[GRASS-user] High resolution raster interpolation

[kapo coulibaly]

I tried v.surf.contour and after about 24 hrs of computation the progress
bar was still nowhere to be seen. I'll try to acquire the points from the
county. But i converted the contours to points and tried the whole series of
v.surf (rst, bspline, idw ...etc) with the same result as i stated
previously. But with 50 ft resolution I can complete the computation.
Here is the output for g.region to answer your question about nrows and
ncolumns

north:      808710.758065
south:      736239.936599
west:       377975.676116
east:       465460.787903
nsres:      10.00149344
ewres:      9.99829849
rows:       7246
cols:       8750
cells:      63402500

Cheers

On Mon, Sep 20, 2010 at 10:37 AM, Markus Metz <
markus.metz.giswork at googlemail.com> wrote:

> kapo coulibaly wrote:
> > I'm trying to interpolate a raster from a shapefile (points or contours).
> > The shapefile is a 2ft contour lidar-derived elevation and I need a 10 ft
> > resolution DEM.
>
> Extracting contours discards a lot of information, results are more
> detailed if a raster surface is interpolated straight from the LiDAR
> points. Try any of the v.surf.* modules with the LiDAR points, not the
> contours.
>
> > Obviously even on a dual core dual processor 64 bit
> > workstation with 8 GB of ram I couldn't complete the computation.
>
> How many cells (rows, columns) are in the current region? Did you use
> r.surf.contour? The -s flag might help to reduce memory requirements a
> bit for very large datasets.
>
> Markus M
>
> > Is there
> > an automated way to slice the domain in smaller pieces, carry out the
> > computation and piece them back together afterward? I'm thinking of
> writing
> > a script but i was wondering if it has already been done.
> >
> > Thanks
> >
> > _______________________________________________
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> > grass-user at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/grass-user
> >
> >
>
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