On Wed, Jun 20, 2012 at 1:47 PM, Neumann, Tobias <
[email protected]> wrote:
> Hi,****
>
> ** **
>
> I am just trying to serve DTED-Data as BIL via Geoserver using an
> ImageMosaic. This will enable the Geoserver to deliver whole DTED-datasets
> as elevation to WorldWind. ****
>
> ** **
>
> The development process is running well, but actually I am running into
> the problem that I have got DTED files with NODATA-Areas (Null) and I want
> to use the interpolation capability of the imagemosaic RasterManager.
> Without interpolation everything works fine and the NODATA-values are set
> to -32767.0 (Float32) in the output image. When I am using an interpolation
> mechanism like Interpolation.INTERP_BILINEAR or Interpolation
> INTERP_BICUBIC the output image contains strange values at the edges of the
> NODATA areas. How can I exclude the NODATA values from the interpolation?
>
I don't think there is a way at the moment. The Java Advanced Imaging
library that we use to manipulate raster data lacks the very notion of
NODATA elements.
What we could do is to write our own interpolation methods that handle
nodata,and then have the code instantiate them accordintly,
this in turn would result in a performance degradation if you have native
JAI installed, since native implementation could not be used anymore
(may not be such a tragic thing, but a loss nevertheless).
Long story short, it's doable, but it requires a directed effort to address
the problem and make sure the performance degradation is there
only if NODATA elements are present in the mix and higher order
interpolations are requested.
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
mob: +39 339 8844549
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
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http://www.linkedin.com/in/andreaaime
http://twitter.com/geowolf
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