Hi all,
So after a lot of hacking on the latest version of the wms cite tests I
have reached a point where we pass all of them except for two:
wms:wmsops-getmap-each-style
wms:wmsops-getmap-each-layer
And just to point out these are new tests added recently.
The tests in question loop through all layers and do a simple GetMap
request. The reason the request fails is because an "empty" (zero area)
bbox is being sent.
Why it is being sent? Because it is published as empty in the
capabilities document:
<LatLonBoundingBox minx="-2.0" miny="-1.0" maxx="2.0" maxy="6.0"/>
<LatLonBoundingBox minx="-2.0" miny="-1.0" maxx="2.0" maxy="6.0"/>
<LatLonBoundingBox minx="2.0E-4" miny="7.0E-4" maxx="2.0E-4"
maxy="7.0E-4"/>
<LatLonBoundingBox minx="8.0E-4" miny="5.0E-4" maxx="0.0024"
maxy="0.0010"/>
<LatLonBoundingBox minx="-0.0032" miny="-0.0024" maxx="-0.0026"
maxy="0.0024"/>
<LatLonBoundingBox minx="-0.0014" miny="-0.0024" maxx="0.0042"
maxy="0.0018"/>
<LatLonBoundingBox minx="6.0E-4" miny="-0.0018" maxx="0.0031"
maxy="-1.0E-4"/>
<LatLonBoundingBox minx="-0.0042" miny="-0.0024" maxx="0.0042"
maxy="0.0024"/>
<LatLonBoundingBox minx="0.0014" miny="-0.0011" maxx="0.0042"
maxy="0.0024"/>
<LatLonBoundingBox minx="-0.0020" miny="0.0016" maxx="-0.0014"
maxy="0.0020"/>
<LatLonBoundingBox minx="-0.0042" miny="-0.0024" maxx="0.0042"
maxy="0.0024"/>
<LatLonBoundingBox minx="-4.0E-4" miny="-0.0024" maxx="0.0036"
maxy="0.0024"/>
The empty bounding boxes are for point layers that consist of a single
point.
So... where does the fault lie? I believe the WMS spec says that an
empty bounding box is illegal, which makes sense. So is it (a) the
servers fault for advertising it in the capabilities document a so? or
(b) the clients fault for making a request with an empty bounding box?
I would tend to lean toward (a). But if we do fix on the server what is
the fix? Slightly grow the bounding box by some set amount? Not sure.
Food for thought.
-Justin
--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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