1 Definition
A Data Type representing an Object’s position, velocity, and acceleration.
2 Functional Requirements
- The Position of an Object is that of a representative point in the Object.
- Cartesian and Polar Coordinate Systems are supported.
- The following media used types are supported: Audio; Visual; Audio-Visual; Haptic; Smell; RADAR; LiDAR; Ultrasound.
- Error is the estimated absolute value of the measured spatial and angular values of each of CartPosition, SpherPosition, CartVelocity, SpherVelocity, CartAccel, SpherAccel.
3 Syntax
https://schemas.mpai.community/OSD/V1.1/data/Position.json
4 Semantics
Table 1 provides the semantics of Position. It should be noted that each of Position, Velocity, and Acceleration can be expressed either in Cartesian (X,Y,Z) or Spherical (r,φ,θ) Coordinates.
Table 1 – Semantics of the Spatial Attitude
| Header | N1 Bytes | Position Header |
| – Standard-Position | 9 Bytes | The characters “OSD-OPS-V” |
| – Version | N2 Bytes | Major version – 1 or 2 characters |
| – Dot-separator | 1 Byte | The character “.” |
| – Subversion | N3 Bytes | Minor version – 1 or 2 characters |
| ObjectPositionID | N4 Bytes | Identifier of Object Position. |
| General | N5 Bytes | Set of general data |
| – CoordinateType | N6 Bytes | One of Cartesian, Spherical, Geodesic, Toroidal. |
| – ObjectType | N7 Bytes | One of Digital Human, Generic. |
| – MediaType | N8 Bytes | One of Speech, Audio, Visual, Audio-Visual, Haptic, Smell, RADAR, LiDAR, Ultrasound. |
| – Precision | N9 Bytes | one of single precision, double precision |
| Position | ||
| – CartPosition (X,Y,Z) | 12/24 Bytes | Array (in metres) |
| – SpherPosition (r,φ,θ) | 12/24 Bytes | Array (in metres and degrees) |
| Velocity of Position | ||
| – CartVelocity (X,Y,Z) | 12/24 Bytes | Array (in metres) |
| – SpherVelocity (r,φ,θ) | 12/24 Bytes | Array (in metres and degrees) |
| Acceleration of Position | ||
| – CartAccel (X,Y,Z) | 12/24 Bytes | Array (in metres) |
| – SpherAccel (r,φ,θ) | 12/24 Bytes | Array (in metres and degrees) |
| Errors | ||
| – ErrCartPosition | N11 Bytes | Error of CartPosition |
| – ErrSpherPosition | N12 Bytes | Error of SpherPosition |
| – ErrCartVelocity | N13 Bytes | Error of CartVelocity |
| – ErrSpherVelocity | N14 Bytes | Error of SpherVelocity |
| – ErrCartAccel | N15 Bytes | Error of CartAccel |
| – ErrSpherAccel | N16 Bytes | Error of SpherAccel |
| DescrMetadata | N17 Bytes | Descriptive Metadata |
