Selon Greg Coats <[email protected]>:
-wm is an option specific to gdalwarp. Here's detailed explanation :
http://trac.osgeo.org/gdal/wiki/UserDocs/GdalWarp#WarpandCacheMemory:TechnicalDetails
Just to add that the default value is 64MB of RAM, see the snippet below, which I took from
http://trac.osgeo.org/gdal/browser/trunk/gdal/alg/gdalwarpoperation.cpp
498 /* --------------------------------------------------------------------
*/
499 /* Default memory available.
*/
500 /*
*/
501 /* For now we default to 64MB of RAM, but eventually we should
*/
502 /* try various schemes to query physical RAM. This can
*/
503 /* certainly be done on Win32 and Linux.
*/
504 /* --------------------------------------------------------------------
*/
505 if( psOptions->dfWarpMemoryLimit == 0.0 )
506 {
507 psOptions->dfWarpMemoryLimit = 64.0 * 1024*1024;
508 }
One thing I learnt recently is that increasing the -wm value is
counter-productive when warping small tiles into a big mosaic.
Hermann
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