Best Fit Curve

This command draws an arc between two endpoints with a radius that is derived from sampling points. Least-squares is used to find the radius for the closest arc that passes through these points. After specifying the points, the program calculates the best-fit arc and shows the results in the dialog show here. You can toggle each point for whether to include in the calculations. When a point is toggled off for processing, it is not used to calculate the best-fit arc but the residual is still reported. Use the Remove button to remove a point both from calculation and reporting. You can also modify the radius. After picking OK, the arc is drawn in the current layer and there is a report.

Prompts

Starting Point ?
Pick point or point number: 46
Ending point ?
Pick point or point number: 50
Select points from screen, group or by point number [<Screen>/Group/Number]? press Enter
Select Carlson Software Points.
Select objects: W Use window to select a group of points. After selecting all the points to sample, end selection by pressing Enter.Best Fit Arc
Coordinate File> C:\sample\PLAT.CRD

Source Coordinates
Point#  Northing    Easting     Residual
46      4573.478    5647.688    -0.059   
47      4618.180    5667.428    0.177    
49      4669.960    5671.494    -0.211   
50      4707.039    5664.138    0.093    
Residuals Standard Deviation: 0.148
Average Residual: 0.135

Circle Center: 4657.233,5516.647
Radius: 155.580

Pulldown Menu Location: Draw > Arc 
Keyboard Command: bfitcrv
Prerequisite: Points for sampling should be drawn before execution.