Attribute: Horizontal accuracy
Attribute type: F
The best estimate of the horizontal accuracy of horizontal clearance and distances.
Minimum value: 0
Unit: defined in the HUNI subfield of the DSPM record or in the HUNITS attribute of the M_UNIT meta object class, e.g. metre (m)
Resolution: 0.1 m or 0.1 ft
0.5 for an error of 0.5 metre.
The expected input is the radius of the two-dimensional error.
The error is assumed to be positive and negative. The plus/minus character shall not be encoded.