Martin Desruisseaux created SIS-594:
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Summary: Accept transform steps with swapped (source, target) CRS
Key: SIS-594
URL: https://issues.apache.org/jira/browse/SIS-594
Project: Spatial Information Systems
Issue Type: Improvement
Components: Referencing
Affects Versions: 1.4, 1.3, 1.2, 1.1, 1.0, 0.8, 0.7, 0.6
Reporter: Martin Desruisseaux
Assignee: Martin Desruisseaux
Fix For: 1.5
In a {{ConcatenatedOperation}}, usually the {{targetCRS}} of a step should be
the {{sourceCRS}} of the next step. But {{ConcatenatedOperation}} instances are
sometime provided with steps that need to have their source and target CRS
swapped in order to met above-cited consistency. Such cases should be
interpreted as defining the inverse transform of a step. This practice avoids
the problem of {{OperationMethod}} defined in only one direction, for example
map projections (the inverse projection is defined in the text, but no
{{OperationMethod}} instance is provided for them). Some
{{ConcatenatedOperation}} in the EPSG geodetic dataset use that pattern.
The changes need to be applied in {{DefaultConcatenatedOperation}} class. We
also need to search all usages of {{ConcatenatedOperation.getOperations()}} for
verifying if the code is robust to step with (source, target) CRS swapped.
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