Hi,
I agree with Ben, to my knowledge there is no such support yet.
But this is open source, we can add it :-)
See:
https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer
Cheers
Andrea
On Tue, Feb 6, 2018 at 10:40 PM, Ben Caradoc-Davies <b...@transient.nz>
wrote:
> Jerry,
>
> I am not aware of any support for vector components in reprojection. Each
> component is interpolated as a scalar, so interpolated components will be
> relative to the original unreprojected grid. I doubt that direction scalars
> are handled correctly either. I have not looked at this problem in detail
> but I suspect that it would be a substantial job. There are no doubt others
> on this list who know more.
>
> Kind regards,
> Ben.
>
>
> On 07/02/18 10:00, Wilwerding, Jerry wrote:
>
>> Hello,
>> With weather model data, the wind U and V vector components are often
>> represented in terms of the grid orientation instead of being based upon
>> 'true' north.
>>
>> Does GeoServer have any support for preserving the vector representations
>> through projection conversions? If so, will the resulting vector
>> components be based upon the output projection grid or based upon 'true'
>> north?
>>
>> I am not aware of any configurations that will allow two variables
>> (UGRD_ISBL and VGRD_ISBL for example) to be related and transformed as
>> directional vectors.
>>
>> For example, assume a rotated latitude longitude grid (rap naïve grid).
>> Think of this coverage as North America and the top part of South America,
>> rotated 90 degrees clockwise, and then shifted to the left so the pole is
>> approximately 25% inside the right border. The winds vectors are based
>> upon grid direction since 'true' north varies by point as the north pole is
>> inside the coverage boundaries.
>>
>> If I want to convert this projection into a Lambert Conformal Conic or
>> any other projection, it is critical to make sure the wind vectors are
>> properly converted. Simple interpolation as part of the conversion will
>> not work.
>>
>> I have seen some documentation regarding WMS leveraging WPS or similar
>> constructs in order to create wind barbs which represent speed and
>> direction. I believe this works well for WMS when no reprojection is
>> requested. However, I do not believe this same process will work with
>> reprojections unless the underlying wind vectors are handled correctly as
>> part of the reprojection process.
>>
>> Insight on whether directional vectors are supported through
>> reprojections would be appreciated.
>>
>> If it is not supported, what areas of concern exist to add this
>> capability? For example, is it even possible to couple two variables (U
>> and V wind components) under the current design or is that a major refactor?
>>
>> Thanks,
>> Jerry
>>
>>
>>
>> ------------------------------------------------------------
>> ------------------
>> Check out the vibrant tech community on one of the world's most
>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>>
>>
>>
>> _______________________________________________
>> Geoserver-users mailing list
>>
>> Please make sure you read the following two resources before posting to
>> this list:
>> - Earning your support instead of buying it, but Ian Turton:
>> http://www.ianturton.com/talks/foss4g.html#/
>> - The GeoServer user list posting guidelines:
>> http://geoserver.org/comm/userlist-guidelines.html
>>
>> If you want to request a feature or an improvement, also see this:
>> https://github.com/geoserver/geoserver/wiki/Successfully-req
>> uesting-and-integrating-new-features-and-improvements-in-GeoServer
>>
>>
>> Geoserver-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/geoserver-users
>>
>>
> --
> Ben Caradoc-Davies <b...@transient.nz>
> Director
> Transient Software Limited <https://transient.nz/>
> New Zealand
>
> ------------------------------------------------------------
> ------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> _______________________________________________
> Geoserver-users mailing list
>
> Please make sure you read the following two resources before posting to
> this list:
> - Earning your support instead of buying it, but Ian Turton:
> http://www.ianturton.com/talks/foss4g.html#/
> - The GeoServer user list posting guidelines:
> http://geoserver.org/comm/userlist-guidelines.html
>
> If you want to request a feature or an improvement, also see this:
> https://github.com/geoserver/geoserver/wiki/Successfully-req
> uesting-and-integrating-new-features-and-improvements-in-GeoServer
>
>
> Geoserver-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/geoserver-users
>
--
Regards,
Andrea Aime
==
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