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<DIV>Hi JAmes</DIV>
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<DIV>I believe sizex,sizey refers to the size a given pixel represents on the ground. eg. a 1:25,000 scale orthophoto may be represented with each pixel = 2.5m on the ground.</DIV>
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<DIV>Here is an example from my mapfile:</DIV>
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<DIV> LAYER<BR> NAME nz50ktm<BR> GROUP "Toposcans"<BR> TYPE RASTER<BR> STATUS ON<BR> CONNECTION "<A href="http://ws-esrimt/arcgis/services/mapservice_topography_raster/MapServer/WMSServer">http://ws-esrimt/arcgis/services/mapservice_topography_raster/MapServer/WMSServer</A>?"<BR> CONNECTIONTYPE WMS<BR> MAXSCALE 60000<BR> MINSCALE 10000<BR> <BR> METADATA<BR> # OGC:WMS specific tags<BR> "ows_title" "NZ 1:50k scale NZTM"<BR> "ows_abstract" "This layer came from the LINZ Topo50 series maps in NZTM"<BR> "WMS_FORMAT" "image/png"<BR> "wms_server_version" "1.1.1"<BR> "wms_opaque" "1"<BR> "wms_group_title" "Toposcans"<BR> "wms_resx" "4.233"<BR> "wms_resy" "4.233"<BR> "ows_extent" "1083997.88 4722000.45 2092003.23 6234002.12"<BR> "wms_srs" "EPSG:2193"<BR> "WMS_NAME" "3"<BR> "wms_exceptions_format" "application/vnd.ogc.se_xml"<BR> END<BR> END</DIV>
<DIV><BR>Regards,</DIV>
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<DIV>Robert S<BR><BR>>>> James Perrins <james.perrins@gmail.com> 16/03/2010 2:51 a.m. >>><BR>Thanks Tamas - but I'm still confused..<BR><BR>With a WMS call I can specify the BlockSize - which I believe controls<BR>the size of the tiles that I get back from the WMS service<BR><BR>If I have set blocksize to be 256 then if I am requesting a WMS image<BR>to fill a 512x512 space on the screen and I have the<BR>OVERSAMPLING_RATIO=1 - I would expect it to request 4 to 9 256x256<BR>tiles (depending on how aligned it was)<BR><BR>"SizeX,SizeY corresponds to the raster dimensions in pixels" -<BR>- is this the raster of the source image (the WMS is vector so this<BR>doesn't make much sense to me?)<BR>- or is it the size of the image produced - which is a series of<BR>256x256 tiles stitched together to whatever size I have requested<BR>through mapserver - so again it doesn't make much sense to me to<BR>define this in the xml file - as it will change as my window resizes.<BR><BR>If talking about a tileserver - e.g OpenStreetMap - what is the<BR>SizeX,Y then - the size of the source raster at its maximum resolution<BR>?<BR><BR>Sorry if these are silly questions - but I'm clearly missing some bit<BR>of basic understanding here<BR><BR>Many Thanks<BR>James<BR><BR>On Mon, Mar 15, 2010 at 12:15 PM, Tamas Szekeres <szekerest@gmail.com> wrote:<BR>><BR>><BR>> 2010/3/15 James Perrins <james.perrins@gmail.com><BR>>><BR>>> Do you know what the SizeX does for WMS as well ?<BR>>><BR>><BR>> SizeX,SizeY corresponds to the raster dimensions in pixels<BR>><BR>> Best regards,<BR>><BR>> Tamas<BR>><BR>><BR>_______________________________________________<BR>mapserver-users mailing list<BR>mapserver-users@lists.osgeo.org<BR><A href="http://lists.osgeo.org/mailman/listinfo/mapserver">http://lists.osgeo.org/mailman/listinfo/mapserver</A>-users<BR><BR></DIV><br><br><table bgcolor=white style="color:black"><tr><td><br>------------------------------------------------------------------<br>
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