Martin Desruisseaux created SIS-359:
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Summary: Support coordinate transformations between CRS having
duplicated axis orientations
Key: SIS-359
URL: https://issues.apache.org/jira/browse/SIS-359
Project: Spatial Information Systems
Issue Type: Improvement
Components: Referencing
Affects Versions: 0.7, 0.6
Reporter: Martin Desruisseaux
Assignee: Martin Desruisseaux
Priority: Minor
Coordinate systems are usually not allowed to have two axes with the same
orientation. For example it is considered an error to have two axes oriented
toward East. But there is at least two exceptions to this rule:
* {{AxisDirection.OTHER}}: there is actually no way to know which direction it
is, so two {{OTHER}} orientations may be actually different directions.
* {{AxisDirection.FUTURE}}: meteorological data can have two time axes. For
more information, see [OGC Best Practice for using Web Map Services (WMS) with
Time-Dependent or Elevation-Dependent
Data|http://www.opengis.net/doc/bp/wms-tnz/1.0] (OGC 12-111r1).
Currently, attempt to transform two CRS having duplicated axis orientation
produces an exception like below:
{noformat}
org.opengis.util.FactoryException: Ne peut pas créer l’objet géodétique pour «
CompoundCRS[“grib-lonlat-crs+Java…”] → CompoundCRS[“grib-lonlat-crs+Java…”] ».
at
org.apache.sis.referencing.operation.CoordinateOperationFinder.createOperation(CoordinateOperationFinder.java:206)
at
org.apache.sis.referencing.operation.DefaultCoordinateOperationFactory.createOperation(DefaultCoordinateOperationFactory.java:750)
at org.apache.sis.referencing.CRS.findOperation(CRS.java:610)
... 22 more
Caused by: java.lang.IllegalArgumentException: Les directions d’axes Other
et Other sont colinéaires.
at
org.apache.sis.referencing.operation.matrix.Matrices.createTransform(Matrices.java:267)
at
org.apache.sis.referencing.operation.matrix.Matrices.createTransform(Matrices.java:440)
at
org.apache.sis.referencing.cs.CoordinateSystems.swapAndScaleAxes(CoordinateSystems.java:280)
at
org.apache.sis.referencing.operation.CoordinateOperationFinder.createOperation(CoordinateOperationFinder.java:204)
... 26 more
{noformat}
One possible approach may be to remember the indirect association between axes
and CRS during the computation performed by {{Matrices.createTransform(…)}}. If
two axes have the same axis direction but we can still distinguish the axes by
the enclosing CRS instance, then we can avoid throwing the exception.
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