Standard Coordinate Systems

 

The projection specification for a coordinate system has the form "filename:zone", where the file name is the name of the definition file, chosen from the following list:

 

File Name	Description
nad27	NAD27 Coordinate Systems for U.S. and Canada
nad83	NAD83 Coordinate Systems for U.S. and Canada
userprj	User-Defined Coordinate Systems (not included with Maptitude)
world	World Coordinate Systems (other than U.S. and Canada)

 

These files are stored in the Maptitude program folder (see User-Defined Coordinate Systems for more information on creating your own userprj file). Each definition file contains definitions for a number of coordinate systems and may be viewed with a text editor. Lines that begin with a number sign (#) are comment lines. Each definition starts with the zone identifier, which is a number or name enclosed by < > brackets. Use these identifiers to specify a zone in the "filename:zone" projection specification.

 

Meters are the default units. The "units=abbr" option string is required if units other than meters are used:

 

Examples

// 1927 State Plane for New York West

...

{"Projection", "nad27:3103", {"units=us-ft"}} // Standard U.S. Feet

...

 

// 1983 State Plane for Puerto Rico and the U.S. Virgin Islands

...

{"Projection", "nad83:5200", } // defaults to meters

...

 

// Japan zone 11

...

{"Projection", "world:japan-11", {"units=km"}} // Kilometers

...