[mapserver-users] Mapcache tileset only shows sporadically in KML / Google Earth

[thomas bonfort]

John,
The configuration seems ok, you might want to remove the threaded_fetching
part as it will only help in very specific scenarios.
As for the root issue, are your tilesets fully preseeded or are they
populated on demand? KML superoverlays are organized in a tree, i.e. to
access a tile at zoom level N you first need to access all parent tiles
from level 0 to N-1; on an unseeded tileset with a slow wms backend this
might be a very long wait. Also please check the apache error log for any
mapcache related messages.

regards,
thomas


On 6 June 2013 05:19, John D. Evans <john.evans at gst.com> wrote:

> Hello,
>
> Not sure my earlier query made it to the list.
>
> I'm using MapCache to serve for some satellite image products. It sort of
> works: the tms and wmts browsers at /mapcache/demo show full coverage of my
> data area, and let users zoom in to see full resolution image mosaics. But
> the KML superoverlay (my reason for using MapCache) only displays in Google
> Earth when I'm zoomed very far out (so that the entire globe is not much
> bigger than a golf ball on my screen). If I zoom in, the image usually
> disappears; though sometimes when zoomed in I do see [only] the right
> (east) half of my tileset, at a very low resolution.
>
> Do you see anything wrong with my mapcache.xml (below)?
> Is there anything else I should be checking?
>
> (I'm using a simple disk cache in /tmp, with mod_mapcache from the Ubuntu
> libmapcache 1.0.0-3 package; Mapserver 6.2.1 is on the same machine,
> running in 64-bit Ubuntu 12.04. Mapserver works fine, and reports no errors
> [I think]. My client is Google Earth 7.)
>
> Thanks for taking a look,
>
>   - John D. Evans
>     GST, Inc / Greenbelt, MD
>
> Below is my mapcache.xml file (actually an excerpt of it:
> the real one has more tilesets and sources).
>
> <mapcache>
>    <metadata>
>       <title>my mapcache service</title>
>       <abstract>woot! this is a service abstract!</abstract>
>    </metadata>
>
>    <cache name="disk" type="disk">
>       <base>/tmp</base>
>       <symlink_blank/>
>    </cache>
>
>    <format name="PNG_BEST" type ="PNG">
>       <compression>best</**compression>
>    </format>
>    <format name="PNG_FAST" type ="PNG">
>       <compression>fast</**compression>
>    </format>
>
>      <source name="CSPP_CloudPhase" type="wms">
>       <http>
>          <url>http://localhost/cgi-bin/**mapserv<http://localhost/cgi-bin/mapserv>
> ?</url>
>       </http>
>       <getmap>
>          <params>
>             <FORMAT>image/png</FORMAT>
>             <LAYERS>iicmocp_daily</LAYERS>
>             <MAP>/raid/maps/viirs.map</**MAP>
>          </params>
>       </getmap>
>    </source>
>
>    <tileset name="CSPP_Cloud_Phase_EDR">
>       <metadata>
>          <title>VIIRS Cloud Phase from NASA GSFC DRL</title>
>          <abstract>Detailed description goes here</abstract>
>       </metadata>
>       <source>CSPP_CloudPhase</**source>
>       <cache>disk</cache>
>       <format>PNG</format>
>       <grid>WGS84</grid>
>       <metatile>2 2</metatile>
>       <expires>3600</expires>
>       <auto_expire>3600</auto_expire>
>       <!-- <metabuffer>10</metabuffer> -->
>    </tileset>
>
>    <default_format>PNG_FAST</**default_format>
>
>    <service type="wms" enabled="true">
>       <full_wms>assemble</full_wms>
>       <resample_mode>bilinear</**resample_mode>
>       <format>PNG_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"/>
>
>    <lock_dir>/tmp</lock_dir>
>    <errors>report</errors>
>    <threaded_fetching>true</**threaded_fetching>
>
> </mapcache>
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