On 24/06/2010 16:40, GeoSpatial - Kevin wrote:
Hi all,
I am trying to re-project a very large imagery (size 40,000 by 40,000
pixels, resolution ~120m) located at high latitudes (60N) to a standard
wgs84. By searching some previous posts, I come up with the following
command:
gdalwarp -of EHdr -t_srs EPSG:4326 -tr 0.001111 0.001111 --config
GDAL_CACHEMAX 200 -wm 200 -wo SKIP_NOSOURCE=YES -r bilinear -multi
input_ice.tif output_ice.tif
it is working now but the speed is very slow - likely this will take 12
hours... Any way to speed up or am I wrong selecting those parameters?
Thanks.
- multi doesn't work for me:
CPLCreateThread: Fails to dummy implementation
ERROR 1: CPLCreateThread() failed in ChunkAndWarpMulti()
However, without the -multi switch, my input data (100m raster,
48500x41500, Type=Int16) is warped in 34 minutes or so, see here:
time gdalwarp --debug on -of EHdr -t_srs EPSG:4326 -tr 0.001111 0.001111
--config GDAL_CACHEMAX 200 -wm 200 -wo SKIP_NOSOURCE=YES -r bilinear
map2c_100.tif output.tif
real 34m13.134s
user 5m24.524s
sys 0m9.973s
If I raise the values for GDAL_CACHEMAX and -wm, it takes about 15
minutes. I am using GDAL 1.8dev, on a 64-bit Linux machine.
Hermann
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