[Mapserver-users] Using a polygon instead of a bounding box?

[Jerl Simpson]

Would it not work to create a layer with the better data and have it's 
maxscale set?  It would have to overlay the other data.  And since it 
overlays, if it's an opaque polygon, it will cover the other data.

Now, I'm not an expert...by any stretch.  So others may have better ways 
to do this.

Jerl


Timothy Rupe wrote:
> I'm using data from multiple sources, some of which are more accurate
> than others.  When viewed at a national level they are all equally
> accurate, but when viewed at a county level or lower, I want the
> better (local) data sources to "override" the poorer (national) data
> sources.  My problem is that these local data sources are not
> necessarily rectangles, but can be arbitrary polygons.
> 
> I would like mapserver to be able to query my coverage database, get
> the bounding polygons for each data source I need, and then create a
> layer based on this patchwork.  Any locations not covered by the
> higher accuracy local data would be filled in with the national data. 
> Optimally, this would be transparent to the user, and would appear to
> be just another layer served by mapserver.  Is this possible?  If not,
> any ideas or workarounds?
> 
> Thanks,
> 
> Timothy Rupe
> Programmer
> USGS Mid-Continent Mapping Center
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