[mapserver-users] On-the-fly vertical assembly of disparate tilesets using MapCache?

[John Taranu]

Hello,

 

Is there any recommended way to do multi-tileset vertical assembly in
MapCache?

 

I have the following setup:

 

There are a number (over 30) fully seeded tile caches covering adjacent but
spatially distinct areas.  These tilesets were fully seeded down to the
lowest level, with the seeding restricted to an irregular polygon extent.
Areas beyond the edge of the polygon are not seeded at all.  That is, any
tiles within the dataset's rectangular extents but outside the polygon
extent are not seeded.  The tilesets do not refer back to a MapServer source
for any requests.  This means that any tile requests between the restricted
extent and the polygon extent return a blank image and an HTTP 404 error.

 

I am trying to serve the separate tile sets independently, but also combined
into a single "mosaic-like" tile layer, to be rendered on the fly from the
individual tilesets.    The current set up has the mosaic layer in the
MapCache config as a WMS source, referencing the tile caches as individual
layers, looping back into itself through localhost.   It looks like this:

 

   <source name="MOSAIC_LAYER" type="wms">

      <getmap>

         <params>

            <format>image/png</ format >

            <layers>LAYER1,LAYER2,LAYER3</layers>

            <transparent>true</transparent>

         </params>

      </getmap>

      <http>

         <url>http://localhost/mapcache/service</url>

      </http>

   </source>

 

The problem is that if any tile in the 30 separate cache layers is missing,
MapCache returns a blank tile for the mosaic layer.  

 

Is there another way of configuring a combined mosaic layer in MapCache, or
does this require updates to the code?

 

Thanks,

 

---------------------------------------

John Taranu

Senior Web Developer

First Base Solutions Inc

140 Renfrew Drive, Suite 100

Markham, ON, L3R 6B3

phone: 905-477-3600 ext. 302

email: jtaranu at firstbasesolutions.com

web:  <http://www.firstbasesolutions.com/> firstbasesolutions.com

 

 

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