[mapserver-users] White background in MapCache

[Brown, Donald]

I am having trouble getting rid of the white background (I'd like it to be
transparent) where there is supposed to be 'no data' for the following
service:
http://mrdata.usgs.gov/mapcache/kml/prgeol@WGS84.kml<http://mrdata.usgs.gov/mapcache/kml/sgmc@WGS84.kml>

I tried modifying my mapcache.xml file to say 'mixed' for the format, then
built the tiles using the command:
mapcache_seed -c /mnt/mrt/mapcache/mapcache.xml -t prgeol -g WGS84 -M 8,8

However, this did not seem to work. Any help would be greatly appreciated.
Here is a snippet of my mapcache.xml file:

<?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>

   <format name="PNGQ_FAST" type="PNG">
   <compression>fast</compression>
   <colors>256</colors>
   </format>

   <format name="jpeg" type="JPEG">
   <quality>75</quality>
   <photometric>RGB</photometric>
   </format>

   <format name="mixed" type="MIXED">
     <opaque>jpeg</opaque>
     <transparent>PNGQ_FAST</transparent>
   </format>

   <source name="prgeol" type="wms">
     <getmap>
       <params>
         <FORMAT>image/png</FORMAT>
         <MAP_IMAGETYPE>png</MAP_IMAGETYPE>
         <LAYERS>geol,fault,faultn</LAYERS>
         <MAP>/mnt/mrt/map-files/pr.map</MAP>
       </params>
     </getmap>
     <http>
       <url>http://mrdata.usgs.gov/cgi-bin/mapserv</url>
     </http>
   </source>
   <tileset name="prgeol">
     <source>prgeol</source>
     <cache>disk</cache>
     <grid>WGS84</grid>
     <grid>g</grid>
     <grid>GoogleMapsCompatible</grid>
     <format>mixed</format>
     <metatile>5 5</metatile>
     <expires>86400</expires>
   </tileset>


Thanks!


-- 
Don Brown
GIS Specialist
Cherokee Services Group, LLC (CSG)
Contractor to the U.S. Geological Survey
Fort Collins Science Center
2150 Centre Ave. Bldg. C
Fort Collins, CO 80526
(970) 226-9155
*brownd at usgs.gov* <brownd at usgs.gov>
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