Hi list, I have a thousand of file with SRS A which I will to mosaic, reproject to SRS B and then retile (I will use GDAL 1.7.2).
What I will do is: 1- setting up a VRT using gdalbuildvrt on top of the original TIF files. 2- reprojecting it to an intermediary VRT using gdalwarp (to SRS B). 3- retiling the reprojected VRT as 32768x32768 (or something smallers) geotiffs with gdal_retile by also adding JPEG compression, inner 512x512 tiling and bicubic interpolation on intermediate levels How can I get best performances with this operations chaining? >From [1], I see I can play with "--config GDAL_CACHEMAX xxxx -wm xxxx" when invoking gdalwarp. (I will set GDAL_CACHEMAX as an environment var) I see that the wm parameter as well as inner tiling are set on the reprojected.vrt as GDALWarpOptions. Is there a way to set the "-multi" parameter in the reprojected vrt too to make use of this feature to separate thread for I/O and thread for computation? Regards, Daniele [1]: http://trac.osgeo.org/gdal/wiki/UserDocs/GdalWarp -- ------------------------------------------------------- Ing. Daniele Romagnoli Software Engineer GeoSolutions S.A.S. Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584962313 fax: +39 0584962313 mob: +39 328 0559267 http://www.geo-solutions.it http://geo-solutions.blogspot.com/ -------------------------------------------------------
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