[mapserver-users] mapcache

[John Callahan]

Thanks for the help but I think I'm misunderstanding mapcache at a more
basic level.

What is the mapcachealias?  In the apache httpd.conf file (using the latest
MS4W), there is

MapCacheAlias /mapcache "C:/ms4w/apps/mapcache/mapcache.xml"

How does that relate to my own mapservices?   What changes do I need to
make to have them cached?  My mapservices typically look like

http://servername/myservice?LAYERS=layer1,layer2,...&REQUEST=GetMap&SERVICE=WMS&..
..


Something else that seems strange is when looking at the demo (
http://servername/mapcache/dem/wms), it makes available additional layers
based on entries in the current mapcache.xml file.  When I try to select my
own service through the demo interface, I see that it makes a GetMap
request with LAYERS = tileset name.  Does the name I define for the tileset
in mapcache.xml have to be specific to my map service?  or any special
requirements?

Thanks for your help.

- John





On Wed, Feb 1, 2012 at 6:56 AM, thomas bonfort <thomas.bonfort at gmail.com>wrote:

> On Thu, Jan 26, 2012 at 19:30, John Callahan <john.callahan at udel.edu>
> wrote:
> > I'm giving mapcache a try but with no luck.  Well, some luck.  The module
> > loads fine and the demo (vmap0, http://127.0.0.1/mapcache/demo/wms) also
> > works fine.  I see the tiles being generated on disk.  Great.  However,
> the
> > problem comes in with my own data/services.  A few questions may help me
> > determine the problem.
> >
> > - in the source element, how do you define multiple layers?  Comma
> separated
> > or separate <layers> entries?
>
> <layers>layer1,layer2</layers>
>
> >
> > - in the tileset element, can you have multiple grid entries?  It doesn't
> > seem like it from reading the documentation but the sample tileset shows
> > both the "g" and "WGS84" grids.
> which doc part does not show this?
> http://www.mapserver.org/trunk/mapcache/config.html#tileset
>
> >
> > - for cache type attributes, what are the possible values?  The docs show
> > several possibilities (disk, sqllite, memcache) but the sample shows
> > type="tiff" which is not listed on the doc page.  Can other file
> extensions
> > be used here?
> http://www.mapserver.org/trunk/mapcache/caches.html
>
> >
> > - when I define a FORMAT with name and type, how does that get used?  I
> see
> > that is called in the tileset but how does that relate to the image type
> > under getmap/params/format?
>
> The format is used when recompressing individual tiles after having
> cut a larger metatile. It is also used when combining multiple tiles
> into a single image for a getmap request. If you want to force a
> specific format to be sent to the source wms server when creating a
> tile, you can add a <format>foobar</format> to your source definition
> (at the same level as the <layers> parameter). Both formats don't have
> to be equivalent, it is actually a good idea to request the images in
> png from the source wms server even when using a jpeg format for the
> the tileset, as this will avoid a double jpeg compression (once on the
> wms server, once on the mapcache server) when storing an individual
> tile to the caches.
>
> regards,
> thomas
>
> >
> >
> > The doc page I am referring to is
> > at http://www.mapserver.org/trunk/mapcache/config.html.  I'm sure I'll
> have
> > other questions as I work my way through.  Thanks for this awesome
> addition
> > to Mapserver!
> >
> > - John
> >
> > ***********************************************
> > John Callahan, Research Scientist
> > Delaware Geological Survey, University of Delaware
> > URL: http://www.dgs.udel.edu
> > *************************************************
> >
> >
> > _______________________________________________
> > mapserver-users mailing list
> > mapserver-users at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/mapserver-users
> >
>
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