SCALE_BUCKETS broken for Int16/UInt16 rasters

[warmerdam]

Hi Frank,

I've got a strange problem with Mapserver (both 5.2 and 5.6) with GDAL 1.6, I can't get the scale buckets to be applied. I am using the following:

PROCESSING "SCALE=-5838,4225"
PROCESSING "SCALE_BUCKETS=50"

but when using shp2img in debug mode I still get 8913 scale buckets:

[bart@hades OGC_UMN_services]$ shp2img -m
/data/OGC_UMN_services/machu_bathymetry.map -all_debug 10 -o /tmp/bla
msLoadMap(): 0.243s
msDrawRasterLayerLow(GEBCO): entering.
msDrawGDAL(): src=714,417,4086,2346, dst=0,0,697,400
msDrawGDAL(): red,green,blue,alpha bands = 1,0,0,0
msDrawRasterGDAL_16BitClassification(GEBCO):
  scaling to 8913 buckets from range=-5600.5,3312.5.
msDrawMap(): Layer 0 (GEBCO), 3.905s
msDrawMap(): Drawing Label Cache, 0.000s
msDrawMap() total time: 3.937s
msSaveImage() total time: 0.350s
msFreeMap(): freeing map at 0x895d308.
shp2img total time: 4.538s

The gdalinfo of the tiff is attached.

Do you have any idea what could be causing this and how to improve speed?

TIA.

Best regards, Bart

[warmerdam]

I believe I have corrected this in trunk (r9466) and added a test to the test suite (r9467). This should appear in beta4.

Let me know if the problem persists.