[gdal-dev] WCS 2.0, getting (multidimensional) data

[Ari Jolma]

Even Rouault kirjoitti 03.11.2017 klo 11:07:
>
> > 1) My understanding is that there are potentially three CRS in
>
> > operation: the CRS of the bbox of the coverage (the native CRS of the
>
> > server); the CRS of the grid; and the CRS where the user wants the data.
>
> > I can imagine that it is perfectly possible for a server to advertise
>
> > data from an area bounded by geographic coordinates, and that the data
>
> > is in some specific projected coordinate system.
>
> For me the "native" CRS (as much as a client can see) is the one of 
> the CoverageDescription.boundedBy.Envelope at srsName attribute
>

exactly

> . If the server advertizes it as EPSG:4326, but the native data is in 
> something else, this is an implementation detail of the server. That 
> said, as you mention, the user could then decide to request in that 
> alternative CRS if it has knowledge of that.
>
> > Also, the data could be
>
> > regular but not east-north (it is rotated for example). This would be
>
> > described in a CoverageDescription. Despite the rotation, GDAL would
>
> > show the data east-nort (without rotation), since only the bbox of the
>
> > coverage is given.
>
> You should be able to retrieve the rotation/shearing terms in the 
> domainSet.RectifiedGrid.offsetVector 's element similarly to other WCS 
> versions
>

yes, and that is needed to compute (approximate) the size of the GDAL 
dataset raster, as I just wrote in another reply to this thread.

Ari

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