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.romagnoli@anonymised.com 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:
- 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.
- 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 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@anonymised.com sourceforge.net]
Lähetetty: 4. huhtikuuta 2018 11:12
Vastaanottaja: geoserver-users@anonymised.com 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
Temp
Shared with Dropbox
Thanks.
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Regards,
Daniele Romagnoli
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Ing. Daniele Romagnoli
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