On Feb 13, 2007, at 8:06 PM, Daniel Morissette wrote:
Steven M. Ottens wrote:
On Feb 13, 2007, at 3:25 PM, Stephen Woodbridge wrote:
If you always get all 4 results, then only put the Query
information in the most detailed layer and you will then always
get just that one. IE: remove it from the other layers.
Steve,
I'm slightly at a loss here. What is the query information
exactly? I cannot remove the CLASSITEM from the other layers since
they are raw grids which need to be classified. If I remove
TEMPLATE and the gml_* items from a layer mapserver complains
that layers are not queryable.
The GetFeatureInfo request contains a QUERY_LAYERS parameter with
the list of layers to query. If you list all 4 layers in
QUERY_LAYERS then MapServer returns results from each of them. If
you want results from only the most detailed layer then list only
that layer in QUERY_LAYERS.
Ok, but that means that the client needs to know which layer is the
preferred layer for getFeatureInfo. As far as I know, there's no
obvious way to automatically use the most detailed layer. The layer
can be added dynamically through a getCapabilities request, but there
are a few dozen others as well.
Right now I have the group layer in the query_layers parameter, just
like I have it in the getMap parameter. In the getMap I get 1 image
back, the one which is suitable for that particular scale level. In
my opinion it would make sense if a similar behavior would be
possible for the getFeatureInfo.
Anyway since I do control the client I can hack it to check if the
particular layer for getFeatureInfo is indeed the elevation layer and
replace the group-name for the most detailed layer name.
Thanks for the help,
Steven
