···
On Tue, May 31, 2016 at 12:10 PM, Andrea Aime <andrea.aime@anonymised.com> wrote:
Hi,
I am looking into dynamic color maps these days for the ncwms integration (since it’s really the same
problem with different syntax).
The current module offers a fiilter function providing a PAMDataset if available, which originates from
a GDAL statistics file (a .aux.xml one) if available.
As per our internal discussion I am not a fun of this approach as it exposes a low level, software specific representation of statistics while we should have a first class object.
I would consider improving this as part of this work, but I would delay until the end and we concentrate first on the functionality we are seeking.
At the end I would consider the possibility to:
-1- introduce a first class statistics object in GeoTools CoverageReader
-2- Have that read GDAL Stats depending on the format
-3- Introduce the ability to compute and persist stats in GeoServer when they are not available from the underlying store. This one is tougher as it might need to be implement asynchronously or large rasters.
For my work I want to use something easier to control for the admin as the default value for the min/max
ranges, and in particular the ones configured band by band in the geoserver layer panel (min/max range),
so that people can edit them without having to drop on the command line:
![Inline image 1]()
Now, that normally comes with the full range of the datatype (we do not run stats on coverage creation),
but if the GDAL stats are already there, I want to use it instead to populate the min/max range.
Agreed, see my point above for future plans.
Of course it would also be nice to have a button to compute it on the fly from the data itself but…
against a large mosaic that would take hours. Implementing this would go beyond the time I have
available (pity).
Again, see above. Let’s start simple and then revisit.
Anyways, any objection to using the GDAL stats when they are available?
Not from me, I just would like to have better isolation/abstraction in GeoTools/GeoServer from format/plugin specific representations of statistics like the GDAL Pam ones which we are using right now.
Cheers
Andrea
–
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