[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 
E. g. from the higher valued isoline to the lower valued.

Thanks and greetings,

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