JIRA opened as:
https://jira.codehaus.org/browse/GEOS-6464
Improvement - Interpolation of data instead of images for non-RGBA rasters
- Mike
On Mon, Apr 28, 2014 at 3:53 PM, Mike Grogan <[email protected]>wrote:
> Yes, I will create the JIRA, Simone. I am just seeing this today as I
> have been away for a few days unexpectedly, so it may take just a bit to do
> so.
>
> From my initial effort, my early recommendation would be to have this
> available as some type of rendering transformation instead of implementing
> it for all layers coming from the WMS. This would allow someone to "turn
> on" and "turn off" the interpolation. That describes the (very simple)
> code I have been playing with. I will attach that to the JIRA when I
> create it.
>
> Thanks,
>
> Mike
>
>
> On Thu, Apr 24, 2014 at 6:58 AM, Simone Giannecchini <
> [email protected]> wrote:
>
>> Ciao Mike,
>> I am interested in fixing this for good.
>>
>> As Andrea pointed out it some effort is required, however I believe
>> this is strategic for GeoServer to properly render environmental data
>> with high order interpolation. As such, could you create a jira for
>> this problem and make available the code you are playing with?
>>
>> Next week I will talk to the guys in the office and come up with a
>> tentative plan to fix this on master.
>> Thanks for taking the time to look into this.
>>
>>
>>
>> Regards,
>> Simone Giannecchini
>> ==
>> Meet us at GEO Business 2014! in London! Visit http://goo.gl/fES3aK
>> for more information.
>> ==
>>
>> Ing. Simone Giannecchini
>> @simogeo
>> Founder/Director
>>
>> GeoSolutions S.A.S.
>> Via Poggio alle Viti 1187
>> 55054 Massarosa (LU)
>> Italy
>> phone: +39 0584 962313
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>>
>> http://www.geo-solutions.it
>> http://twitter.com/geosolutions_it
>>
>> -------------------------------------------------------
>>
>>
>> On Fri, Apr 18, 2014 at 3:38 PM, Mike Grogan <[email protected]>
>> wrote:
>> > [For some reason, SourceForge has again posted my response as a blank /
>> > empty message. So, I am just submitting this again for the record, in
>> case
>> > someone else is researching this in the future. Sorry for any double
>> > e-mails to those subscribed to the list].
>> >
>> > Thanks for confirming my suspicions. I know there would be some
>> development
>> > work, but I hope you agree the interpolation should really be done on
>> the
>> > data, not the resulting RGB image. As Jody pointed out, this is really
>> what
>> > you want for elevation data, etc. Should I / may I open a JIRA as a
>> Feature
>> > Request just to log this for the future?
>> >
>> > In the interim, I have been able to accomplish this, at least
>> tentatively,
>> > for my own purposes and want to see if you see any holes in my approach:
>> >
>> > Here is output from GeoServer ... and you can compare to my previous
>> screen
>> > shots in this thread:
>> >
>> > http://i.imgur.com/twqDa0r.png
>> > http://imgur.com/twqDa0r
>> >
>> > You'll notice this is the Arc_Sample precip layer with the DATA
>> > interpolated, instead of the IMAGE.
>> >
>> > Thus far, I have implemented this as a Custom Rendering Transformation
>> WPS
>> > that does the following:
>> >
>> > 1. Takes a GridCoverage2D along with output bounding box, width, and
>> height
>> > as parameters.
>> > 2. Crops the input GridCoverage2D to the output bounding box.
>> > 3. Scales (within limits) the cropped GridCoverage2D based on its size
>> > compared to the size of the output width/height.
>> > 4. Applies Bilinear interpolation while scaling in #3.
>> > 5. Returns a scaled and bilinear interpolated GridCoverage2D to which a
>> > ColorMap is then applied in the SLD.
>> >
>> > Any major holes in my approach? Things to consider or check?
>> >
>> > Obviously I want to add some more input validation, etc.
>> >
>> > One immediate thing I see is the need to perhaps crop a little larger
>> than
>> > my output BBOX so I don't see issues with discrepancies along tile
>> > boundaries.
>> >
>> > Something else I thought of is that the WPS-style approach also lets
>> people
>> > choose a per-layer WMS interpolation method, as has been requested in
>> other
>> > threads.
>> >
>> > Thanks,
>> >
>> > Mike Grogan
>> >
>> >
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>
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