[gdal-dev] MapServer using GDAL_WMS to access TileCache layer

[Even Rouault]

Roger,

your GDAL_WMS xml file is not correct. The format of the URL you use is not 
consistant with the one expected by the "TileService" service. You've used 
the example of "TMS" service (which really new in GDAL 1.7.0dev SVN only) but 
the correct format would be exactly what you have commented out (${x} in 
lowercase, and not {X}).

Best regards,
Even

Le Monday 23 March 2009 21:18:16 Roger André, vous avez écrit :
> Hi All,
>
> I've created a TileCache layer that's being used to overlay tiles in a
> Google Maps page.  That's working just fine, but I would also like to
> access this layer via a MapServer WMS call as well.  I have tried to
> setup a GDAL_WMS file that can read the TileCache layer, but am
> getting "IReadBlock failed" errors when I try to run gdal_translate on
> it, or try to view the layer in a MapServer map.
>
> Below are the pertinent details of my configuration.
>
> TileCache layer:
> -----------------------
> [20m_global]
> type=MapServerLayer
> mapfile=/var/www/mapfiles/20m_global/20m_global.map
> #url=http://10.10.40.152/cgi-bin/mapserv?map=/var/www/mapfiles/20m_global/2
>0m_global.map metaTile=true
> metaSize=2,2
> metaBuffer=0,500
> layers=imagery
> spherical_mercator=true
> srs=EPSG:900913
>
> GDAL_WMS xml file:
> ------------------------------
> <GDAL_WMS>
> <Service name="TileService">
> <!--<ServerUrl>http://tile.openstreetmap.org/${z}/${x}/${y}.png</ServerUrl>
>-->
> <ServerUrl>http://10.10.10.143/cgi-bin/tilecache-2.04/tilecache.cgi/1.0.0/v
>2_80m_global/{Z}/{X}/{Y}.png</ServerUrl> </Service>
> <DataWindow>
> <UpperLeftX>-20037508.34</UpperLeftX>
> <UpperLeftY>20037508.34</UpperLeftY>
> <LowerRightX>20037508.34</LowerRightX>
> <LowerRightY>-20037508.34</LowerRightY>
> <TileLevel>11</TileLevel>
> <TileCountX>1</TileCountX>
> <TileCountY>1</TileCountY>
> <YOrigin>top</YOrigin>
> </DataWindow>
> <Projection>EPSG:900913</Projection>
> <BlockSizeX>256</BlockSizeX>
> <BlockSizeY>256</BlockSizeY>
> <BandsCount>3</BandsCount>
> <Cache/>
> </GDAL_WMS>
>
> gdalinfo output:
> ---------------------
> $ gdalinfo tilecache.xml
> Driver: WMS/OGC Web Map Service
> Files: tilecache.xml
> Size is 524288, 524288
> Coordinate System is:
> PROJCS["Google Maps Global Mercator",
>     GEOGCS["WGS 84",
>         DATUM["WGS_1984",
>             SPHEROID["WGS 84",6378137,298.257223563,
>                 AUTHORITY["EPSG","7030"]],
>             AUTHORITY["EPSG","6326"]],
>         PRIMEM["Greenwich",0,
>             AUTHORITY["EPSG","8901"]],
>         UNIT["degree",0.01745329251994328,
>             AUTHORITY["EPSG","9122"]],
>         AUTHORITY["EPSG","4326"]],
>     PROJECTION["Mercator_2SP"],
>     PARAMETER["standard_parallel_1",0],
>     PARAMETER["latitude_of_origin",0],
>     PARAMETER["central_meridian",0],
>     PARAMETER["false_easting",0],
>     PARAMETER["false_northing",0],
>     UNIT["Meter",1],
>     EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0
> +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext
> +no_defs"],
>     AUTHORITY["EPSG","900913"]]
> Origin = (-20037508.339999999850988,20037508.339999999850988)
> Pixel Size = (76.437028274536132,-76.437028274536132)
> Corner Coordinates:
> Upper Left  (-20037508.340,20037508.340) (180d 0'0.00"W, 85d 3'4.06"N)
> Lower Left  (-20037508.340,-20037508.340) (180d 0'0.00"W, 85d 3'4.06"S)
> Upper Right (20037508.340,20037508.340) (180d 0'0.00"E, 85d 3'4.06"N)
> Lower Right (20037508.340,-20037508.340) (180d 0'0.00"E, 85d 3'4.06"S)
> Center      (   0.0000000,   0.0000000) (  0d 0'0.01"E,  0d 0'0.00"S)
> Band 1 Block=256x256 Type=Byte, ColorInterp=Undefined
>   Overviews: 262144x262144, 131072x131072, 65536x65536, 32768x32768,
> 16384x16384, 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512,
> 256x256
> Band 2 Block=256x256 Type=Byte, ColorInterp=Undefined
>   Overviews: 262144x262144, 131072x131072, 65536x65536, 32768x32768,
> 16384x16384, 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512,
> 256x256
> Band 3 Block=256x256 Type=Byte, ColorInterp=Undefined
>   Overviews: 262144x262144, 131072x131072, 65536x65536, 32768x32768,
> 16384x16384, 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512,
> 256x256
>
> gdal_translate error:
> ----------------------------
> $ gdal_translate -outsize 1% 1% tilecache.xml test.tif
> Input file size is 524288, 524288
> 0ERROR 4: `/vsimem/wms/0x8503470/wmsresult.dat' not recognised as a
> supported file format.
>
> ERROR 1: GDALWMS: Unable to open downloaded block.
> ERROR 1: GDALWMS: ReadBlockFromFile failed.
> ERROR 1: IReadBlock failed at X offset 0, Y offset 0
> ERROR 4: `/vsimem/wms/0x809dc08/wmsresult.dat' not recognised as a
> supported file format.
>
> ERROR 1: GDALWMS: Unable to open downloaded block.
> ERROR 1: GDALWMS: ReadBlockFromFile failed.
> ERROR 1: IReadBlock failed at X offset 0, Y offset 0
>
> MapServer error:
> -----------------------
> msDrawMap(): Image handling error. Failed to draw layer named
> 'imagery'. IReadBlock failed at X offset 1442, Y offset 607: Unable to
> access file. GDALRasterIO() failed: drawGDAL()
>
> If you see anything that jumps out at you as being incorrect, I'd love
> to hear from you.
>
> Thanks,
>
> Roger
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