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Grid vs Ground: In a Traverse





This topic discusses how to use Grid and Ground in a Traverse View.

Distance Factor

The Traverse View allows you to use a distance factor to relate grid distances to the distances it displays. The distance factor is displayed on the status bar when you highlight a distance and is printed out with the traverse data.  TPC uses the following formula in the Traverse View. You assign a combined scale factor (grid factor X elevation factor) to a CRS. In the Traverse View, you can tell TPC to use this combined scale factor as the distance factor. Each traverse has it's own distance factor that is stored with the traverse, so it is very easy to create one traverse on the grid for computing area and another traverse at your project elevation to check measured ground distances. You'll find lots of uses for the distance factor.

When recalling points in the Traverse View and displaying inversed data,

distance displayed in the Traverse View = inversed grid distance / distance factor (for that traverse)

When entering measured distances in the Traverse View and reducing field data (measured distances) to grid coordinates,

grid distance used to compute a point on the rectangular coordinate system = measured ground distance X distance factor

Specifying a distance factor for a traverse takes care of relating the distances displayed in the Traverse View to the grid. If you want to work strictly on the grid, leave the distance factor set to 1.000000 (the default). Remember, all rectangular coordinates in TPC are grid coordinates. So the distance factor always starts or ends with grid coordinates.

Distance Type

Any distance type you select for a traverse automatically manages the conversion between grid and ground.

Related Topics

Choosing a Coordinate Reference System
Converting Between Grid and Geodetic Positions
Importing and Exporting Geodetic Positions
CRS Files


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