[STATSGRASS] isolines [solved]

Tim Michelsen timmichelsen at gmx-topmail.de
Tue Mar 22 05:45:45 EST 2005


> On Mon, 28 Feb 2005, Tim Michelsen wrote:
> > > GRASS has limited support for TINs, you would have to extract values at
> > > the nodes (v.in.ogr? -> vector points), interpolate to a raster map
> > > using splines (v.surf.rst), then create vector isolines with r.contour.
> >
> > Do you know any R package that might be able to do the job?
>
> No direct route from points to contours without interpolation in R. The
> nearest I can see would be to use GMT's pscontour, inputting an ASCII xyz
> file, and dumping the contour line output to file.
Finally I used contour() in R native to achive it.

But does anyone know how to plot gradient arrows that demonstrate flow 
streams?
E. g. from the higher valued isoline to the lower valued.

Thanks and greetings,
Tim




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