Hi Even, thx for response.
Please can you help me to better understand the question ? My raster is effectively a 18000 x 24000 px image with tiles. it have a tile size of 1024 x 1024 produced from gdalwarp: gdalwarp -s_srs EPSG:32632 -t_srs EPSG:32632 -overwrite --config GDAL_CACHEMAX 1000 -wm 1000 -co TILED=YES -co COMPRESS=NONE -co BLOCKXSIZE=1024 -co BLOCKYSIZE=1024 -co BIGTIFF=YES -co SPARSE_OK=TRUE ....... and also have overviews from gdaladdo --config GDAL_CACHEMAX 1500 -ro -r average ..... 2 4 8 16 32 64 128 256 512 1024 If I understand correctly your info. The mapserver could search the min/max using only the first tile ? This mean that it more probably found always only 0 values or near 0 values beacuse these could be the values in the first tile. And so it return a white image because the min/max is always min=0/ max=0 (or something quite like this) I understand correct ? thx, A. 2015-08-04 16:01 GMT+02:00 Even Rouault <[email protected]>: > On Monday 03 August 2015 11:02:43 Andrea Peri wrote: >> Hi, >> I have a geotiff multibands with float64 values to serve with a wms >> mapserver service. >> >> With this kind of rasters, >> is affordable the directive >> >> PROCESSING "BANDS=4,3,2" >> PROCESSING "SCALE=AUTO" >> >> (the 4,3,2 are the red,green,blue channels) >> >> Infact it seem do nothing. >> >> Instead all work well if I set: >> >> PROCESSING "BANDS=4,3,2" >> PROCESSING "SCALE_1=0.01,0.2" >> PROCESSING "SCALE_2=0.01,0.2" >> PROCESSING "SCALE_3=0.01,0.2" >> >> where ii use the min=0.01 and max=0.2 >> But I like to have the exact values of min/max for every raster. > > Andrea, > > SCALE=AUTO should work but looking at the actual implementation I can see it > computes the min/max on the pixel values intersecting the requested area, and > not on the whole raster as I'd have expected. So in a tiling context, it will > likely not produce the expected result. > > Even > > -- > Spatialys - Geospatial professional services > http://www.spatialys.com -- ----------------- Andrea Peri . . . . . . . . . qwerty àèìòù ----------------- _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
