On Monday 03 March 2008, [EMAIL PROTECTED] wrote: > Dear all, > > I have a set of data points in a semi-column separated file(example file : > test.txt) > For each location, I have meteo data have been recorded. > Missing values are represented by represented by blank. > I am using v.in.ascii to import these points. > Then, I want to interpolate these point data with v.surf.rst. > The interpolation should use only points where there data was recorded, > e.g. to skip points were there is missing value. > But v.surf.rst threat the missing values as is they were "0". > > Do anyone know how to specify to the v.surf.rst function that blank values > are null values ? > Or maybe I should define these point as null values when I import the > points with v.in.ascii ? > > Many thanks in advance, > > Jessica > > Thanks in advance
The trick is to get v.in.ascii to respect any NODATA conventions that are used in your input file. attached is a simple file that contains a NODATA entry, and is read correctly by v.in.ascii. Optionally, you can use the 'where' operator for v.surf.rst to pre-filter your points. Cheers, Dylan -- Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of California at Davis 530.754.7341
594342.09375|4922184.3125|5 600721.546875|4918831.390625|2 602650.21875|4923104.140625| 598199.4375|4923015.125|6
_______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user