Crandall Polyline Adjustment

This command applies a crandall adjustment to a perimeter defined by a polyline. The command draws a new polyline of the adjusted perimeter and creates a report. The closure error is the difference between the end point of the polyline and the specified closing point that the program prompts for. For a closed loop adjustment, the closing point is the starting point of the polyline.

Here is an example report for a closed loop.

Crandall Polyline Adjustment

Closure Results
Starting Point   : N 5212.097 E 4476.155
Ending Point     : N 5209.953 E 4491.172
New Point        : N 5212.097 E 4476.155
Azimuth Of Error : N 81°52'24" W
North Error      : -2.144
East Error       : 15.017
Distance Error   : 15.169
Distance Traverse: 4093.830
Closure Precision: 1 in 269.9

Original Data
Angle          Distance 
S 01°56'05" E  826.057  
S 84°59'27" E  1154.279 
N 02°17'10" E  914.234  
N 89°29'16" W  1199.260 

Adjusted Point Comparison
Original                Adjusted
Northing    Easting     Northing    Easting     Dist   Angle
5212.097    4476.155    5212.097    4476.155    0.000  N 90°00'00" E
4387.393    4504.014    4387.393    4504.014    0.883  N 01°56'05" W
4287.253    5646.513    4287.253    5646.513    7.558  N 78°20'03" W
5201.307    5683.005    5201.307    5683.005    7.666  N 74°17'17" W
5212.097    4476.155    5212.097    4476.155    15.169 N 81°52'24" W

Adjusted Data
Angle          Distance 
S 01°56'05" E  825.175  
S 84°59'27" E  1146.879 
N 02°17'10" E  914.782  
N 89°29'16" W  1206.897 
 

Prompts

Pick polyline for Crandall Adjustment: pick polyline
Reverse polyline [Yes/<No>]? press Enter
Close polyline to start point or pick new closing point [<Close>/Pick]?  press Enter

Pulldown Menu Location: Survey > Polyline Tools
Keyboard Command: crandalladj
Prerequisite: A polyline