2011/11/26 Hamish <hamis...@yahoo.com>: > Helena wrote: >> - in wxnviz to avoid the very small zexag for latlong, > > another idea for lat/lon z-exag: just figure out what is 20-25% of the canvas > height (or ~15% of the north-south image width), > and work backwards from there, rounding to the nearest nice > round number. > > I don't know if there is any real way to escape from x:y:z ratios > of 1 : 1 : 1/(1852*60), as anything other than that is numerically > synthetic. if taking up the 1:cos(lat) aspect ratio adjustment > perhaps rather than converting the elevation data to degrees, > we could convert the ew, ns to "meters" to get ratios of > 1852*60*cos(lat): 1852*60 : 1 as the cheap and dirty projection. > for global lat/lon views you probably wouldn't want to do that > though. > > > Hamish >
Hi, I think we should revert the changes in zexag, it's the only way to set real exaggeration. Very small zexag values with lat/lon maps are inconvenient but still it works. I like the possible solution with 1852*60*cos(lat) but I'm not sure I'll be able to implement it, I remember I tried to do something similar but I couldn't get it work (OGSF is quite messy). I can try again (but not now, maybe in the next few weeks). Anna _______________________________________________ grass-dev mailing list grass-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-dev