I believe it would be nice/useful to have information about the M at the
GeometryDescriptor level,
like done in this commit for the dimensions:
https://github.com/geotools/geotools/commit/a9c4b52c0404ec0357d0006ce8900c209875ec9a
but during a discussion you reported that the info is not always available
and/or we might have
a mix of mesured and non measured geometries, could you elaborate?
On Tue, Jul 31, 2018 at 2:11 PM Nuno Oliveira <
[email protected]> wrote:
> I ended up having CoordianteSequence.getDimension() as described in the
> conversation above, and
> CoordianteSequence.getMeasures() being the number of measures (so if we
> have
> XYZM dimension is 4 and measures is 1.
>
This would be a new method in a GeoTools "trait" interface that only some
CoordinateSequences would
implement?
> 1. correctly read geometries with measurements from data sources
> 2. correctly encode the measurements in the output formats
> 3. correctly handling measurements when doing certain operations, e.g.
> re-projections
>
Have a look here:
https://github.com/geotools/geotools/blob/9fbd02a320fa19d563972808d226a0a0445a5b13/modules/library/api/src/main/java/org/geotools/geometry/jts/DefaultCoordinateSequenceTransformer.java#L61
> The following issue in GeoServer as an interesting discussion about this:
>
> https://osgeo-org.atlassian.net/browse/GEOS-8858
Yep, some output formats are allergic to M and we'd have to decide if to
return it as a vendor extension (much like the way
we handle 2.5D data declaring a 2D CRS) and others allow loopholes but
again not all clients might understand.
Cheers
Andrea
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