Provides access to properties of a vertical coordinate system.

#### Product Availability

#### Description

A vertical coordinate system has two types. It can either be gravity-related, which requires a VerticalDatum; or ellipsoid/spheroid-based which requires a horizontal Datum. A horizontal Datum is the same as one used for a geographic coordinate system. It has a linear unit of measure. A VCS has two parameters. The positiveDirection value defines whether the vertical coordinate system has positive values 'up', for heights, or 'down', for depths. Use -1 for positive depths. The verticalShift parameter is a way to identify this VCS as offset from some other known surface. For example, you might know that a dataset's depths are referenced to mean lower low water (a tidal level). You might also know that for this dataset, mean lower low water is 1.23 meters 'down' from local mean sea level. The VCS could be defined for mean sea level but with a verticalShift of -1.23 to shift the 'zero' level to mean lower low water.

You can use **ISpatialReferenceFactory3** to create a predefined VCS or use the **IVerticalCoordinateSystemEdit** interface to create a custom VCS.

#### Members

Description |
||
---|---|---|

Abbreviation | The abbreviated name of this spatial reference component. | |

Alias | The alias of this spatial reference component. | |

CoordinateUnit | The linear unit of a vertical coordinate system. | |

Datum | The datum of a vertical coordinate system. | |

FactoryCode | The factory code (WKID) of the spatial reference. | |

GetParameters | Gets the vertical coordinate system parameters. | |

Name | The name of this spatial reference component. | |

PositiveDirection | The positive direction of the z coordinates. Up is 1. Down (in the direction of gravity) is -1. | |

Remarks | The comment string of this spatial reference component. | |

Usage | The usage notes of a vertical coordinate system. | |

VerticalShift | The vertical shift of a vertical coordinate system. |

#### Inherited Interfaces

Interfaces | Description |
---|---|

ISpatialReferenceInfo | Provides access to members that control the properties common to all components of a spatial reference system. |

#### CoClasses that implement IVerticalCoordinateSystem

CoClasses and Classes | Description |
---|---|

VerticalCoordinateSystem | Creates a vertical coordinate system. |