Hi list,
I'm trying to create a shadow map of buildings.
Well, I have a vector buildings map that I rasterized with Z values. This
worked ok.
I, then, generated slope map and aspect map -which contains only null
values, but that's ok.
I'm trying now to generate a shadow map but I'm not able to. I did 2 things
:
1 - first, I tried the following script
/www.grassbook.org/scripts2nd/rsun_crop.sh.txt. It generates files but I get
nothing when displaying them and for now I don't want all these values but
just want to understand better how it works.
2 - I want then to run that simple command line :
r.sun -s elevin=bati_rast aspin=bati_aspect slopein=bati_slope day=82
time=16 glob_rad=bati_grad
but I'm still not able to display anything on my monitor (no irradiation nor
shadow).
For information, I use grass v 6.4.0+42329 and my raster is supposed to be
projected in Lambert 93 :
*g.region -p* gives me the following result :
/projection: 99 (Lambert Conformal Conic)
zone: 0
datum: towgs84=0,0,0,0,0,0,0
ellipsoid: grs80
north: 769395.43918527
south: 768108.47249135
west: 401488.30985985
east: 403400.72187053
nsres: 0.99997412
ewres: 1.00021549
rows: 1287
cols: 1912
cells: 2460744
/
Do the /-s option/ work in both modes? In that case, what is returned when
no local time is given or when working in mode 2?
Help would be very appreciated!
Many thanks,
simo
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