On Tue, Feb 9, 2016 at 6:21 PM, César Martínez Izquierdo <
cesar....@gmail.com> wrote:
> We are interested on improving the behaviour of Geoserver regarding the
> management of raster statistics, which currently seems to be broken in
> several senses:
>
> a) It is not possible to update raster statistics using REST API (see
> message [1] on mailing list)
>
This one is easily fixed, given enough time to work it.
>
> b) Geoserver apparently fails to (or doesn't make any effort to) read
> raster statistics even if they are present of the raster data source (at
> least for GeoTiff)
>
Does GeoTiff have statistics built in? First time I hear about it?
Or are you talking about the GDAL statistics file (a xml file normally),
which is not part of any standard?
Indeed the code is not making any effort to read it.
When you talk about statistics do you mean just min and max, or an
histogram?
And where would you expect to see the results of this calculation? Right
now I believe they are showing up only in WCS outputs as far as I know
(and assuming you're not talking about a histogram, which won't show up
anywhere).
>
> c) Geoserver apparently is not able to compute raster statistics from the
> data source
>
It is not indeed, but it has the machinery necessary to do it. What is
worrysome about it is that some data
sources are several terabytes of data (or more), calculating full
statistics on them might require hours or days.
Seems like a job for a WPS process, that can be called asynchronously, at
least for large datasets.
>
> We intend to correct a) in the sort term (meaning: now), but we might also
> be interested on b) and c) on the long term depending on the required
> effort.
>
> For c), I envisage a parameter on REST requests for coverages which forces
> the (re)calculation of statistics. For instance:
> POST /workspaces/<ws>/coveragestores/<cs>/coverages[.<format>]?stats=yes
> (when uploading the coverage)
> GET
> /workspaces/<ws>/coveragestores/<cs>/coverages/<c>[.<format>]?stats=yes
> (for an already published coverage)
>
> Do you think it could be a good approach?
>
For small datasets yes, for larger ones a synchronous request might take
too much time
Cheers
Andrea
--
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