> > Hi Christian > > Nice to hear that there are some plans (?) with extending gdalchop. As I > mentioned earlier I’m preparing 5x5 degree tiles of all the SRTM data in > geotiff format to use with terragear (just in case someone wants to give > it a try once, I use it for my reliefs and this 5x5 tiles are a side > effect of processing this data). A 5x5 degree geotiff uncompressed will > have around 72 MB. > > When it’s useful and gdalchop can handle this I can prepare the data > with LZW compression, which makes it a bit faster, at least for the > download ;-) Recently the compressed geotiff files will take about 25-30 > GB for the "HGT-SRTM-World" coverage. > > The tiles have 6001 x 6001 pixels in EPSG:4326 projection. For the > reliefs I needed to reproject the data to other projections (EPSG:3857 > or i.e. 3112) and I used gdalwarp for this with lanczos interpolation, > which gives me the best results for reliefs. Iin a graphical sense of > course, I don’t know if it would be also the case for other purpose with > lanczos. > > -Yves >
Hi Yves, Having SRTM data available without the "normal but slightly restrictive" CGIAR license would be a nice plus. I do remember from FS2004 that there was a guy who had very detailed data based on local topo maps and DEM's, his name was Jonathan de Ferranti and the FS terrain was compiled by Holger Sandmann. http://www.viewfinderpanoramas.org/dem3.html was the URL. Can we get ahold of such detailed elevation maps, which far surpass SRTM, especially for the Alps but other mountainous areas too? And could we use this? Cheers, Adrian ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Flightgear-scenery mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-scenery
