My thanks to Stephen and Andreas! Per Stephen's advice, I modified the URL given in the <http> element to point directly at the mapserver executable. Per Andreas's advice, I've modified my OpenLayers interface to use the mapcache TMS for these data. Is there a reason why I should prefer the WMS to the TMS other than a wish to conform to OGC specs?
Peter On Mon, Sep 2, 2013 at 5:26 AM, Eichner, Andreas - SID-NLKM <[email protected]> wrote: > > Good news: it works. But your client needs to be configured to use the cache > layer. Currently you still use the source WMS. Since you have the demo service > of mapcache enabled, you can check this page > http://mrdata.usgs.gov/mapcache/demo/tms > Let your browser show the page source and you can copy-paste the layer > constructor: > > var sgmc_WGS84_tms_layer = new OpenLayers.Layer.TMS( "sgmc-WGS84-TMS", > "http://mrdata.usgs.gov/mapcache/tms/";, > { layername: 'sgmc@WGS84', type: "png", serviceVersion:"1.0.0", > gutter:0,buffer:0,isBaseLayer:true,transitionEffect:'resize', > tileOrigin: new OpenLayers.LonLat(-180.000000,-90.000000), > > resolutions:[0.70312500000000000000,0.35156250000000000000,0.17578125000000000000,0.08789062500000000000,0.04394531250000000000,0.02197265625000000000,0.01098632812500000000,0.00549316406250000000,0.00274658203125000000,0.00137329101562500000,0.00068664550781250000,0.00034332275390625000,0.00017166137695312500,0.00008583068847656250,0.00004291534423828120,0.00002145767211914060,0.00001072883605957030,0.00000536441802978516], > zoomOffset:0, > units:"dd", > maxExtent: new > OpenLayers.Bounds(-180.000000,-90.000000,180.000000,90.000000), > projection: new OpenLayers.Projection("EPSG:4326".toUpperCase()), > sphericalMercator: false > } > ); > map.addLayer(sgmc_WGS84_tms_layer) > > Usually it is safe to omit most of the arguments as they are defaults or > derived from the map object, like "serviceVersion" and "resolutions". > > > -----Ursprüngliche Nachricht----- > Von: [email protected] im Auftrag von Schweitzer, Peter > Gesendet: Fr 30.08.2013 23:50 > An: [email protected] > Betreff: [mapserver-users] mapcache config confusion > > Help! > > I am trying to use mapcache, but I fear that I may have misunderstood > the documentation. Can someone help correct my misimpressions? > > I'm running a mapserver (6.2.0) instance with 113 WMS services. Most > don't really need caching because the data are simple or small. One > really does, because it is a geologic map of the continental US at > 1:500k scale, with 320,000 polygons and 260,000 fault lines, and takes > some time to render as map images. > > I have a complicating factor. I'm using a simplified URL to access > the map services, with an Apache rewrite rule like that rewrites the > incoming URL http://mrdata.usgs.gov/services/sgmc-3857 to > http://mrdata.usgs.gov/cgi-bin/mapserv?map=/mnt/mrt/map-files/sgmc-3857.map&;... > This works nicely for OpenLayers. > > What I'd like to have happen is for the web server to provide cached > images of these data rather than generating them on every web hit. > > So first of all, is mapcache the right tool for this task? > > Assuming that's right, I'm confused about the <url> element in the > <source> section. Should this be the existing WMS on my system? > Should it be the URL sent by the user, prior to the apache rewrite > rule? Or should it be the URL that is the result of the rewrite rule? > > An OpenLayers interface that uses these data is at > http://mrdata.usgs.gov/general/map.html The layer in question is the > "Geology" layer. > > I do not get any cached images. I recognize that the problem may be > somewhere else in this process, but here is my mapcache.xml file, > cribbed and modified from an older list message by Stephen Woodbridge: > > <?xml version="1.0" encoding="UTF-8"?> > <mapcache> > <metadata> > <title>MRData mapcache service</title> > <abstract>Contains various services for MRData maps</abstract> > </metadata> > > <cache name="disk" type="disk"> > <base>/mnt/mrt/mapcache</base> > <symlink_blank/> > </cache> > > <source name="sgmc" type="wms"> > <getmap> > <params> > <FORMAT>image/png</FORMAT> > <MAP_IMAGETYPE>png</MAP_IMAGETYPE> > <LAYERS>Lithology,Faults,Dikes</LAYERS> > <MAP>/mnt/mrt/map-files/sgmc-3857.map</MAP> > </params> > </getmap> > > <http> > <url>http://mrdata.usgs.gov/services/sgmc-3857</url> > </http> > </source> > > <format name="PNGQ_FAST" type="PNG"> > <compression>fast</compression> > <colors>256</colors> > </format> > > <tileset name="sgmc"> > <source>sgmc</source> > <cache>disk</cache> > <grid>WGS84</grid> > <grid>g</grid> > <grid>GoogleMapsCompatible</grid> > <format>PNGQ_FAST</format> > <metatile>5 5</metatile> > <expires>864000</expires> > </tileset> > > <default_format>PNGQ_FAST</default_format> > > <service type="wms" enabled="true"> > <full_wms>assemble</full_wms> > <resample_mode>bilinear</resample_mode> > <format>PNGQ_FAST</format> > <maxsize>4096</maxsize> > </service> > <service type="wmts" enabled="true"/> > <service type="tms" enabled="true"/> > <service type="kml" enabled="true"/> > <service type="gmaps" enabled="true"/> > <service type="ve" enabled="true"/> > <service type="demo" enabled="true"/> > > <errors>report</errors> > <lock_dir>/tmp</lock_dir> > </mapcache> > > I am also not seeing error messages in either the apache log or the > mapserver log. Here is my apache config: > > LoadModule mapcache_module modules/mod_mapcache.so > > <IfModule mapcache_module> > <Directory /mnt/mrt/mapcache> > Order Allow,Deny > Allow from all > </Directory> > MapCacheAlias /mapcache "/mnt/mrt/mapcache/mapcache.xml" > </IfModule> > > Thanks in advance for any help you might provide. > > Peter > -- > Peter N. Schweitzer (U.S. Geological Survey, Reston, VA 20192) > (703) 648-6533 email: [email protected] > http://geology.usgs.gov/peter/ > _______________________________________________ > mapserver-users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users > -- Peter N. Schweitzer (U.S. Geological Survey, Reston, VA 20192) (703) 648-6533 email: [email protected] http://geology.usgs.gov/peter/ _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
