r.sun

GRASS GRASS user
1

Hi,
had problem with r.sun in grass5.beta6

in flat areas, where aspin=0 and slopein=0 there is no energy
calculation.
How can I avoid this?

Btw. is in grass5 0 no-data like in grass4.2 ?

Dieter
_____________________________________

Dieter Lehmann
University of applied Sciences
Schelmenwasen 4-8
D-72622 Nuertingen, Germany
lehmann@fh-nuertingen.de
Phone: +49 (0) 7022 404 Ext. 192 or Ext. 152
Fax: +49 (0) 7022 404 Ext. 166

2

DIETER LEHMANN wrote:

Hi,
had problem with r.sun in grass5.beta6

in flat areas, where aspin=0 and slopein=0 there is no energy
calculation.
How can I avoid this?

Btw. is in grass5 0 no-data like in grass4.2 ?

Dieter,

r.sun works only with cells with 0 (as valid data). Therefore you must run
r.support on your grids with null data and say yes in this prompt:

you want to create/reset null file for [your.grid.file] so that
all cell values are considered valid data? (y/n) [n]

After that, r.sun should work properly.

Hope this helps!

WBR,

J. Hofierka