Hi Craig,

I think you can use several ways of generate your DEM from xyz points.
One is you use interp function on akima package.

For derive slope and aspect, may be you can use R with GRASS (package
spgrass6) or R with SAGA (package RSAGA).

How about you give a look at:
http://spatial-analyst.net/wiki/index.php?title=Main_Page or
http://www.geomorphometry.org/

bests

milton
brazil=toronto

On Tue, Jul 21, 2009 at 8:27 PM, Scanlan, Craig <
craig.scanlan@agric.wa.gov.au> wrote:

> Hi,
>
> I need to create a matrix of elevation data to plot with persp(). I have
> data in the form of vectors x,y and z. Also, I need to be able to derive
> attributes like slope and aspect from the DEM. I have not been able to
> find any examples of these problems. Are there any available? Any
> suggestions?
>
> Thanks
>
> Craig.
>
>
>
>
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