On Thu, Feb 25, 2021 at 3:51 PM Ian Turton <[email protected]> wrote:

> But each individual layer is correctly defined with a bounding box and
> doesn't display anything outside it's bounds.
>

I really don't understand how this is possible, in a WMS request.
I just took a 2.18.x, the sf:dem layer, restricted its declared bounding
box, and it did nothing to the layer preview,
it's still showing the entire layer. As expected, the bbox I see there is
purely informative, GetMap ignores it and
grabs all data available.

I believe we need a bit more of explanation, seems like you're hitting an
odd behavior in the "two separate layers" case to me (they look like the
same map, I don't know how you made them display only part of it):

   - What is the coverage store?
   - Are these two separate raster sources in the same store (e..g, two
   raster layers in a geopackage)
   - Or is this "magical" bbox restriction enforced via some other
   mechanism, like GeoFence?

Generally speaking, I'm not aware of any clever bit merging two layers
coming from the same source.

Cheers
Andrea


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