Class Name: UTM Location 3D

Superclass - Location 3D

Definition

A coordinate within the Augmented Universal Transverse Mercator (AUTM) 3D Spatial Reference Frame (SRF).

The Augmented Universal 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 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 Augmented Universal Transverse Mercator 3D SRF.

When used to define a 3D 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 Z axis is oriented perpendicular to the other two axes, and forms a 3D right-handed coordinate system. The origin is defined by the intersection of the parametric central meridian, a parametric parallel, and the parametric vertical datum.

The AUTM SRF extends the ATM SRF by specifying the meridian of the positive Y axis, the parallel of the origin, and the central scale factor.

• The central meridian is defined in terms of a "zone" ranging from 1 through 60, where the central meridian of Zone 1 is 177 degrees west, and successive Zones occur in 6 degree increments.
• The parallel of the origin is fixed at the equator.
• The central scale factor is 0.9996, thus "lowering" the plane of the projection to intersect the ORM/ERM at two meridians of secancy (roughly 180,000 meters east and west of the central meridian) where the scale is 1.0. The scale increases to about 1.0010 near the zone boundaries at the equator.

In addition, the AUTM SRF divides the range of the Y axis into two halves according to the hemispheres. The Y axis origin is located at the equator, however in the northern hemisphere the value of Y at the origin is 0 and in the southern hemisphere the value of Y at the origin is 10,000,000. Furthermore, the origin is defined as having an X coordinate of 500,000 meters in both hemispheres. This allows all coordinates within a zone to have positive values of both X and Y.

AUTM SRF coordinates may thus be related to ATM SRF coordinates under the equivalent parametric conditions by the following formulas:

• X(AUTM) = X(ATM) + 500,000
• Y(AUTM) = Y(ATM: Northern Hemisphere) or
  = Y(ATM: Southern Hemisphere) + 10,000,000
• Z(AUTM) = Z(ATM)

The AUTM SRF is only defined between the 84 degree north and 80 degree south parallels.

The canonical 3D Local Tangent Plane (LTP) SRF, when embedded in an AUTM SRF, would have its X, Y, and Z axes aligned with the corresponding X, Y, and Z axes of the AUTM SRF.

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
• 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

x

 in meters; positive Eastward

y

 in meters; positive Northward

z

 Elevation or height;
 positive along xy surface normal