Class Name: SM Location 3D

Superclass - Location 3D

Definition

A coordinate within the Solar Magnetic (SM) 3D Spatial Reference Frame (SRF).

The Solar Magnetic Spatial Reference Frame also known as Solar Geomagnetic (SG), is based on a Cartesian coordinate system with 3 orthogonal axes and an origin at the Object Reference Model/Earth Reference Model (ORM/ERM) mass-center as defined by the World Geodetic System (WGS) 1984 ellipsoid). The Z axis is defined as coincident with the geomagnetic (magnetic dipole) axis and is positive towards the north. The Y axis is defined as perpendicular to the Earth-Sun line (positive towards dusk) and lies in the Geomagnetic Equatorial plane. The X axis is defined as orthogonal to the other axes and lying in the Geomagnetic Equatorial plane, (although it does not necessarily point to the Sun), so as to form a right-handed orthogonal set.

Locations are defined as {lon, lat, r} triplets from the origin (ORM/ERM mass-center). Longitude (lon) is defined as the geocentric angle in the Geomagnetic Equatorial plane from the Geomagnetic meridian containing the Earth-Sun line to the Geomagnetic meridian containing the radius vector (and positive towards the East). Latitude (lat) is defined as the geocentric angle between the radius vector and the Geomagnetic Equatorial plane; it is positive towards the north. R is the magnitude of the radius vector.

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

Primary Page in DRM Diagram:

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Example

SM provides a convenient system for ordering data controlled more strongly by the Earth's dipole field than by solar wind. It has been used for representing magnetopause cross-sections and magnetospheric magnetic fields.

FAQs

Is SM inertial?

SM is quasi-inertial in that it rotates with both a yearly and daily period.

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

longitude

 in degrees

latitude

 in degrees

radius

 in meters