Am 11.12.12 14:51, schrieb Christian Schmitt: > Adrian Musceac wrote: > >> I really hope my toolchain will work on the next issue of terragear :) >> Do we still have terrafit which outputs .fit.gz, and ogr-decode does >> function the same way? Right now I'm on the right path, but it's bumpy. >> I think there's a real need for a LOD system, or another system which >> would allow loading terrain as far as 300 km away, perhaps without adding >> at load time random elements, lights, and stuff. Unfortunately I'm not >> very familiar with OSG database pagers and the underlyings in simgear. >> > > Hi Adrian, > > generally, yes a LOD system would be nice, but it would need considerable > changes on the btg format or a switch to something new. > I'm currently investigating how to make elevation calculation for the > terrain easier and more versatile. I want to use gdalchop for general > processing as gdal reads almost all kinds of raster formats. So we would no > longer have to rely on hgtchop, srtmchop and demchop (yes, it's mad).
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 ------------------------------------------------------------------------------ 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
