Martin Desruisseaux created SIS-535:
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Summary: Search for coordinate operations create too many CRS
Key: SIS-535
URL: https://issues.apache.org/jira/browse/SIS-535
Project: Spatial Information Systems
Issue Type: Improvement
Components: Referencing
Affects Versions: 1.1, 1.0, 0.8
Reporter: Martin Desruisseaux
Assignee: Martin Desruisseaux
Fix For: 1.2
A call to {{CRS.findOperation(souceCRS, targetCRS, …)}} sometime cause an
excessively large scanning of EPSG database in search for similar CRS. The
problem is especially acute when one of the CRS is a Transverse Mercator
projection, in which case SIS starts to instantiate all Transverse Mercator
projection declared in the EPSG database using the same datum (there is
potentially hundreds of them). SIS does that in case better coordinate
operations can be found in the EPSG database for CRS that are equivalent but
with different axis order (e.g. EPSG::4171 versus EPSG::7084). However this
apply mostly to geographic CRS. Applying this search for all kinds of CRS, in
particular projected CRS, may be an overfill.
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