Universal Transverse Mercator (UTM)

The projection name is "utm" for a UTM zone. The zone is specified:

• Explicitly by using then "zone=num" option string

• Implicitly by using the "lon_0=lon" option string, to determine the correct zone from the longitude (lon).

The "south" option string will add a 10,000,000 meter False Northing, which is used in the Southern Hemisphere.

If units other than meters are used, then the "units=abbr" option is required.

The default ellipsoid is the Clarke 1866 ellipsoid. To indicate another ellipsoid, either use the "ellps=abbr" option string for a recognized ellipsoid or define a custom ellipsoid.

Examples

// For Massachusetts

...

{"Projection", "utm", {"zone=19", "units=us-ft"}}

...

// For the Southern Hemisphere

...

{"Projection", "utm", {"ellps=GRS67", "zone=18", "south"}}

...