Hi Daniele,
Using the all-upper case DEFLATE value worked as you specify. Thanks a lot.
    On Thursday, April 5, 2018, 10:52:48 AM GMT+3, Daniele Romagnoli 
<daniele.romagn...@geo-solutions.it> wrote:  
 
 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.rahkonen@ 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 extensionhttps://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
 
  
 
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Temp
 
Shared with Dropbox
  |

 |

 |


  
 
Thanks.
 
  
   
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