We finally identified this issue, it seems that the SCALE_1 processing directive does not work in case of 1 band images? Using SCALE instead of SCALE_1 did the trick.
Is this a known issue/limitation? Best regards, Bart > Hi list, > > we have a strange problem with an ArcSDE raster layer. At certain zoom > levels the pixels are very coarse. Zooming out one level the pixels are > okay, however the colour is not. > > You can see this in the following images, the first one is zoomed out and > everything is okay (except the colours since the image should be mostly > black): > > http://www.osgis.nl/download/mapserver/rws1.png > > However when zooming in one level, we obtain the following situation: > > http://www.osgis.nl/download/mapserver/rws2.png > > Does anyone have an explanation for this? Using Mapserver trunk from about > 3 months back and GDAL 1.7.2. > > This is the info from ArcCatalog about the raster layer: > > <TreeList><Data_Source><Raster>BODEM.DNZ_GRINDPERCENTAGE_TOT_15CM</Raster><Data_Type>SDE > Raster</Data_Type><Server>geodatabase.ad.rws.nl<User>RWS_LEZEN</User><Instance>5151\tcp</Instance><Database></Database><Version>SDE.DEFAULT</Version></Server></Data_Source><Raster_Information><Columns_and_Rows>1161, > 2021</Columns_and_Rows><Number_of_Bands>1</Number_of_Bands><Cellsize__X._Y_>250.00000000000011, > 250</Cellsize__X._Y_><Uncompressed_Size>8.95 > MB</Uncompressed_Size><Format>SDR</Format><Source_Type>continuous</Source_Type><Pixel_Type>floating > point</Pixel_Type><Pixel_Depth>32 > Bit</Pixel_Depth><NoData_Value>-3.402823E+38</NoData_Value><Colormap>absent</Colormap><Pyramids>level: > 4, resampling: Nearest > Neighbor</Pyramids><Compression>LZ77</Compression></Raster_Information><Extent><Top>6199911.5560208503</Top><Left>459782.82782689098</Left><Right>750032.82782689109</Right><Bottom>5694661.5560208503</Bottom></Extent><Spatial_Reference>ETRS_1989_UTM_Zone_31N<Linear_Unit>Meter > (1.000000)</Linear_Unit><Angular_Unit>Degree > (0.017453292519943299)</Angular_Unit><False_Easting>500000</False_Easting><False_Northing>0</False_Northing><Central_Meridian>3</Central_Meridian><Scale_Factor>0.9996</Scale_Factor><Latitude_Of_Origin>0</Latitude_Of_Origin><Datum>D_ETRS_1989</Datum></Spatial_Reference><Statistics><Band_1><Build_Parameters>skipped > columns:1, rows:1, ignored value: > </Build_Parameters><Min>0.5</Min><Max>59.80879974365234</Max><Mean>0.831969292920005</Mean><Std_dev.>2.825845448840229</Std_dev.><Classes>0</Classes></Band_1></Statistics></TreeList> > > The LAYER definition is: > > LAYER > CONNECTIONTYPE SDE > DATA > "SDE:xxxxx.ad.rws.nl,port:5151,5151,RWS_LEZEN,XXXXXX,BODEM.DNZ_GRINDPERCENTAGE_TOT_15CM,RASTER" > DUMP TRUE > EXTENT 459782.827826891 5694661.55602085 750032.827826891 > 6199911.55602085 > NAME "BODEM.DNZ_GRINDPERCENTAGE_TOT_15CM_5925" > PROCESSING 'CLOSE_CONNECTION=DEFER' > PROCESSING 'DITHER=NO' > PROCESSING 'NODATA=NODATA' > PROCESSING 'SCALE_1=0.5,59.8087997436523' > PROCESSING 'BANDS=1' > PROCESSING 'LOAD_FULL_RES_IMAGE=NO' > PROCESSING 'LOAD_WHOLE_IMAGE=NO' > SIZEUNITS PIXELS > UNITS METERS > STATUS ON > TEMPLATE 'blank.html' > TOLERANCE 5 > TOLERANCEUNITS PIXELS > TYPE RASTER > PROJECTION > 'init=epsg:25831' > END > METADATA > 'wms_title' 'Grindpercentage, stretched' > 'wms_layer_group' '/Grindpercentage_ NCP' > 'wms_metadataurl_format' 'text/xml' > 'wms_metadataurl_href' > 'http://test.intranet.rijkswaterstaat.nl/services/geoservices-update/metadata/BODEM.DNZ_GRINDPERCENTAGE_TOT_15CM' > 'wms_metadataurl_type' 'TC211' > 'wcs_abstract' 'noordzee grind en zand raster' > 'wcs_bandcount' '1' > # 'wcs_description' 'noordzee grind en zand raster' # Optional > 'wcs_extent' > '459782.827826891,5694661.55602085,750032.827826891,6199911.55602085' > 'wcs_formats' 'GTiff,MrSID,ECW' > 'wcs_keywords' 'RWS,Rijkswaterstaat,noordzee grind en zand > raster,BODEM.DNZ_GRINDPERCENTAGE_TOT_15CM_5925' > 'wcs_label' 'Grindpercentage, stretched' # Required > 'wcs_metadatalink_format' 'text/xml' > 'wcs_metadatalink_href' > 'http://test.intranet.rijkswaterstaat.nl/services/geoservices-update/metadata/BODEM.DNZ_GRINDPERCENTAGE_TOT_15CM' > 'wcs_metadatalink_type' 'TC211' > 'wcs_name' 'BODEM.DNZ_GRINDPERCENTAGE_TOT_15CM_5925' > # 'wcs_nativeformat' 'Raster' # Optional > 'wcs_rangeset_label' 'Grindpercentage, stretched' > 'wcs_rangeset_name' 'BODEM.DNZ_GRINDPERCENTAGE_TOT_15CM_5925' > END > PROCESSING 'SCALE_BUCKETS=256' > CLASS > STYLE > COLORRANGE 0 0 0 255 255 255 > DATARANGE -4.81972160476045 6.48366019060046 > RANGEITEM "pixel" > END > END > END > > TIA. > > Best regards, > Bart > _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users