Should we do min / max double? Or the min and max for the Axis in question
...
--
Jody Garnett
On 27 June 2016 at 09:06, Andrea Aime <[email protected]> wrote:
> Hi,
> I'm playing with some 3d data with a compound CRS (EPSG:7415), built
> coupling a 2D flat CRS with
> a vertical one.
>
> Trying to render it fails in streaming renderer, because it's not possible
> to go from the 2D envelope
> of a WMS request to a 3D one... here is what's going on:
>
> 1. The code receives a request to render a map, the bbox is obviously
> expressed in a flat CRS (by WMS spec, in this case), say EPSG:4326
> 2. StreamingRenderer needs to filter on this bbox to get the data,
> sees it does not match the native CRS and tries a transformation to setup
> the filter
> 3. ReferencedEnvelope attempts a 2d to 3d transformation using
> JTS.transformTo3D... which blows up because it's trying to pivot
> though DefaultGeographicCRS WGS84_3D, but there is no transformation
> between that and EPSG:7415
>
> Now, leaving aside the notion of supporting vertical CRS transformations
> (which we don't have good support for), the main issue here is that the
> request wants to filter on a 2D area, so the reasonable approach would be
> to transform the requested envelope to the 2D component of the 3D CRS, and
> then set the z part of the query envelope to go from -INF to +INF (in other
> terms, unspecified).
>
> The current code, in the few cases where it works, goes from a 2D envelope
> to a 3D one with Z that are zero, e.g., the
> ReferencedEnvelopeTest.testTransformToWGS84 does the following one:
>
> Source: ReferencedEnvelope[130.875825803896 : 130.898939990319,
> -16.4491956225999 : -16.4338185791628]
> Target: ReferencedEnvelope3D[130.875825803896 : 130.898939990319,
> -16.4491956225999 : -16.4338185791628, 0.0 : 0.0]
>
> Filtering wise this is not useful, if really applied it would only catch
> objects that are intersecting the sea level...
>
> Cheers
> Andrea
>
> --
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