Class Name: GD Location 3D

Superclass - Location 3D

Definition

A coordinate within the Geodetic (GD) 3D Spatial Reference Frame (SRF).

The Geodetic Spatial Reference Frame is based on latitude and longitude on the surface of the Object Reference Model/Earth Reference Model (ORM/ERM).

Latitude is defined to be the angle in arc degrees subtended with the ORM/ERM equatorial plane by a perpendicular through the surface of the ORM/ERM from a point. Latitude is positive if north of the equator, negative if south.

Longitude is defined to be the angle in arc degrees measured about the polar axis of the ORM/ERM from a prime meridian to the meridian through a point; positive if east of the prime meridian and negative if west. Longitude on the ERM is conventionally defined with respect to the Prime Meridian of Greenwich, England.

Elevation is defined along the local normal to the vertical datum, with an origin at the vertical datum and positive with increasing distance from the ORM/ERM mass-center.

The canonical 3D Local Tangent Plane (LTP) space, when embedded in a GD SRF, would have its X axis aligned with the local parallel of the GD SRF, and its Y axis aligned with the local meridian of the GD SRF. The poles are treated as special cases, where:

North pole	+X axis = 90 degree east meridian
+Y axis = 180 degree meridian
South pole	+X axis = 90 degree west meridian
+Y axis = 0 degree meridian

These are defined consistent with the AUPS SRF.

See the SEDRIS Spatial Reference Model (SRM) for additional details.

Primary Page in DRM Diagram:

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Example

1. A Feature Node representing Cinderella's Castle at Walt Disney World in Orlando, Florida might have a GD Location 3D with geodetic_latitude = 28.25, geodetic_longitude = 81.35, and elevation = 0.0.

FAQs

Constraints

• Environment Root Spatial Reference Frame
• Locations Under Model

Component of (one-way)(inherited)

• optionally, some Arcs
• optionally, some Base Perimeter Data
• optionally, some Base Reference Vectors
• optionally, some Directional Light Behaviors
• optionally, a Distance Level of Detail Data (notes)
• optionally, some Ellipses
• optionally, some Elliptic Cylinders
• optionally, some Feature Edges
• optionally, a Feature Node
• optionally, some Image Anchors
• optionally, some Labels
• optionally, a Location Table
• optionally, some Morph Points
• optionally, some Point Geometries
• optionally, some Property Grid Hook Points
• optionally, a Reference Origin
• optionally, some Spatial Domains
• optionally, some Spatial Index Related Feature Topologies
• optionally, some Spatial Index Related Features
• optionally, some Spatial Index Related Geometries
• optionally, some Tack Points
• optionally, some Vertices
• optionally, some Vertex with Component Indices
• optionally, some World 3X3s
• optionally, some World Transformations
• optionally, an Attachment Point
• optionally, some Center of Buoyancies
• optionally, some Center of Mass
• optionally, some Center of Pressures
• optionally, a Contact Point
• optionally, some Positional Lights
• optionally, some Separating Planes
• optionally, some Sound Instances
• optionally, some Stamp Behaviors
• optionally, some Volumes
• optionally, some Volume Level of Detail Data
• optionally, some Volume Light Behaviors

Field Elements

Notes

Component of Notes

Distance_Level_of_Detail_Data

 the center point for the LOD test

Fields Notes

geodetic_longitude

 in degrees

geodetic_latitude

 in degrees

elevation

 Elevation or height; positive "outwards" along the direction
 normal to the ORM/ERM