longitude_direction in Geodetic_​Model

Name: longitude_directionVersion Id:
Description: The longitude_direction attribute identifies the direction of longitude (e.g. POSITIVE_EAST or POSITIVE_WEST) for a planet. The IAU definition for direction of positive longitude should be adopted: http://astrogeology.usgs.gov/groups/IAU-WGCCRE. Typically, for planets with prograde (direct) rotations, positive longitude direction is to the west. For planets with retrograde rotations, positive longitude direction is to the east. Generally the Positive West longitude_direction is used for planetographic systems and Positive East is used for planetocentric systems. If the data is defined with Spatial_Domain in a manner not recommended by the IAU, there is a optional Secondary_Spatial_Domain section to define a second set of bounding coordinates.
Namespace Id: cartSteward: imgClass Name: Geodetic_​ModelType: ASCII_​Short_​String_​Collapsed
Minimum Value: NoneMaximum Value: NoneMinimum Characters: 13Maximum Characters: 13
Unit of Measure Type: NoneDefault Unit Id: NoneAttribute Concept: NoneConceptual Domain: SHORT_STRING
Status: ActiveNillable: falsePattern: None
Permissible Value(s)ValueValue Meaning
 Positive EastPositive East longitudes (i.e., longitudes measured positively to the east) will be used when the bodies rotation is retrograde. Because of tradition, the Earth, Sun, and Moon do not conform with this definition. Their rotations are direct and longitudes run both east and west 180 degree, or east 360 degree.
 Positive WestPositive West longitudes (i.e., longitudes measured positively to the west) will be used when the rotation is prograde (direct).