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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SIS-353) UTM should take in account Norway and Svalbard special cases
Date Thu, 16 Feb 2017 06:49:44 GMT
Martin Desruisseaux created SIS-353:
---------------------------------------

             Summary: UTM should take in account Norway and Svalbard special cases
                 Key: SIS-353
                 URL: https://issues.apache.org/jira/browse/SIS-353
             Project: Spatial Information Systems
          Issue Type: Improvement
          Components: Referencing
    Affects Versions: 0.7
            Reporter: Martin Desruisseaux
            Assignee: Martin Desruisseaux
             Fix For: 0.8


The Universal Transverse Mercator (UTM) is not strictly divided in 6° width zones. There
is exceptions for Norway and Svalbard, for historical reasons (UTM seems to have been designed
by military around World War II).

* Between 56°N and 64°N, zone 32 is widened to 9° (at the expense of zone 31) to accommodate
southwest Norway.
* Between 72°N and 84°N, zones 33 and 35 are widened to 12° to accommodate Svalbard. To
compensate for these 12° wide zones, zones 31 and 37 are widened to 9° and zones 32, 34,
and 36 are eliminated.

Since the {{CommonCRS.UTM(double, double)}} method already expect latitude and longitude,
it can easily be fixed without API change. However it would be a slight change in its behavior.
An alternative is to deprecate the current {{UTM(double, double)}} method and create a new
{{universal(double, double)}} method instead. That {{universal}} method would handle not only
the Universal Transverse Mercator (UTM) case with its special cases, but also Universal Polar
Stereographic (UPS) cases.



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