CONF: Confidence Regions

This record specifies which confidence regions (error ellipses, error ellipsoids, and height confidence intervals) GeoLab should produce when processing a network.

An absolute (or point) confidence region for the adjusted coordinates of a point is a region in which there is a certain statistical confidence (usually 95%) that the actual position of the point falls within that region.
A relative confidence region for the adjusted coordinate differences of two points is a region in which there is a certain statistical confidence (usually 95%) that the actual position difference of the two points falls within that region.

The format of this record is:


Columns 002-005: CONF
Columns 007-009: Compute height confidence intervals (YES/NO)
Columns 011-013: Compute 2D horizontal error ellipses (YES/NO)
Columns 015-017: Compute 3D error ellipsoids (YES/NO)
Columns 019-021: Compute point confidence regions (YES/NO)
Columns 023-025: Compute relative confidence regions (NO/ALL/CON/RAD), see table below
Columns 027-039: Radius for RAD option in previous field
Columns 041-042: Linear unit name

The options for relative confidence regions specify that the following relative confidence regions are to be computed:
NO: None
ALL: Those for all lines in the network (default)
CON: Only those for connected (observed) lines
RAD: Only those for lines shorter than the specified radius (last field)