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Coordinate Systems 7

Description: GNSS measured points are always stored based on the global geocentric
datum known as WGS 1984. Most surveys require coordinates in a local grid system. For example, based on a country’s official mapping datum or an arbitrary grid system used in a particular area such as a construction site. To convert the WGS 1984 coordinates into local coordinates a coordinate system must be created. Part of the coordinate system is the transformation used to convert coordinates from the WGS 1984 datum to the local datum.

A coordinate system
• allows the conversion from WGS 1984 geodetic or cartesian coordinates
to local grid coordinates and back.
• can be directly received from a reference network.
• can be uploaded from a USB Memory device.
• can be exported to a USB Memory device. 

☞ Refer to 6.6 Import, Export, or Delete Data for information about importing, exporting, or deleting coordinate systems.

Default coordinate systems: The default coordinate system is WGS 1984. It cannot be deleted. It is not possible to create a coordinate system called WGS 1984. Additional default coordinate systems may be available for certain countries.

Active coordinate system: The active coordinate system is the one selected under Settings > System Configuration > Coordinate systems. One coordinate system is always considered as the active coordinate system.

Automatic coordinate system (RTCM transformation parameters): When Via Network is selected under Settings > System Configuration > Coordinate systems, the coordinate system is directly received from the reference network via RTCM correction data.

☞ Reference networks do not always provide a coordinate system. This will depend on how the network provider has chosen to configure their data streams.

Coordinate system components: The iCON gps 60 SmartAntenna supports the same coordinate system formats as other Leica iCON products including iCON 3D, iCON Office, iCONstruct field software, as well as Leica RedLine and GNSS Leica Viva sensors.

Coordinate systems can be made up of up to three linked files:
• .lok: Localisation file, contains all the needed parameters and settings, for example datum, map projection and local transformation.
• .ccg: Correction grid (Country Specific Coordinate System model). Refer to CSCS model (*.ccg) for information about CSCS.
• .grd: Geoid model. Refer to Geoid model for further information.
• .csc: Correction grid (Country Specific Coordinate System model).
• .gem: Geoid model.