Thanks Simone,
That's very helpful. Any known limit to how large a pyramid
can be? I broke my data out into no more than 2500 tiles at the 0 level,
because otherwise it would fail on loading into GeoServer. Performance-wise
though it is quite good. It started as 13,000 tiles weighing in at 164GB.
Pyramids ballooned that (quite predictably) by about a third.
Because I've retiled, overlap becomes an issue with the
separate blocks. Would this be best addressed with an SLD (and how would I
write transparency and three bands.?) or should I instead set transparency
while I (re)process with gdal?
Thanks,
Steve
http://www.clemetparks.com/images/esig/cmp-ms-90x122.pngStephen Mather
Geographic Information Systems (GIS) Manager
(216) 635-3243
[email protected]
<http://www.clemetparks.com/> clevelandmetroparks.com
From: [email protected] [mailto:[email protected]] On Behalf Of Simone
Giannecchini
Sent: Tuesday, May 03, 2011 8:26 PM
To: [email protected]
Cc: [email protected]
Subject: Re: [Geoserver-users] ImagePyramid extension vs. ImageMosaic
Ciao Stephen,
the ImageMosaic is not the proper choice when for low resolutions it will
have to open hundreds of files.
So if you have more than 20/30 files that composes your mosaic then
performance goes from bad to unacceptable.
There is one thing to notice, imagemosaic can be used effectively in
conjunction with formats like ecw or mrsif (or jp2) where the size of each
file can be very big and hence you can create mosaic that are very large and
still have good performance.
The other approach is tu build up a pyramid. This time we create various
mosaics at various resolutions levels. When the resolutions decreases the
number of files decreases as well since usually the file size is fixed. The
drawback I foresee most part of the time with this approach is that it is
very good when it is really need but most part of the time, when data is
under 10/20 gigs there is no need to go under the task of creating the
pyramid.
Long story short, you might be in the case where a pyramid is needed, since
the size of the data is quite big.
Regards,
Simone Giannecchini
-------------------------------------------------------
Ing. Simone Giannecchini
GeoSolutions S.A.S.
Founder
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 962313
mob: +39 333 8128928
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
http://www.youtube.com/user/GeoSolutionsIT
http://www.linkedin.com/in/simonegiannecchini
http://twitter.com/simogeo
-------------------------------------------------------
On Mon, Apr 18, 2011 at 5:39 PM, Stephen V. Mather
<[email protected]> wrote:
It looks like, based on my reading, the image mosaic, unlike the pyramid
layer is not as good at serving large overviews, as everything is
partitioned into many tiles, but it is very good for serving the detailed
data itself and large volumes of it. Is this a correct assessment?
Steve
http://www.clemetparks.com/images/esig/cmp-ms-90x122.pngStephen Mather
Geographic Information Systems (GIS) Manager
(216) 635-3243 <tel:%28216%29%20635-3243>
[email protected]
<http://www.clemetparks.com/> clevelandmetroparks.com
From: Stephen V. Mather [mailto:[email protected]]
Sent: Monday, April 18, 2011 11:06 AM
To: [email protected]
Subject: Re: [Geoserver-users] ImagePyramid extension vs. ImageMosaic
Looks like I originally just sent this back to Simone:
Hi Simone,
For better or for worse, our users tend to expect to use the
data at all scales, although there is probably more I could do to discourage
this. As far as volume, we're talking about the 150GB-800GB range,
depending on the dataset.
Steve
http://www.clemetparks.com/images/esig/cmp-ms-90x122.pngStephen Mather
Geographic Information Systems (GIS) Manager
(216) 635-3243 <tel:%28216%29%20635-3243>
[email protected]
<http://www.clemetparks.com/> clevelandmetroparks.com
From: [email protected] [mailto:[email protected]] On Behalf Of Simone
Giannecchini
Sent: Thursday, April 14, 2011 5:06 PM
To: [email protected]
Cc: [email protected]
Subject: Re: [Geoserver-users] ImagePyramid extension vs. ImageMosaic
Ciao Stephen,
I will tell you what is my take on this.
First discriminant, you want to to show the data at all scales or just at
the small scales ?
Second discriminant, how much data are we talking about? Order of terabytes
or order of (tenth of) gigabytes?
Generally speaking I tend to avoid using a pyramid (files base or db based)
and thend to prefere a mosaic; anyway it would be great a bit more about
your use case.
Regards,
Simone Giannecchini
-------------------------------------------------------
Ing. Simone Giannecchini
GeoSolutions S.A.S.
Founder
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313 <tel:%2B39%200584%20962313>
fax: +39 <tel:%2B39%200584%20962313> 0584 962313
mob: +39 333 <tel:%2B39%20333%208128928> 8128928
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
http://www.youtube.com/user/GeoSolutionsIT
http://www.linkedin.com/in/simonegiannecchini
http://twitter.com/simogeo
-------------------------------------------------------
On Thu, Apr 14, 2011 at 5:18 PM, Stephen V. Mather
<[email protected]> wrote:
Hi All,
Looking at the options for serving large amounts of imagery,
what are the performance and practical differences between ImagePyramid and
ImageMosaic? Is there any known ceiling to 1) number of images 2) total
size and extent of images for either method?
Thanks,
Steve
http://www.clemetparks.com/images/esig/cmp-ms-90x122.pngStephen Mather
Geographic Information Systems (GIS) Manager
(216) 635-3243 <tel:%28216%29%20635-3243>
[email protected]
<http://www.clemetparks.com/> clevelandmetroparks.com
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