[mapserver-users] mapcache config confusion
Schweitzer, Peter
pschweitzer at usgs.gov
Tue Sep 3 14:32:09 PDT 2013
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
<Andreas.Eichner at sid.sachsen.de> 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 at 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: mapserver-users-bounces at lists.osgeo.org im Auftrag von Schweitzer, Peter
> Gesendet: Fr 30.08.2013 23:50
> An: mapserver-users at lists.osgeo.org
> 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: pschweitzer at usgs.gov
> http://geology.usgs.gov/peter/
> _______________________________________________
> mapserver-users mailing list
> mapserver-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>
--
Peter N. Schweitzer (U.S. Geological Survey, Reston, VA 20192)
(703) 648-6533 email: pschweitzer at usgs.gov
http://geology.usgs.gov/peter/
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