| Name | Description | Type | Package | Framework |
| AbstractCRS | Abstract coordinate reference system, usually defined by a coordinate system and a datum. | Class | org.geotools.referencing.crs | GeoTools |
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| AbstractDerivedCRS | A coordinate reference system that is defined by its coordinate conversion from another coordinate reference system | Class | org.geotools.referencing.crs | GeoTools |
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| AbstractSingleCRS | Abstract coordinate reference system, consisting of a single coordinate system and a single | Class | org.geotools.referencing.crs | GeoTools |
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| CRS | Simple utility class for making use of the coordinate reference system and associated Factory implementations. | Class | org.geotools.referencing | GeoTools |
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| CRS .AxisOrder | Ordering in which longitude comes before latitude, commonly referred to as x/y ordering. | Class | org.geotools.referencing.CRS | GeoTools |
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| DefaultCompoundCRS | A coordinate reference system describing the position of points through two or more independent coordinate reference systems. | Class | org.geotools.referencing.crs | GeoTools |
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| DefaultDerivedCRS | A coordinate reference system that is defined by its coordinate conversion from another coordinate reference system but is not a projected coordinate reference system. | Class | org.geotools.referencing.crs | GeoTools |
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| DefaultEngineeringCRS | A contextually local coordinate reference system. | Class | org.geotools.referencing.crs | GeoTools |
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| DefaultGeocentricCRS | A 3D coordinate reference system with the origin at the approximate centre of mass of the earth. | Class | org.geotools.referencing.crs | GeoTools |
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| DefaultGeographicCRS | A 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 | Class | org.geotools.referencing.crs | GeoTools |
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| DefaultImageCRS | An engineering coordinate reference system applied to locations in images. | Class | org.geotools.referencing.crs | GeoTools |
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| DefaultProjectedCRS | A 2D coordinate reference system used to approximate the shape of the earth on a planar surface. | Class | org.geotools.referencing.crs | GeoTools |
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| DefaultTemporalCRS | A 1D coordinate reference system used for the recording of time. | Class | org.geotools.referencing.crs | GeoTools |
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| DefaultVerticalCRS | A 1D coordinate reference system used for recording heights or depths. | Class | org.geotools.referencing.crs | GeoTools |
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| EPSGCRSAuthorityFactory | Default implementation for a coordinate reference system authority factory backed by the EPSG property file. | Class | org.geotools.referencing.crs | GeoTools |