This dialog lists the tolerances used by TPC as it computes and displays data.
Two points are considered to be the same if their coordinates are within this distance of each other. This value shows up in many of the COGO dialogs, where the program looks to see if there is any existing point close to a computed point. An example would be when computing a station offset, if there is an alignment point within the tolerance of the computed station point, a new point will not be created. Default Coordinate = 0.01, Default Elevation = 0.1
In a perfect semi-circle, the long chord distance is exactly twice the radius and the central angle is 180°. In any arc, if the radius is less than half the long chord distance, any computations of the arc are invalid. Because of rounding error, the radius of a semi-circle is sometimes slightly shorter than half the long chord distance. To accommodate this rounding error, specify the tolerance used to compare the long chord distance with twice the radius to determine whether or not a semi-circle is a valid arc. Default = 0.01
The closed loop tolerance helps TPC determine if a traverse is a Closed Loop or Closed Point-To-Point traverse. The % Tolerance indicates the maximum error a Closed Loop can have and still be considered a Closed Loop. For example, if the total length of a traverse is 400 feet and it closes back on itself within 4 feet, this would correspond to a 1% Tolerance. Default = 0.10%
Until you specify a traverse to be a Closed, Closed Point-to-Point or Open traverse, TPC must determine whether or not the traverse is a Closed Loop. Once you specify a closure type for a traverse, TPC no longer uses the Closed Loop Tolerance for that traverse.
Only Closed Loop traverses are able to generate an area. Close Loop traverses can also compute an Error of Closure without any additional input from the user.
If the measured legs of a resection differ by more than this amount, the program displays a message and does not compute the resection. Default = 0.1
Applies the Program Settings you have selected.
Discards any changes made in the Program Settings and returns you to the previous view.