### 9 Mapping of DataTypes

### 9.3 OPC UA Structure DataTypes

## 9.3.4 LocalCoordinate

This DataType is a structure that defines the location of an object in a Cartesian local coordinate system arbitrarily chosen during configuration of an RTLS system. Its composition is formally defined in Table 41.

**Table 41** **– LocalCoordinate Structure**

Name |
Type |
Description |
---|---|---|

LocalCoordinate | Structure | |

X | Double | The X – coordinate of the object’s position in the unit defined by the LengthUnit property of the AutoID Device. |

Y | Double | The Y – coordinate of the object’s position in the unit defined by the LengthUnit property of the AutoID Device. |

Z | Double | The Z – coordinate of the object’s position in the unit defined by the LengthUnit property of the AutoID Device. |

Timestamp | UtcTime | Timestamp in UtcTime |

DilutionOfPrecision | Double | DOP is a value for the variance of the measurements delivered by the location system. The calculation of the value depends on the underlying system and is vendor specific. Values should be in accordance with the implementations like in GNSS systems. |

UsefulPrecision | Int32 | Values for Easting, Northing, and Altitude should be rounded by the clien tapplication to the n-th position after the decimal point. It specifies the number of useful digits after the decimal place. |

Its representation in the AddressSpace is defined in Table 42.

**Table 42** **– LocalCoordinate Definition**

Attributes |
Value |
---|---|

BrowseName | LocalCoordinate |

IsAbstract | False |

Subtype of Structure defined in OPC 10000-5. |