ca
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