Class Name: OM Location 2D

Superclass - Location 2D

Definition

A coordinate within the Oblique Mercator (OM) 2D Spatial Reference Frame (SRF).

The Oblique Mercator projection-based Spatial Reference Frame is a cylindrical, conformal projection placed tangent to the Object Reference Model/Earth Reference Model (ORM/ERM) along lines which are neither meridians nor parallels. When secant, two rather than a single "central line" are defined; alternatively this can be expressed as a "central scale factor". The "central line" is defined by two locations on the ORM/ERM.

When used to define a 2D spatial reference frame, the resulting X and Y axes are measured in meters (rather than arc degrees), and a local origin offset is provided. The X axis lies along the central line, increasing from the first to second parametric location; the Y axis is perpendicular to the central line and forms a 2D right-handed coordinate system. The origin is defined by the first parametric location.

(Note that the central line is never along a parallel or meridian, in which cases the projection-based SRF thus defined would be either a Mercator (M) or Transverse Mercator (TM), respectively.)

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

Primary Page in DRM Diagram:

• 15

Example

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