Last modified August 3, 2007
Print all topics in : "Supported map projections"
This azimuthal projection uses the center of the earth as its perspective point. All great circles are straight lines, regardless of the aspect. This is a useful projection for navigation because great circles highlight routes with the shortest distance.
This is a planar perspective projection viewed from the center of the globe. The projection can be any aspect.
A single point anywhere on the globe.
Polar aspect—North Pole or South Pole.
Equatorial aspect—any point along the equator.
Oblique aspect—any other point.
All meridians and the equator.
|Degrees from center (°)||Meridian distortion (%)||Latitude distortion (%)|
This projection is limited by its perspective point and cannot project a line that is 90° or more from the center point; this means that the equatorial aspect cannot project the poles, and the polar aspects cannot project the equator.
A radius of 30° produces moderate distortion, as indicated in the table above. This projection should not be used more than about 60° from the center.
All aspects—routes of navigation for sea and air.
Polar aspect—navigational maps of polar regions.
Equatorial aspect—navigational maps of Africa and the tropical region of South America.