Hi, > I am using r.sun -s to calculate solarmaps for each month. > I wrote a shell script which calculates every 10th day > (including the shaddowing effect). But something is going > wrong. I looks like the shaddows are displaced somehow (see > attachement). Using r.sun2 -s didnt make any difference. > Curiously once it worked! But although I'm using the same > projection, location, mapset and DSM - it doesnt work > anymore. > > I hope anybody could help me out or have any ideas how I > could solve this problem....I really need these maps. ..... > I am using Quantum Gis Version 1.0.2 and GRASS 6.4.0 svn > > > The region of my investigation area is: > > $ g.region -p > projection: 99 (Transverse Mercator) > zone: 0 > datum: > towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232 > ellipsoid: bessel > north: 281981.20714553 > south: 281612.20714553 > west: -29172.52857137 > east: -28383.52857137 > nsres: 1 > ewres: 1 > rows: 369 > cols: 789 > cells: 291141
could you provide the exact command line you were using? are you using r.horizon seeds, or slope and aspect seed maps? what time step? By chance I noticed in xpdf if I dragged with the left mouse button instead of the middle one (to pan) I got an inverse image which made the effect a bit clearer. With that I notice that the center-southmost building in the "ok" map actually isn't. how do you run the two different versions? did you compile the old one? is this the latest SVN? (like younger than a week?) is QGIS only used for visualization or do you run grass from the toolbox? lately we have been running some tests with it*, but in general I think the new version (ie really upgrade) is in fact better than the old, if just because you can avoid the slope/aspect bug now. [*] see http://grass.osgeo.org/wiki/r.sun and https://trac.osgeo.org/grass/ticket/498 building shadows is something I'd always wanted to try with r.sun, interesting to see some results! May I ask if it is LIDAR elevations or simply by e.g. number of storeys? also, may I suggest "r.colors map color=grey -e", where the -e flag may help mute the contrasts a bit. Hamish _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user