[Geoserver-users] WCS Questions

GeoServer GeoServer User
1

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?

  2. 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

2

Hi Danny,

my answer to question #1 is inline…

···

On Tue, Apr 14, 2015 at 2:24 AM, Danny Cheng <dcheng@anonymised.com> 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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3

On Tue, Apr 14, 2015 at 2:24 AM, Danny Cheng <dcheng@anonymised.com>
wrote:

2. 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?

Probably, but it must also be related to how complex your footprint
geometry is

Cheers
Andrea

--

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

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549

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.

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