[mapserver-users] Re: strange raster problem

[Bart van den Eijnden (OSGIS)]

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
>