[SIS-161] CRS.isHorizontalCRS(...) should recognize a wider range of types

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 0.4, 0.5, 0.6, 0.7, 0.8
• Component/s: Referencing
• Assignee: Unassigned
• Reporter: Martin Desruisseaux
• Created: 29/Jan/14 12:13
• Updated: 11/Oct/17 16:58

Description

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.

Issue Links

• is depended upon by: SIS-204 Verify CompoundCRS restrictions at format time