Adding New Definitions – Global Mapper

You can extend GeoCalc to support an unlimited number of custom objects. The parameters for each base definition are stored within an XML database file referred to as the Geodetic Datasource, a file named geodata.xml. All user-defined parameters will be stored in a file named custom.xml

Creating New Objects

To create new objects, open the DataSource menu by creating a DataSourceEditor object and calling the the Show method to display it. Then, select the type of object that you wish to add from the side menu. Right click in the list of objects, and pick New Object to open the creation dialogs...

For more information on adding custom objects, modifying objects, or deleting objects from the datasource refer to the object types listed below.

See Also:

Linear Unit Definitions

Angular Unit Definitions

Ellipsoid Definitions

Datum Definitions

Coordinate Transformation Definitions

Coordinate System Definitions

Area of Use Definitions

Point Style Definitions

Prime Meridian Definitions

Because the format in which numbers are stored in GeoCalc, only sixteen significant digits are guaranteed in coordinate system parameter values. If the input value has more than sixteen significant digits, it will be approximated as nearly as possible. This may mean that some decimal numbers could show up in the definition dialogs with slight differences in the least significant digits. For more information on how floating-point numbers are represented please refer to the IEEE Standard for Binary Floating-Point Arithmetic (IEEE 754).