[mapguide-users] Two Raster Display Questions (Stretching
andRemoving Collars)
Nichols, Mark A.
markn at spicergroup.com
Tue Sep 8 08:02:57 EDT 2009
Regarding your question about bitonal images. Yes, I've got them to work.
See this previous post:
http://n2.nabble.com/Bitonal-Image-Problem-td3156619.html
It might take some work in Irfanview to get just the right export as png.
Mark
-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org on behalf of Darren Cope
Sent: Tue 9/8/2009 7:40 AM
To: mapguide-users at lists.osgeo.org
Subject: Re: [mapguide-users] Two Raster Display Questions (Stretching andRemoving Collars)
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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