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<p class="MsoNormal">Hello List<span style="color:#1F497D">,</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We are currently setting up a cascading WMS using Mapserver as a client to request maps from another Mapserver and from a Tilecache. We have read that Mapserver can be configured to do this but we are running into problems when using Mapserver
as a client to Tlecache. Specifically, how do we publish metadata in the MapSever Client capabilities document about the correct resolutions / bounding box of a Tilecache service.
<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">More details...<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">H</span>ere’s a snippet of our ‘top level’ Mapserver mapfile, which will sit on our public server:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New"">
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> LAYER<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> NAME 'lcr_basemap_cache_wgs84'<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> TYPE RASTER<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> CONNECTIONTYPE WMS<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> CONNECTION "<a href="http://ourserver/tilecache/wms-c/tilecache.py?">http://ourserver/tilecache/wms-c/tilecache.py?</a>"
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> PROCESSING "CLOSE_CONNECTION=DEFER"<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> METADATA<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> "wms_name" "lcr_basemap_cache_wgs84"<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> "wms_title" "Baselayer - Cached"
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> "wms_server_version" "1.1.1"
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> "wms_format" "image/png"<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> "wms_srs" "EPSG:4326"<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> "wms_extent" "165 -48 179.5 -33"<span style="color:#1F497D"><o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> "wms_abstract" "Cached via Tilcache"<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> END<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New""> END</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This pulls a layer from our Tilecache (a snippet from our tilecache config file):<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New"">[lcr_basemap_cache_wgs84]<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New"">type=WMSLayer<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New"">layers=coastpoly,veg,urban_grp,contours,water,coast_feats,height_pnts,tracks,rail,all_roads,railway_station,text<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New"">srs=EPSG:4326<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New"">bbox=165,-48,179.5,-33<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New"">resolutions=0.025398253504337,0.012699126752168,0.006349563376084,0.003174781688042,0.001587390844021,0.000793695422011,0.000317478168804,0.000158739084402,0.000079369542201,0.000031747816880,0.000015873908440,0.000006349563376,0.000003174781688<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New"">url=http://ourserver/cgi-bin/mapserv?map=/path/to/ourmapfile.map&transparent=true&<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New"">extent_type=loose<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New"">metaBuffer=10<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New"">metasize=6,6<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New"">metaTile=true</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">(As you can see, Tilecache is pointing to another Mapserver which generates the maps.)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We have had some success in connecting to the Tilecache via the Mapserver Client using an Openlayers client to view the ‘top level’ WMS layers ** BUT ** this only works because we configured Openlayers to use the correct resolutions / bounding
box etc. What we are really trying to achieve with this is a public WMS for which other people/clients can use, e.g. Openlayers / QGIS, by just reading the Capabilities document provided by the MapServer client.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So far, we have yet to find a way to advertise (via the capabilities document) these underlying Tilecache resolutions as metadata in the cascading level Mapserver. Is this possible?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If it is not possible, does anybody have recommendations as to how to go about this in a standards compliant way?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Many thanks<span style="color:#1F497D">,</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Andy<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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