Class Name: LTP Location 2D

Superclass - Location 2D

Definition

A coordinate within the Local Tangent Plane (LTP2) 2D Spatial Reference Frame (SRF).

The Local Tangent Plane 2D Spatial Reference Frame specifies a local Cartesian coordinate system where the XY plane is tangent to the surface of the Object Reference Model/Earth Reference Model (ORM/ERM) at a parametrically-defined horizontal datum and reference point.

When used to define a 2D coordinate system, the resulting X and Y axes are measured in meters (rather than arc degrees), and a local origin offset is provided. The direction of the Y axis may be rotated from the local polar direction (e.g., geographic North), and the X axis is defined as forming a 2D right-handed coordinate system. The origin (point of tangency) is defined by the parametric geodetic latitude and longitude.

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

Primary Page in DRM Diagram:

• 15

Example

1. A Property Grid maps wind velocities along a coastline. The Property Grid uses a Local Tangent Plane (2D) Spatial Reference Frame with the Y axis parallel to the coast.

FAQs

How does the Local Tangent Plane (LTP2) SRF differ from the Local Space Rectangular (LSR2) SRF?

The Local Tangent Plane (2D) SRF specifies a location in a georeferenced space. The Local Space Rectangular (2D) SRF specifies a location in a Cartesian, non-georeferenced "model" space.

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

x

 in meters

y

 in meters