Hi Ali,
We have created the following implementations:
Created a Proxy Servlet (this handles the request from the user, provides the
security & auditing mechanisms and also handles the DRM).
We handle the DRM in the proxy by finding out which layer the user has
requested, then appending to the end an appropriate mask layer. This layer
would simply be a layer in geoserver which has the polygons & the username.
So the user would send LAYERS=TOPOGRPAHICAREA, the proxy would parse the LAYERS
parameter, find out which mask layer is appropiate for the user requested
layer, and append resulting in: LAYERS=TOPOGRAPHICAREA,OSMASTERMAPMASK.
We then append a filter, something like
FILTER=()(<Filter><PropertyIsEqualTo><PropertyName>USERNAME</PropertyName><Literal>INFOTECH</Literal></PropertyIsEqualTo></Filter>)
As this is done in the proxy, it is seamless to the user.
The SLD associated with the masking layer is simply a polygon symbolizer. The
polygons in the masking table have to be created with holes - if not then you
can probably create from a normal polygon using a XOR.
Cheers,
Steve
From: Ali Taha [mailto:[email protected]]
Sent: 07 June 2011 22:39
To: [email protected]
Subject: Re: [Geoserver-users] Image mask
Any ideas?
-----------
Dear All,
Is it possible to apply a mask on an image, meaning that, I need to show part
of an image which is inside another vector layer (polygon)?
Thanks
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