Martin Desruisseaux created SIS-161:
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Summary: CRS.isHorizontalCRS(...) should a wider range of types
Key: SIS-161
URL: https://issues.apache.org/jira/browse/SIS-161
Project: Spatial Information Systems
Issue Type: Improvement
Components: Referencing
Affects Versions: 0.4
Reporter: Martin Desruisseaux
Priority: Minor
The {{CRS.isHorizontalCRS(CoordinateReferenceSystem)}} method currently returns
{{true}} if the given CRS is a two-dimensional {{GeographicCRS}} or a
{{ProjectedCRS}}, and conservatively returns {{false}} in all other cases. We
should be able to expand the range of recognized types. One use case is a radar
station using a polar coordinate system in a {{DerivedCRS}} instance based on a
projected CRS. The problem is that we do not know if the conversion associated
to the {{DerivedCRS}} instance is performing a rotation along some horizontal
axis. For example the {{DerivedCRS}} instance could represent an inclined plane.
The proposed approach is to provide ourselves the {{MathTransform}}
implementations performing coordinate conversions between various
{{CoordinateSystem}} types, and check if the {{DerivedCRS}} instance is using
one of those types. This is not a fully generic approach, but would allows us
to go some steps further.
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