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:
<http://geowebcache.org/> 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.
ΒΆ<http://geowebcache.org/trac/wiki/openlayers#YourboundsintheWdirectionareoffsetbymorethan5comparedtotheunderlyinggrid.>
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
<http://geowebcache.org/trac/wiki/GeoWebCache>uses.
OpenLayers? <http://geowebcache.org/trac/wiki/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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