Class Name: GD Location 2D

Superclass - Location 2D

Definition

A coordinate within the Geodetic (GD2) 2D Spatial Reference Frame (SRF).

The Geodetic 2D 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.

The canonical 2D Local Tangent Plane (LTP2) space, when embedded in a GD2 SRF, would have its X axis aligned with the local parallel of the GD2 SRF, and its Y axis aligned with the local meridian of the GD2 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 UPS SRF.

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

Primary Page in DRM Diagram:

• 15

Example

1. A Feature Node representing Cinderella's Castle at Walt Disney World in Orlando, Florida might have a GD Location 2D with geodetic_latitude = 28.25, geodetic_longitude = 81.35.

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

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