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

[Lowell Filak]

Additionally, if it is line data, the polygons defining the higher
accurracy areas could still be drawn after the national data and before
the local data (short form: "between") to obtain the same effect.

Lowell

The following message was sent by Jerl Simpson <jerl.simpson at rkiq.com>
on Tue, 13 Jul 2004 11:17:11 -0500.

> 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
> > _______________________________________________
> > Mapserver-users mailing list
> > Mapserver-users at lists.gis.umn.edu
> > http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
> > .
> > 
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