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

Roger André randre at gmail.com
Mon Mar 23 16:48:08 EDT 2009


Hi Even,

Thanks for the info.  I have updated my GDAL_WMS file to now show:

<ServerUrl>http://10.10.10.143/cgi-bin/tilecache-2.04/tilecache.cgi/1.0.0/v2_80m_global/${z}/${x}/${y}.png</ServerUrl>


Still doesn't work though.


gdal_translate -outsize 1% 1% tilecache.xml test.tif
Input file size is 524288, 524288
0ERROR 4: `/vsimem/wms/0x8503480/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/0x809dc28/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


On Mon, Mar 23, 2009 at 1:35 PM, Even Rouault
<even.rouault at mines-paris.org> wrote:
> 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
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
>
>


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