Hi,
I wonder what the sub-coverages in the OGC Coverage Implementation Schema (CIS)
will add to the soup https://portal.opengeospatial.org/files/64632
-Jukka Rahkonen-
Andrea Aime wrote:
On Sat, May 21, 2016 at 11:59 AM, Ben Caradoc-Davies
<[email protected]<mailto:[email protected]>> wrote:
On 21/05/16 20:41, Andrea Aime wrote:
On Fri, May 20, 2016 at 10:39 PM, Ben Caradoc-Davies
<[email protected]<mailto:[email protected]>>
wrote:
I think that coverage aggregation in NetCDF might be a job for WPS.
Ah, WPS, the one protocol to rule them all :-)
And in the darkness bind them. :-)
Muwhaahhahahahaa!!!!
(but seriously, I agree it's the only fully compliant option, the other
potential avenue being making a vendor extension to the WCS standard)
Yes, that could work. Perhaps supporting a comma-separated list of coverage
IDs, and then aggregating them on output? A bit fiddly if the underlying
coverages have different dimensions and coordinate variables, but it could be
done. Extending WCS would mean that the method for obtaining an aggregated
coverage would be very similar to the method for obtaining a single coverage.
Right. To be honest, I'm not against the idea.
The major argument against would be, I guess, how can a client know if an
output format is multi-coverage capable, and what conditions do the
multi-coverages have to respect? (nothing, same CRS, same data type, and so on?)
But to be honest, we go out with arcgrid, how does a client know that arcgrid
is not multiband capable?
Given that only a geoserver specific client would know that coverageid might
take a comma separate list of values,
the worry about output format seems moot, it seems to me the client would have
to be custom-made regardless.
The interesting part is imho another, how does one allow multi-coverage without
too deep changes in the WCS 2.0
machinery? I'd say, by having DefaultWebCoverageService20 loop over the ids,
getting a response out of each,
and then build a new multi-coverage response object that only netcdf knows how
to handle:
https://github.com/geoserver/geoserver/blob/master/src/wcs2_0/src/main/java/org/geoserver/wcs2_0/DefaultWebCoverageService20.java#L138
Cheers
Andrea
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