[mapguide-users] Two Raster Display Questions (Stretching and Removing Collars)

[Darren Cope]

I'm still struggling after having tried everything I can think of.  Is the
only solution to pre-process the imagery via gdal or the like?  If so, which
command would I use to 'stretch' the histograms without actually modifying
the pixel (elevation) values in the DEMs?

Any thoughts on either question much appreciated.

Cheers,

Darren


Darren Cope wrote:
> 
> Hi folks,
> 
> Two questions regarding raster display in MGOS:
> 
> 1.  I have a set of DEMs from Geobase (approx. 100 tiles).  I've created a
> Data Connection in Studio to the directory containing the images, and then
> a layer pointed at the data connection.  However, because the max/min
> values of each tile differ, they are not displayed using the same range. 
> How can I 'stretch' all tiles to the max/min of the entire set?  Images
> are in GeoTiff format if that matters.
> 
> 2.  I have a set of SPOT imagery (also from GeoBase) that are set up in
> the same way as above (except in ecw format).  How do I remove the black
> collars around the images?  The Bitonal Image settings in Studio don't
> seem to work, and the "Transparency Colour" under Advanced in Maestro
> doesn't work either.  Thoughts?
> 
> Thanks for your help!
> 

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