[QGIS-Developer] QGIS WCS is requesting FULL dataset?

[Radim Blazek]

I don't remember more than i wrote in comments and i don't know if it is
still necessary. Better to keep it i think, but it could be done optional.

Radim

On Oct 15, 2018 01:54, "Nyall Dawson" <nyall.dawson at gmail.com> wrote:

> On Fri, 12 Oct 2018 at 20:48, Richard Duivenvoorde <rdmailings at duif.net>
> wrote:
> > which is the whole of the Netherlands (in a 10x10 pixel output??) and
> > after that a more proper bbox.
>
> I can't explain the background here, but it seems deliberate. There's
> a comment before this request is made:
>
> "
>   // It may happen (GeoServer) that extent reported in
> spatialDomain.Envelope is larger
>   // than the coverage. Then if that larger BBOX is requested, the
> server returns
>   // request BBOX intersected with coverage box scaled to requested
> WIDTH and HEIGHT.
>   // GDAL WCS client does not suffer from this probably because it
> probably takes
>   // extent from lonLatEnvelope (it probably does not calculate it from
>   // spatialDomain.RectifiedGrid because calculated value is slightly
> different).
>
>   // To get the true extent (it can also be smaller than real if
> reported Envelope is
>   // than real smaller, but smaller is safer because data cannot be
> shifted) we make
>   // request of the whole extent cut the extent from
> spatialDomain.Envelope if
>   // necessary"
>
>  getCache( 1, mCoverageExtent, 10, 10 );
>
>
> Radim may know more and may be able to explain if this workaround is
> still necessary
>
>
> Nyall
>
> >
> > Is this supposed to go like this?
> > I reckon that (if the WCS data does not have overviews), loading the
> > whole dataset all the time is pretty intensive.
> >
> > Anybody more familiar with this can tell something about this?
> >
> > Regards,
> >
> > Richard Duivenvoorde
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