Re: [Mapbuilder-devel] GeoWebCache is now built-in to GeoServer 1.7.1 and works with Openlayers tiling but MapBuilder 1.5 (rc1) tiling errors off

[John M. <mit...@gm...>]

Andreas,

Thanks for the tip!!!

Adding the resolutions to the mappaneol config file now allows me to cache
within MapBuilder 1.5.

I now can display over a million features in 1-3 seconds.

Thanks,

John

On Tue, Dec 16, 2008 at 7:37 AM, Andreas Hocevar <aho...@op...>wrote:

> Hey John,
>
> I can only share my experiences with TileCache here, which does the
> same as GeoWebCache, and this works fine with Mapbuilder 1.5.
>
> Two things you have to take care of:
>
> * You have to add a <resolutions> list in the mappaneol config, and
> put in there a comma separated list of the resolutions you get from
> GeoWebCache's GetCapabilities.
>
> * The extent of your map must be the same as reported by GeoWebCache's
> GetCapabilities, and you have to make sure that
> displayOutsideMaxExtent is set to false (or not included) in the
> mappaneol config.
>
> Regards,
> Andreas.
>
> On Sun, Dec 14, 2008 at 12:23 AM, John Mitchell <mit...@gm...>
> wrote:
> > Hi,
> >
> > GeoWebCache (a WMS tile-caching program) is now built-in to GeoServer
> 1.7.1
> > and works with Openlayers tiling but MapBuilder 1.5 (rc1) tiling errors
> off
> > when the WMS request is sent to GeoWebCache.
> >
> > Will upgrading to MapBuilder 1.5 (rc2) or the final version MapBuilder
> 1.5
> > (when it comes out) cause MapBuilder to generate tiles like the open
> layers
> > demo within GeoServer 1.7.1?
> >
> > The error is listed below:
> >
> > 400: Resolution (2.5111607142858094E-4) is not with 5.0% of the closest
> grid
> > resolution (1.71661376953125E-4)
> >
> > Below is the explanation of the error from the GeoWebCache website
> > documentation:
> >
> > Your bounds in the W direction are offset by more than 5% compared to the
> > underlying grid. ¶
> >
> > Your bounds in the y direction are offset by more than 5% compared to the
> > underlying grid.
> >
> > This means tile size is correct (within 5%), but your request if not
> aligned
> > to the grid that GeoWebCache uses. OpenLayers? can use the extent of the
> > map, layer or some other parameters to automatically calculate this. The
> key
> > thing is to provide maxExtent: new OpenLayers.Bounds(minx,miny,maxx,maxy)
> > such that the values align to the grid of GWC. Basically this consists of
> > taking the map zoomed all the way out (1 tile in EPSG:900913, 2 tiles in
> > EPSG:4326) and then continuously dividing each tile into 4 equally sized
> > tiles. The edges of these tiles represent the grid at each zoomlevel.
> >
> > Thanks,
> >
> > John
> > --
> > John J. Mitchell
> >
> >
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>
>
>
> --
> Andreas Hocevar
> OpenGeo - http://opengeo.org/
> Expert service straight from the developers.
>



-- 
John J. Mitchell