[Geoserver-users] WCS Questions

GeoServer GeoServer User
1

Hi,

I believe that a WCS coverage must have a same number of bands and for that reason coloured and greyscale images can’t be delivered as one coverage even if Geoserver should support it. At least that was the case with WCS 1.0.0. A few years ago we had a mixture of panchromatic and colour infrared images on the same layer which is no problem for Mapserver as WMS, but for WCS we had to build two separate coverages.

-Jukka Rahkonen-

Daniele Romagnoli wrote:

···

Hi Danny,

my answer to question #1 is inline…

==
GeoServer Professional Services from the experts! Visit
http://goo.gl/NWWaa2 for more information.

Ing. Daniele Romagnoli
Senior Software Engineer

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

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On Tue, Apr 14, 2015 at 2:24 AM, Danny Cheng <dcheng@…3836…> wrote:

Hi,

  1. I have an image mosaic layer that consists of 1 band (panchromatic) and 3 band (RGB) images, if my WCS getCoverage request is over an area where both 1 band and 3 band images are present, GeoServer returns me an exception saying that it can’t deal with images that have different number of bands. Is there a way around this? Or is this intentional by design?

This is intentional by design: One of the constraints of a mosaic is that its granules should have same colorModel. This means that they should have same dataType (so you can’t have a mosaic of Float granules and Byte granules together) and same colors (so you can’t have a mosaic of Gray images and RGB images).

The strange thing is that it seems you have successfully configured a Layer with those images whilst you should have received a message like this “Skipping image YOURIMAGE because color models do not match.”, during mosaic configuration.

How did you configure your mosaic?

  1. I found that WCS performance is really poor if my image mosaic layer uses footprints to mask out blackfill. I presume the performance hit is because GeoServer is generating the transparency layer on the fly. Is this true?

Thanks,
Danny

Cheers,

Daniele

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2

Ah, that would make sense. Thanks everyone.

Daniele, to answer your question, I think you are correct in the expected behaviour as I think I have hit that before. I setup the image mosaic store first with 3 bands configured. The only reason that I can think of that I am not hitting it now is because I am actually never requesting a mosaic of images that have different number of bands together, even if the bounding box contains both types. I am requesting by feature ID in addition to bounding box, and the IDs are always image tiles from the same image. This is probably why it works.

Thanks,
Danny

···

From: Rahkonen Jukka (MML) [mailto:jukka.rahkonen@…6847…]
Sent: Tuesday, April 14, 2015 3:00 AM
To: Danny Cheng
Cc: geoserver-users@lists.sourceforge.net
Subject: Re: [Geoserver-users] WCS Questions

Hi,

I believe that a WCS coverage must have a same number of bands and for that reason coloured and greyscale images can’t be delivered as one coverage even if Geoserver should support it. At least that was the case with WCS 1.0.0. A few years ago we had a mixture of panchromatic and colour infrared images on the same layer which is no problem for Mapserver as WMS, but for WCS we had to build two separate coverages.

-Jukka Rahkonen-

Daniele Romagnoli wrote:

Hi Danny,

my answer to question #1 is inline…

==
GeoServer Professional Services from the experts! Visit
http://goo.gl/NWWaa2 for more information.

Ing. Daniele Romagnoli
Senior Software Engineer

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

AVVERTENZE AI SENSI DEL D.Lgs. 196/2003

Le informazioni contenute in questo messaggio di posta elettronica e/o nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il loro utilizzo è consentito esclusivamente al destinatario del messaggio, per le finalità indicate nel messaggio stesso. Qualora riceviate questo messaggio senza esserne il destinatario, Vi preghiamo cortesemente di darcene notizia via e-mail e di procedere alla distruzione del messaggio stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso, divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità diverse, costituisce comportamento contrario ai principi dettati dal D.Lgs. 196/2003.

The information in this message and/or attachments, is intended solely for the attention and use of the named addressee(s) and may be confidential or proprietary in nature or covered by the provisions of privacy act (Legislative Decree June, 30 2003, no.196 - Italy’s New Data Protection Code).Any use not in accord with its purpose, any disclosure, reproduction, copying, distribution, or either dissemination, either whole or partial, is strictly forbidden except previous formal approval of the named addressee(s). If you are not the intended recipient, please contact immediately the sender by telephone, fax or e-mail and delete the information in this message that has been received in error. The sender does not give any warranty or accept liability as the content, accuracy or completeness of sent messages and accepts no responsibility for changes made after they were sent or for other risks which arise as a result of e-mail transmission, viruses, etc.

On Tue, Apr 14, 2015 at 2:24 AM, Danny Cheng <dcheng@…3836…> wrote:

Hi,

  1. I have an image mosaic layer that consists of 1 band (panchromatic) and 3 band (RGB) images, if my WCS getCoverage request is over an area where both 1 band and 3 band images are present, GeoServer returns me an exception saying that it can’t deal with images that have different number of bands. Is there a way around this? Or is this intentional by design?

This is intentional by design: One of the constraints of a mosaic is that its granules should have same colorModel. This means that they should have same dataType (so you can’t have a mosaic of Float granules and Byte granules together) and same colors (so you can’t have a mosaic of Gray images and RGB images).

The strange thing is that it seems you have successfully configured a Layer with those images whilst you should have received a message like this “Skipping image YOURIMAGE because color models do not match.”, during mosaic configuration.

How did you configure your mosaic?

  1. I found that WCS performance is really poor if my image mosaic layer uses footprints to mask out blackfill. I presume the performance hit is because GeoServer is generating the transparency layer on the fly. Is this true?

Thanks,
Danny

Cheers,

Daniele

BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT
Develop your own process in accordance with the BPMN 2 standard
Learn Process modeling best practices with Bonita BPM through live exercises
http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_
source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF

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