Hi,
JPEG2000 is complicated. You can guess it by looking at the default compression
parameters of ECW JPEG 2000 SDK v3.5.0.4:
Sprofile=PROFILE0
Scap=no
Sextensions=0
Ssize={12000,12000}
Sorigin={0,0}
Stiles={12000,12000}
Stile_origin={0,0}
Scomponents=4
Ssigned=no,no,no,no
Sprecision=8,8,8,1
Ssampling={1,1},{1,1},{1,1},{1,1}
Sdims={12000,12000},{12000,12000},{12000,12000},{12000,12000}
Cycc=yes
Cmct=0
Clayers=1
Cuse_sop=no
Cuse_eph=yes
Corder=RPCL
Calign_blk_last={no,no}
Clevels=8
Cads=0
Cdfs=0
Cdecomp=B(-:-:-)
Creversible=yes
Ckernels=W5X3
Catk=0
Cuse_precincts=yes
Cprecints={128,128},{128,128},{128,128},{128,128},{128,128},{128,128},{128,128},{128,128},{64,64}
Cblk=64,64}
Cmodes=0
Qguard=1
Qabs_ranges=10,12,11,11,12,11,11,12,11,11,12,11,11,12,11,11,12,11,11,12,11,11,12,11,11
Most parameters are selectable which means that a JPEG2000 image can be
compressed literally in millions of different ways. Differend JPEG2000 SDKs use
a bit different strategies and JPEG2000 written by ECW JPEG 2000 SDK is not
necessarily best for JP2MrSID and GDAL adds its own features to the combination.
I have some very old timings about converting a lossless JPEG2000 image
(3-channel, 10000 by 10000 pixels) into GeoTIFF with different GDAL drivers and
a native Kakadu utility
GDAL-JP2KAK (Kakadu) (FWtools 2.0.4) timing: 340 seconds
GDAL-JP2ECW (ECW-JPEG2000) FWTools 2.4.7 timing: 514 seconds
GDAL-JP2MrSID FWTools 2.4.8 timing: 263
seconds
Kakadu kdu_expand timing: 194
seconds
Do not trust in these numbers but notice the big differences. All drivers are
better today. My sample image was compressed with Kakadu and obviously my
parameters were good for it. Numbers would have been different if the test
image was optimized for JP2ECW or JP2MrSID. Do your own tests but do not
generalize your results too much. Numbers may tell that some SDK is slow with
your images but the same SDK may be fast with a bit different images.
-Jukka Rahkonen-
Fernando Lacunza Prieto wrote:
Hi Jukka,
The file is made with ER Mapper. From Kdu_show I can see that the code stream
comment is ECW JPEG 2000 SDK v4.2.0.64 - Licensee: ERDAS IMAGINE/ER Mapper Pro
Unlimited
We have another JPEG 2000 made with the same software, only smaller
(207000x185680 pixels). GeoServer seems to cope with this file well.
Regards,
Fernando Lacunza
De: Rahkonen Jukka [mailto:[email protected]]
Enviado el: martes, 02 de abril de 2013 15:06
Para: '[email protected]'
Asunto: Re: [Geoserver-users] Performance with huge JPEG2000
Hi,
Could you send information about how your JPEG2000 image is created? You can
for example download Kakadu demo programs from
http://kakadusoftware.com/index.php?option=com_content&task=view&id=26&Itemid=22
and open your image with Kdu_show. From File - Properties menu item you will
find lots of useful information.
If you need another JPEG2000 as a reference you can try to get a Finnish
topomap from here
http://laillisettorrentit.net/index.php?page=torrent-details&id=ef25a0ea9b876bf963ec7a88f1a3557c1328d852
It is open data under attribution only license but the torrent is not very
active.
-Jukka Rahkonen-
Fernando Lacunza Prieto wrote:
Hello everyone,
I have a really big JPEG2000 file (598240x638720 pixels, about 54 GB) published
in a WMS by GeoServer 2.2 and the GDAL extension. The file is accessed with a
JP2MrSID store. The purpose of that WMS is to serve tiles to MapProxy to build
a WMTS cache.
Unfortunately, the performance is appalling: each GetMap request lasts 10 to 15
seconds, and after that GeoServer stops responding for another 15 to 20
seconds. At this rate, my WMTS cache would be done in about 5 years, and I do
not want to wait so long.
¿Is there some tweaking I can do to increase the performance to acceptable
levels? I am a newbie in both GeoServer and MapProxy, and I fear that my
approach to the problem could be wrong. Therefore, any suggestions to
accomplish the task of building a restful WMTS cache from a JPEG2000 file are
welcome.
Thanks!
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