On Fri, Aug 11, 2017 at 12:21 PM, Rahkonen Jukka (MML) <
jukka.rahko...@maanmittauslaitos.fi> wrote:
> Hi,
>
>
>
> I did not notice that reprojection happens.
>
Ah sorry, I thought you did not when I read you stating that the server
should keep the native resolution... which, when reprojecting,
seems a very hard thing to do, at least exactly as requested in the first
mail
The GeoServer resolution is off by just 2mm, or a shift of 0.04% of the
original resolution.
Also, the two coordinate reference systems do not have the same scaling
factor, the target one has a scaling factor
of 1 and UTM32N has a scaling factor or 0.9996, so 1 meter in one is not 1
meter in the other.
Actually, guess what... 5/0.9996 -> 5.0020008, exactly the resolution
computed by GeoServer.
Can we say GeoServer is actually retaining the exact original pixel size
here? :-)
> And this probably explains what should happen with extents and pixel size
> if reader can interpret it (I couldn’t yet).
>
>
>
> “The range values of the response to a successful GetCoverage request
> containing an
>
> outputCrs parameter shall be determined according to the following
> conceptual
>
> evaluation model: Take the bounding box of the request’s subsetting
> parameter (or the full
>
> coverage bounding box if no subsetting was specified in the request);
> re-project this
>
> bounding box to the output CRS provided; generate the result image extent
> as the smallest
>
> bounding box around the reprojected subsetting box; fill this new image
> extent with pixel
>
> values re-projected from the coverage’s Native CRS to the output CRS in a
> way that, for each
>
> axis, the smallest distance between any two reprojected grid points is
> used as offset
>
> (including all interpolation and resampling necessary) unless specified
> otherwise by further
>
> request parameters.
>
Yeah, I read it as well, but could not figure out its meaning either! :-)
Regards,
Andrea Aime
==
GeoServer Professional Services from the experts! Visit http://goo.gl/it488V
for more information.
==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via di Montramito 3/A
55054 Massarosa (LU)
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549
http://www.geo-solutions.it
http://twitter.com/geosolutions_it
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