On Thu, Aug 11, 2011 at 8:22 PM, Scott Ellis <[email protected]> wrote:
> Hi, I have registered some GeoTIFF raster data with GeoServer and am
> displaying it in a browser using OpenLayers. The raster data for the whole
> file ranges from 52 to 2047. The problem is that GeoServer stretches the
> raster data to fit from 0 to 255 based on the min/max of each tile or the
> bounding box instead of the min/max of the overall file. This means the
> image looks good when zoomed out, but as you zoom in the problem gets worse
> and worse. Please see the attached image below. In the middle of the lake,
> the min/max of the data in that tile has narrow range so the effect is most
> apparent. The same problem appears in single tile mode based on the bounding
> box. ****
>
> ** **
>
> Is there a way to make GeoServer stretch the raster data based on the
> min/max of the whole file and not the particular tile or the bounding box?
>
Just to be sure, are you applying contrast stretching in the raster
symbolizer?
Afaik there is no way to make it use the whole file statistics, for large
mosaics it would literally kill the server to compute
that (we often play with mosaic several TB large)
Cheers
Andrea
--
-------------------------------------------------------
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 962313
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
http://www.youtube.com/user/GeoSolutionsIT
http://www.linkedin.com/in/andreaaime
http://twitter.com/geowolf
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