Leica GPS1200 Series Technical Reference Manual page 784

COGO
Description of fields
Field Option
<Distance
Type:>
Grid
Ground
Ellipsoid
GPS1200
Description
The type of distances and offsets to be accepted as
input or shown as output, and used in the calculation.
Distances are calculated as the trigonometric
distance between the position of two points. The
distance field is <HDist-Grid:>.
Distances are horizontal distances between two
points at the mean elevation parallel to the ellipsoid of
the active coordinate system. The distance field is
<HDist-Grnd:>.
Distances are reduced to the ellipsoid. They are
calculated as the shortest distance between the two
points on the ellipsoid. A scale factor is applied. The
distance field is <HDist-Ell:>.
In the attached coordinate system, a projec-
tion, an ellipsoid and a transformation have to
be defined to calculate grid, ground and ellip-
soid coordinates.
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