Hi Christian,
ah ok. My original data is GeoTIFF 800 images á 10.000 x 10.000 pixels RGB with
300 MB of each image. If I try to create one big GeoTIFF using gdal_retile I
got a memory exception… ;)
if you have some linux scripts I like to look inside the scripts and hope that
I can find some code snips which helps me to configure my geoserver in the
right point of view.
Thanks.
André
Von: Christian Mueller [mailto:christian.muel...@os-solutions.at]
Gesendet: Donnerstag, 30. April 2015 17:40
An: Mende, Andre
Cc: geoserver-users@lists.sourceforge.net
Betreff: Re: [Geoserver-users] WG: ImageMosaicJDBC problem: geoserver stop
waiting before postgres send the raster information
Hi Andre
I meant one big GeoTIFF (no use of gdal_retile) with internal compression,
tiles , overviews and the CRS. This setup works pretty well for my customers.
At the end of the day, you have only one geotiff file and GeoServer works very
good with a geotiff file (my experience).
Maybe I can send you some Linux scripts I am using.
What format is your original data ?
Cheers
Christian
On Wed, Apr 29, 2015 at 9:49 AM, Mende, Andre
<andre.me...@landkreis-zwickau.de<mailto:andre.me...@landkreis-zwickau.de>>
wrote:
Hi Christian again,
Your question was: Did you consider to create one big geotiff file with inner
tiling and overviews ?
I addition to my last post I will ask you something about big GeoTIFF with
inner tilling and overviews.
Do you mean that I have to create for every tile of my gdal_retile result a
inner tilling and overview or should I make one big GeoTIFF (165 GB, maybe 20
GB if I reduce with JPEG-compression) without using gdal_retile?
Thanks.
André
Hi Christian and Andrea,
thank you both for your response.
I had used gdal_retile with different pixelsizes 1000x1000, 2000x2000,
5000x5000.
I am interested in the best configuration as a balance between number of rows
in database for each pyramidal step and the size of the real image.
@ Andrea:
Do you have this paper of Paul Ramsey or a link with the full results?
@ Christian:
Is it faster if I use the raster-column in a function like st_envelope to get
the bounds or maybe we should use a extra column with the geometry bounds
because a raster is a fixed information without dynamic change of the borders?
In my opinion I think it is faster to ask the database whether a point is
inside a bounding box (geometry column) instead of using a full raster and
calculate the borders every time…
Another point: Is there a opportunity only use Image Links in database using
ImageMosaicJDBC? (please look at the answer of Andrea last mail)
Now I compress my source images using gdal_retile including compression
attribute because i will find the right balance between resolution and image
size.
If the process is ready I will tell you some result information. In addition I
will test a 32 bit server with JAI and a 64 bit server without JAI which is
faster or what´s the differences.
Thanks.
André
Von: Christian Mueller [mailto:christian.muel...@os-solutions.at]
Gesendet: Dienstag, 28. April 2015 11:43
An: Andrea Aime
Cc: Mende, Andre;
geoserver-users@lists.sourceforge.net<mailto:geoserver-users@lists.sourceforge.net>
Betreff: Re: [Geoserver-users] ImageMosaicJDBC problem: geoserver stop waiting
before postgres send the raster information
Hi Andre
Did you consider to create one big geotiff file with inner tiling and
overviews ?
I think this is the simplest way to support image data.
And here is the Swiss army knife you may need
http://www.gdal.org/
Cheers
Christian
On Mon, Apr 27, 2015 at 4:45 PM, Andrea Aime
<andrea.a...@geo-solutions.it<mailto:andrea.a...@geo-solutions.it>> wrote:
On Mon, Apr 27, 2015 at 4:24 PM, Mende, Andre
<andre.me...@landkreis-zwickau.de<mailto:andre.me...@landkreis-zwickau.de>>
wrote:
Hi Christian,
yes there are write priveleges… but i will look at this again and tell you the
answer.
Now some additional ideas/questions would like to discuss.
A GeoServer-user will use this software with high speed and a useful
configuration.
Therefore it is very important to know whether a 32 bit geoserver using the jai
is faster then a 64 bit geoserver without using jai.
The difference in performance between native and non native jai is probably not
very relevant given you setup a poorly performing environment to start with:
* GeoServer on Windows server is a good 30% slower than on Linux, on the same
hardware (and other GIS software is too, not specific to GeoServer)
* Keeping raster in PostGIS is slower than keeping it on the file system (Paul
Ramsey reiterated that at FOSS4G-NA a few months ago, "keep rasters
in the database only to perform spatial analys, not to serve them on the web)
* Postgis raster does not have native overviews (they are going to be added in
the next version), although the imagemosaicjdbc can probably help here, since
it can work as a image pyramid plugin too
Cheers
Andrea
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