Geographic Coordinate System

 

World Map

Unprojected Lat/Long

 

Projection Characteristics

This is a simplistic cylindrical projection. If the coordinates in a Didger map are stored in a geographic coordinate system (also known as Unprojected Lat/Long or latitude/longitude), the map is displayed on the screen by simply treating the longitudes as horizontal offsets and the latitudes as vertical offsets.

 

When plotting latitude/longitude coordinates, Didger constructs the map coordinate system by first determining the latitude for the center of the map. Then the appropriate scale is determined for the east-west (longitude) relative to the north-south (latitude) dimension of the map. See latitude/longitude and Using Scaling to Minimize Distortion on Latitude/Longitude Maps for more information on relative scaling of latitude versus longitude.

 

The features of a geographic coordinate system (Unprojected Lat/Long) map are:

 

There are no parameters for this projection.

 

 

See Also

Introduction to Map Projections

Geometric Forms of Projection

Characteristics of Projections

Datums

Ellipsoids

Change Projection

Latitude/Longitude Coordinates

Latitude/Longitude in Decimal Degrees

Using Scaling to Minimize Distortion in Latitude/Longitude Projects

Projection References