Hi Mustafa,
On Wed, Apr 4, 2018 at 5:48 PM, Mustafa ÖZÇETiN via Geoserver-users <
geoserver-users@lists.sourceforge.net> wrote:
> Hi Jukka,
>
> Thanks for the response. Adding the "&compression=LZW" parameter to the
> end of the WCS GetCoverage request sends a compressed GeoTIFF that I expect.
>
> Some observations:
>
> 1) When I use the "Deflate" value as the compression parameter, GeoServer
> returns a service exception saying "Provided compression does not seem
> supported".
>
Looking from the code, you may want to try with "DEFLATE", all upper-case.
I will open a JIRA to make sure the value defined in the specification [1]
is supported too.
>
> 2) When I try the "&geotiff:compression=LZW" parameter, GeoServer does not
> return any exceptions but sends an uncompressed GeoTIFF (with GeoServer
> 2.9.2).
>
I think that the "geotiff:" prefixes have been added from 2.11 as part of
this JIRA, so 2.9.2 is not supporting them yet:
https://osgeo-org.atlassian.net/browse/GEOS-8555
[1]: https://portal.opengeospatial.org/files/?artifact_id=54813 [Page 16,
Table 2]
Hope this helps.
Regards,
Daniele
>
> On Wednesday, April 4, 2018, 5:10:03 PM GMT+3, Rahkonen Jukka (MML) <
> jukka.rahko...@maanmittauslaitos.fi> wrote:
>
>
> Hi,
>
>
>
> There is nothing strange with that. Your original image is compressed with
> “deflate” and if you expand it into uncompressed format with gdal_translate
> (gdal_translate 1201.tif expand.tif) the file size seems to grow into
> 324626939 bytes. WCS by default sends coverages as uncompressed.
>
>
>
> Read about WCS 2.0 GeoTIFF extension https://portal.opengeospatial.
> org/files/?artifact_id=54813 and ask Geoserver to send you a compressed
> image by adding the required parameter &compression=Deflate. Using also
> &predictor=Horizontal probably yields even smaller output.
>
>
>
> BTW. according to the standard the parameters should be
> &geotiff:compression=Deflate&geotiff:predictor=Horizontal but older
> Geoserver versions do not handle the “geotiff:” part. Geoserver 2.13 and
> 2.14 support both variants but users should learn to use the correct
> geotiff: prefixed syntax as soon as possible because that is the correct
> format and required by other WCS servers.
>
>
>
> -Jukka Rahkonen-
>
>
>
> *Lähettäjä:* Mustafa ÖZÇETiN via Geoserver-users [mailto:
> geoserver-users@lists.sourceforge.net]
> *Lähetetty:* 4. huhtikuuta 2018 11:12
> *Vastaanottaja:* geoserver-users@lists.sourceforge.net
> *Aihe:* [Geoserver-users] GeoServer Web Coverage Service Issue
>
>
>
> Hi,
>
>
>
> I have a strange behaviour with GeoServer WCS. I am using a GeoTIFF image
> with WCS. The image contains terrain type data like land/sea etc. The
> original size of the image is just 939 KB but when I download this image
> from WCS it becomes 309 MB! How can a GeoTIFF file expands its size to 300+
> times after downloaded from WCS?
>
>
>
> System info:
>
>
>
> JRE 8
>
> GeoServer 2.9.2
>
> WCS 2.0.1
>
>
>
> You can download and inspect the image with the following link:
>
>
>
> Temp
> <https://www.dropbox.com/sh/jja0si9jbgycb8i/AACtxeCZiKftGC1yN3g33SOga?dl=0&preview=1201.tif>
>
>
>
>
>
> [image: Tekstiruutu:]
>
> [image: Lähettäjä poisti kuvan.]
> Temp
>
> Shared with Dropbox
>
>
>
> Thanks.
>
>
>
> ------------------------------------------------------------
> ------------------
> Check out the vibrant tech community on one of the world's most
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> _______________________________________________
> 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-
> requesting-and-integrating-new-features-and-improvements-in-GeoServer
>
>
> Geoserver-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/geoserver-users
>
>
--
Regards,
Daniele Romagnoli
==
GeoServer Professional Services from the experts! Visit http://goo.gl/it488V
for more information.
==
Ing. Daniele Romagnoli
Senior Software Engineer
GeoSolutions S.A.S.
Via di Montramito 3/A
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
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Please make sure you read the following two resources before posting to this
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