Module org.opengis.geoapi

Package org.opengis.referencing.datum

package org.opengis.referencing.datum

Relationship of a Coordinate System (CS) to the Earth, another celestial body or a platform. For geodetic and vertical coordinate reference systems (CRS), the datum is known as reference frame and shall relate the coordinate system to the Earth or other celestial body. With other types of CRSs, the datum may relate the coordinate system to another physical or virtual object. It may be a moving platform such as a car. The datum itself is not time-dependent, but any transformations of the associated coordinates to an Earth-fixed or other coordinate reference system may contain time-dependent parameters.

Dynamic reference frame

If the subtype of Datum is geodetic or vertical, the frame-defining parameters may include time evolution to describe the motions of points used to define the reference frame. Then the geodetic or vertical reference frame is dynamic.

Since:

1.0

Departure from OGC/ISO standard for closer integration with the Java environment

The Calendar code list is omitted because the handling of calendar systems is delegated to the java.time framework.

Related Packages

Package	Description
org.opengis.referencing	Base interfaces for reference systems by coordinates or by identifiers.
org.opengis.referencing.crs	Reference systems by coordinates.
org.opengis.referencing.cs	Coordinate Systems and their axes.
org.opengis.referencing.operation	Coordinate operations (relationship between any two CRS).

Class	Description
Datum	Specifies the relationship of a coordinate system to an object.
DatumAuthorityFactory	Creates datum objects using authority codes.
DatumEnsemble<D extends Datum>	Collection of datums which for low accuracy requirements may be considered to be insignificantly different from each other.
DatumFactory	Builds up complex datum objects from simpler objects or values.
DynamicReferenceFrame	Reference frame in which some of the defining parameters have time dependency.
Ellipsoid	Geometric figure that can be used to describe the approximate shape of a planet.
EngineeringDatum	Identification of the origin of an engineering (or local) coordinate reference system.
GeodeticDatum	Position, scale and orientation of a geocentric Cartesian 3D coordinate system relative to the planet.
ImageDatum	Deprecated. Replaced by EngineeringDatum as of ISO 19111:2019.
ParametricDatum	Identification of a particular reference surface used as the origin of a parametric coordinate system.
PixelInCell	Deprecated. This code list has been removed from ISO 19111:2019 together with ImageDatum.
PrimeMeridian	Definition of the origin from which longitude values are determined.
RealizationMethod	Specification of the method by which the vertical reference frame is realized.
TemporalDatum	Definition of the relationship of a temporal coordinate system to an object.
VerticalDatum	Identification of a particular reference level surface used as a zero-height surface.
VerticalDatumType	Deprecated. Replaced by RealizationMethod in ISO 19111:2019.