Is there a way with the current set of APIs (looks like some are in flux
with opengis) to instantiate a CoordinateReferenceSystem for a
particular UTM zone.
There is no explict API for doing this task. However, if you are using the EPSG database, you can
use the following trick. A look in the EPSG database show that there is a logic between EPSG code
and UTM zone. For example
32601 WGS 84 / UTM zone 1N
32602 WGS 84 / UTM zone 2N
32603 WGS 84 / UTM zone 3N
32604 WGS 84 / UTM zone 4N
32605 WGS 84 / UTM zone 5N
32606 WGS 84 / UTM zone 6N
...
32701 WGS 84 / UTM zone 1S
32702 WGS 84 / UTM zone 2S
32703 WGS 84 / UTM zone 3S
32704 WGS 84 / UTM zone 4S
32705 WGS 84 / UTM zone 5S
32706 WGS 84 / UTM zone 6S
...
There is also similar code ranges for UTM using WGS72, NAD27, ED50, etc. datum.
So you can use for example:
int utm_zone = 10;
CRSAuthorityFactory f = FactoryFinder.getCRSAuthorityFactory("EPSG", null);
crs = f.createCoordinateReferenceSystem("EPSG:" + (32600 + utm_zone));
Martin.
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