Hi.
I just finished obtaining my DEM of an area of Central Italy and I now
need to compute rainfall data. In this area there are 5 pluviometers at
elevation from 620m a.s.l. ---> 900m a.s.l.
The area is about 80Km^2 and the mean elevation is around 1050m a.s.l.
I've obtained a rainfall ditribution with s.surf.idw npoints=1;
s.surf.idw npoints=5; s.surf.rst (with non tunning).
The last two give similar results (maybe due to the fact that I only
have 5 meteo stations) even though I still have to learn how to tune
s.surf.rst parameters.
However I was thinking if it would have been polite to compute rainfall
starting from the DEM maybe using r.mapcalc. Obviuosly this means that I
would necessarily need a linear regression which interpolates the 5
stations and then would have to feed the DEM + linear interpolation to
r.mapcalc.
Is there anyone who has tried similar problems with r.mapcalc?
All this is done in consideration that having only 5 meteo stations with
large area (and what's more is that they are in mountainous region) does
not give good results.
Thanks and greetings.
On Mon, Jan 13, 2003 at 02:05:04PM +0100, Antonio wrote:
Hi.
I just finished obtaining my DEM of an area of Central Italy and I now
need to compute rainfall data. In this area there are 5 pluviometers at
elevation from 620m a.s.l. ---> 900m a.s.l.
The area is about 80Km^2 and the mean elevation is around 1050m a.s.l.
I've obtained a rainfall ditribution with s.surf.idw npoints=1;
s.surf.idw npoints=5; s.surf.rst (with non tunning).
The last two give similar results (maybe due to the fact that I only
have 5 meteo stations) even though I still have to learn how to tune
s.surf.rst parameters.
You may want to look at this paper:
Hofierka J., Parajka J., Mitasova H., Mitas L., 2002, Multivariate
Interpolation of Precipitation Using Regularized Spline with Tension.
Transactions in GIS 6(2), pp. 135-150.
It uses s.vol.rst to perform a 3D interpolation including the DEM.
Best regards,
Markus Neteler
* martedì 14 gennaio 2003, alle 10:18, Markus Neteler scrive:
You may want to look at this paper:
Hofierka J., Parajka J., Mitasova H., Mitas L., 2002, Multivariate
Interpolation of Precipitation Using Regularized Spline with Tension.
Transactions in GIS 6(2), pp. 135-150.
It uses s.vol.rst to perform a 3D interpolation including the DEM.
Best regards,
Yes. I came accross this reference diffrent time on the net but never
found the whole article. The problem is that in my university library
there aren't any volumes of "Transactions in GIS".
Do you think the authors would send me a copy of their article if I
requested them?
Thanks.
Regards.