positive_elevation_direction in Coordinate_​Space_​Definition

Name: positive_elevation_directionVersion Id: 1.0.0.0
Description: The positive_elevation_direction attribute provides the direction in which elevation is measured in positive degrees for an observer on the surface of a body. The elevation is measured with respect to the azimuthal reference plane. A value of UP or ZENITH indicates that elevation is measured positively upwards, i.e., the zenith point would be at +90 degrees and the nadir point at -90 degrees. DOWN or NADIR indicates that the elevation is measured positively downwards; the zenith point would be at -90 degrees and the nadir point at +90 degrees.
Namespace Id: geomSteward: geoClass Name: Coordinate_​Space_​DefinitionType: ASCII_​Short_​String_​Collapsed
Minimum Value: NoneMaximum Value: NoneMinimum Characters: 1Maximum Characters: 255
Unit of Measure Type: NoneDefault Unit Id: NoneAttribute Concept: NoneConceptual Domain: SHORT_STRING
Status: ActiveNillable: falsePattern: None
Permissible Value(s)ValueValue Meaning
 DownIndicates that the elevation is measured positively downwards, i.e. the zenith point would be at -90 degrees and the nadir point at +90 degrees.
 NadirIndicates that the elevation is measured positively downwards, i.e. the zenith point would be at -90 degrees and the nadir point at +90 degrees.
 UpIndicates that elevation is measured positively upwards, i.e., the zenith point would be at +90 degrees and the nadir point at -90 degrees.
 ZenithIndicates that elevation is measured positively upwards, i.e., the zenith point would be at +90 degrees and the nadir point at -90 degrees.