Geodetic Double Proportion Line Division

This command is used to restore a lost corner from new measurements between four known corners with two measurements each on intersecting meridianal and latitudinal lines. The program prompts for the four known corner points to establish the retracement. Plus the program prompts for the four sets of record bearings and distances from the known points to the lost corner. The report then shows the calculated point along with the input data.

Double Proportion

Retrace Point    Northing      Easting      

1st North-South  243758.936    471259.132   

2nd North-South  252622.467    471144.220   

1st East-West    248221.216    477033.581   

2nd East-West    248208.591    464242.295

Record           Bearing       Distance     

1st North-South  N 00°05'03" W 4529.100     

2nd North-South  N 01°09'48" W 4335.400     

1st East-West    N 89°34'32" W 5821.300     

2nd East-West    S 89°03'47" W 6971.200     



                 Northing      Easting      

New Point        248287.938    471213.134

Prompts

Pick First point for North-South line: pick a point
Pick Second point for North-South line: pick a point
Mean Bearing from Record (Qdd.mmss): 40.5027
Enter Record Distance [<Meters>/Feet/Chains]: 4529.1
Mean Bearing from Record (Qdd.mmss): 41.0948
Enter Record Distance [<Meters>/Feet/Chains]: 4335.4
Pick First point for East-West line: pick a point
Pick Second point for East-West line: pick a point
Mean Bearing from Record (Qdd.mmss): 489.3432
Enter Record Distance [<Meters>/Feet/Chains]: 5821.3
Mean Bearing from Record (Qdd.mmss): 389.0347
Enter Record Distance [<Meters>/Feet/Chains]: 6971.2

Pulldown Menu Location: COGO > Geodetic
Prerequisite: Grid projection under Drawing Setup
Keyboard Command: geodprop