| Package | Description | 
|---|---|
| org.geotools.referencing.crs | Coordinate reference systems implementation. | 
| org.opengis.referencing.crs | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | DefaultGeocentricCRSA 3D coordinate reference system with the origin at the approximate centre of mass of the earth. | 
| class  | DefaultGeographicCRSA coordinate reference system based on an ellipsoidal approximation of the geoid; this provides
 an accurate representation of the geometry of geographic features for a large portion of the
 earth's surface. | 
| Modifier and Type | Interface and Description | 
|---|---|
| interface  | GeocentricCRSA 3D coordinate reference system with the origin at the approximate centre of mass of the earth. | 
| interface  | GeographicCRSA coordinate reference system based on an ellipsoidal approximation of the geoid; this provides
 an accurate representation of the geometry of geographic features for a large portion of the
 earth's surface. | 
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