[jira] [Created] (SIS-431) Need MD_ReferenceSystem adapter

["Martin Desruisseaux (JIRA)" <ji...@apache.org>]

Martin Desruisseaux created SIS-431:
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             Summary: Need MD_ReferenceSystem adapter
                 Key: SIS-431
                 URL: https://issues.apache.org/jira/browse/SIS-431
             Project: Spatial Information Systems
          Issue Type: Task
          Components: Metadata
            Reporter: Martin Desruisseaux
            Assignee: Martin Desruisseaux
             Fix For: 1.0


Coordinate Reference Systems (CRS) are defined in details by the ISO 19111 classes in GeoAPI {{org.opengis.referencing.*}} packages. But the ISO 19115 metadata standards do not reference those CRS classes directly (except in one case). Instead the metadata standards reference CRS by their identifier (for example an EPSG code), optionally accompanied by a code telling whether the CRS type is geographic, projected, temporal, a compound of the above, _etc_. Those two information are combined in a {{MD_ReferenceSystem}} class referenced by the following properties:

||Class||Association to {{MD_ReferenceSystem}}||Association to a {{CRS}} subtype
|{{MD_Metadata}}|{{referenceSystemInfo}}| |
|{{LI_Source}}|{{sourceReferenceSystem}}| |
|{{EX_VerticalExtent}}|{{verticalCRSId}}|{{verticalCRS}}
|{{MI_GCPCollection}}|{{coordinateReferenceSystem}}| |

In order to have a more uniform way to handle reference systems, GeoAPI replaces those (_identifier_, _type code_) tuples by associations to the actual _Reference System_ objects.
GeoAPI does that by using the {{ReferenceSystem}} interface as the parent of {{CoordinateReferenceSystem}} interface.

However current Apache SIS implementation of {{MD_ReferenceSystem}} JAXB adapter marshalls the full CRS, which is not the expected behavior except in the {{verticalCRS}} case. We need to modify this adapter for marshalling only the identifier and the {{MD_ReferenceSystemTypeCode}} instead.

In the particular case of {{VerticalExtent}}, the proposal is to marshal the {{verticalCRSId}} if an EPSG code is available, or {{verticalCRS}} otherwise.



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