Rendering and Illumination - Autodesk AutoCAD 2013 Practical 3D Drafting and Design - page 328

When creating or editing a geographic location, a new box is displayed with the fol-
lowing areas (displayed in the following image):
• Latitude & Longitude : The first list allows us to choose latitude and
longitude coordinates between decimal values, or degrees / minutes /
seconds. In Latitude , we enter latitude value, between -90 degrees and
+90 degrees, and related to North or South . In Longitude , we enter the
longitude value, between -180 degrees and +180 degrees, and related
to West or East . The Use Map button displays a new box to specify the
location. This can be done directly on the map displayed by selecting from
Region , or from the Nearest City list. The Time Zone list allows us to
choose the time zone corresponding to the chosen location. If Nearest
Big City is on, when picking on the map, the location jumps to the nearest
city.
• Coordinates and elevation : In this area, we specify the drawing coordin-
ates and elevation where the geographic location mark will be placed.
• North direction : We define the north direction, related to the Y axis of
the world coordinate system ( WCS ). If not modified, the north direction
is given by the Y axis of the WCS.
• Up direction : We define which axis of the world coordinate system is ver-
tical.