[Geoserver-users] SLD Transformation WPS

GeoServer GeoServer User
1

Dear GeoServer Users,

I sent this out awhile back but have not received any response. I thought I’d send this again in case it got lost. Any help you can provide is deeply appreciated.

I am trying to use the transformation element in the SLD to execute a WPS process (for testing purposes, it simply returns the passed in GridCoverage2D raster). The results are not the same (please see attachments). One looks more smoothed and the other one does not. They are both WW3 global, 360x181 Maximum Wave Height coverages.

  1. Without calling WPS process: This looks more smoothed.

http://localhost/geoserver/WW3_GLOBAL/wms?service=WMS&version=1.1.0&request=GetMap&layers=WW3_GLOBAL:global_360x181.max_wav_ht.surface&styles=1_no_wps_style&bbox=-180.0,-90.0,180.0,90.0&width=660&height=330&srs=EPSG:4326&format=application/openlayers

  1. With calling WPS process: This does not.

http://localhost/geoserver/WW3_GLOBAL/wms?service=WMS&version=1.1.0&request=GetMap&layers=WW3_GLOBAL:global_360x181.max_wav_ht.surface&styles=2_yes_wps_style&bbox=-180.0,-90.0,180.0,90.0&width=660&height=330&srs=EPSG:4326&format=application/openlayers

Could you please tell me why the pictures look that way (and perhaps how to fix it)?

Thank you.

Tam O

2

Hi,

This is really, really just a guess…

Maybe it’s related to the GeoTiffPPIO class inside org.geoserver.wps.ppio. You can check this class in WPS src.

Look at “encode” method, which receives an Object (GridCoverage2D) and an OutputStream and writes the GeoTiff to this OutputStream.

I don’t know the details of the parameters used to write the image, but maybe it’s somewhere to start.

Regards,

···

Rodrigo C. Antonialli

Rio Claro - SP - Brasil
LinkedIn: http://www.linkedin.com/in/rcaprofile
Contato: (19) 8136-2347
rcantonialli@anonymised.com
Skype: rc_antonialli

On Fri, Feb 8, 2013 at 3:31 PM, Tam O <tamo@anonymised.com> wrote:

Dear GeoServer Users,

I sent this out awhile back but have not received any response. I thought I’d send this again in case it got lost. Any help you can provide is deeply appreciated.

I am trying to use the transformation element in the SLD to execute a WPS process (for testing purposes, it simply returns the passed in GridCoverage2D raster). The results are not the same (please see attachments). One looks more smoothed and the other one does not. They are both WW3 global, 360x181 Maximum Wave Height coverages.

  1. Without calling WPS process: This looks more smoothed.

http://localhost/geoserver/WW3_GLOBAL/wms?service=WMS&version=1.1.0&request=GetMap&layers=WW3_GLOBAL:global_360x181.max_wav_ht.surface&styles=1_no_wps_style&bbox=-180.0,-90.0,180.0,90.0&width=660&height=330&srs=EPSG:4326&format=application/openlayers

  1. With calling WPS process: This does not.

http://localhost/geoserver/WW3_GLOBAL/wms?service=WMS&version=1.1.0&request=GetMap&layers=WW3_GLOBAL:global_360x181.max_wav_ht.surface&styles=2_yes_wps_style&bbox=-180.0,-90.0,180.0,90.0&width=660&height=330&srs=EPSG:4326&format=application/openlayers

Could you please tell me why the pictures look that way (and perhaps how to fix it)?

Thank you.

Tam O

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3

On Fri, Feb 8, 2013 at 6:31 PM, Tam O <tamo@anonymised.com> wrote:

Dear GeoServer Users,

I sent this out awhile back but have not received any response. I thought I’d send this again in case it got lost. Any help you can provide is deeply appreciated.

I am trying to use the transformation element in the SLD to execute a WPS process (for testing purposes, it simply returns the passed in GridCoverage2D raster). The results are not the same (please see attachments). One looks more smoothed and the other one does not. They are both WW3 global, 360x181 Maximum Wave Height coverages.

I am not surprised, the code path that renders a single coverage is completely different than the one
which renders a request with a coverage and another vector layer, which in turn has further differences
from the one used in the rendering transformations.

  1. Without calling WPS process: This looks more smoothed.

http://localhost/geoserver/WW3_GLOBAL/wms?service=WMS&version=1.1.0&request=GetMap&layers=WW3_GLOBAL:global_360x181.max_wav_ht.surface&styles=1_no_wps_style&bbox=-180.0,-90.0,180.0,90.0&width=660&height=330&srs=EPSG:4326&format=application/openlayers

  1. With calling WPS process: This does not.

http://localhost/geoserver/WW3_GLOBAL/wms?service=WMS&version=1.1.0&request=GetMap&layers=WW3_GLOBAL:global_360x181.max_wav_ht.surface&styles=2_yes_wps_style&bbox=-180.0,-90.0,180.0,90.0&width=660&height=330&srs=EPSG:4326&format=application/openlayers

Could you please tell me why the pictures look that way (and perhaps how to fix it)?

There is no way to see the pictures, you’re linking to localhost.
How to fix it… compare the two code paths, and make them more similar (so a code change
is required)

Cheers
Andrea

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