Class Name: TM Location 2D

Superclass - Location 2D

Definition

A coordinate within the Transverse Mercator (TM) 2D Spatial Reference Frame (SRF).

The Transverse Mercator projection-based Spatial Reference Frame is a cylindrical, conformal projection normally placed tangent to a meridian of the Object Reference Model/Earth Reference Model (ORM/ERM). When secant, two meridians rather than a single meridian are defined; alternatively this can be expressed as a "central scale factor" at the meridian.

Only the ORM/ERM central meridian and equator are straight lines in the Transverse Mercator 2D SRF.

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 X axis parallels the equator, increasing in the easterly direction; the Y axis lies along the central meridian, increasing in a northerly direction, and forms a 2D right-handed coordinate system. The origin is defined by the intersection of the parametric central meridian and a parametric parallel.

The canonical 2D Local Tangent Plane (LTP2) SRF, when embedded in a TM SRF, would have its X and Y axes aligned with the corresponding X and Y axes of the TM SRF.

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

Primary Page in DRM Diagram:

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Example

1. The British National Grid (BNG) uses Transverse Mercator. Note that the Transverse Mercator Spatial Reference Frame is often used to describe areas that have greater north-south than east-west extent, and that distortion of scale, distance, direction and area increase away from the central meridian.

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

x

 in meters; positive eastward

y

 in meters; positive northward