plz
can anyone tell me how to modify geoserver source code.i didnt get any idea
from developer manual.i want how to merge geoserver source code in eclipse
using apache tomcat.
plz help me.........
On Fri, Jan 6, 2012 at 3:29 PM, Andrea Aime <andrea.a...@geo-solutions.it>wrote:
> On Thu, Jan 5, 2012 at 4:28 PM, Pierluigi Santin Fintel <
> p.san...@fintelengineering.it> wrote:
>
>> Hi all!
>> hope to find someone that could help me.
>> I have a big raster (geotiff) georeferenced in EPSG:3003
>>
>> I've loaded it to geoserver everything is fine if I query the layer in
>> WMS using 3003, but if I query the same layer using epsg 900913, the
>> quality of the reprojection is very poor. I've adapted the proj parameters
>> to correcly reproject 3003 to 900913 for my local area but while this works
>> perfectly for vector data the result is instead very bad for rasters.
>>
>> Am i missing something?
>>
>
> I cannot be sure without looking at your data, but certainly there are a
> couple of
> things missing to get optimal quality in raster reprojection:
> - be able to select the overview policy. It can be set via code, but it's
> not exposed
> anywhere in GeoServer. At the moment the code uses the "closest
> overview"
> policy, which is a compromise between speed and quality.
> There is another policy that always chooses the overview with the higher
> resolution
> than the request, that one provides better results at the expense of
> performance
> - take into account the reprojection expansion. The Google projection
> expands
> pixels in the south to north direction, Italy is north enough that the
> expansion
> starts to become visible. Long story short, to get good results we
> should read
> more pixels from the source than what we have in the final output image,
> but right now we don't. We'd need an estimator that can determine how
> much
> more of the input we should read (different projections expand the pixels
> in different directions, and by different amounts depending on where on
> the
> earth you are using them).
>
> Internally in my company we discussed these problems a few times already,
> but so far failed to raise the funding necessary to turn the ideas into
> actual code
>
> 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/
> http://www.youtube.com/user/GeoSolutionsIT
> http://www.linkedin.com/in/andreaaime
> http://twitter.com/geowolf
>
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>
>
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