This command allows for the calculation and storing of points based upon standard surveying practices of Bearing-Bearing, Bearing-Distance, or Distance-Distance Intersection calculations. Data can be entered manually or defined by selecting points from a point list or map. The kind of intersection calculation to be performed determines the number of possible solutions. With a Bearing-Bearing calculation, there will be only one possible solution. Bearing-Distance, and Distance-Distance calculations will have two possible solutions prompting the user to pick the desired solution. Note that in intersection calculations of Bearing-Distance and Distance-Distance there may be no solution for the input data. In these cases, Carlson SurvCE will display the message, "No Valid Solution."
From the COGO Menu, select Intersections. Fill out the appropriate data fields to perform the desired calculation. The Enter key moves forward through the edit boxes. The current Angle setting in Job Settings, Units, dictates whether angles are prompted as azimuth or bearings.
All Intersect routines create SP records in the raw file, storing the calculated coordinates for each new point. This SP record is identical to records created by keyboard input.
Bearing-Bearing
This method locates a point at the intersection of two lines. Select Point 1 by entering the desired point number, or pressing the Point List icon and selecting the desired point. Pressing the Map icon will allow for selection of the desired point directly from the screen. Note that when selecting a point from the screen, if the desired point cannot be determined from the picked point on the screen, a listing of the nearest points to the desired location will appear allowing for verification of the targeted point. If the list appears, select the desired point from the list by clicking on it.
Define the bearing from the first point by typing in the bearing or by specifying two point Ids. Repeat the procedures for defining the bearing from the second point.
Bearings can be entered in three forms:
Once data entry is complete, press the OK button. The calculated point will appear on the screen with the input data detailed at the bottom of the screen. Store, Modify (review and revise) and RESULTS Options are located on the right side of the Map screen.
The results screen will display the coordinates of the base points, the inverse bearing, the distance from the base points to the calculated INT1 point (and INT2 for distance intersections), and the coordinate data for the calculated points. Note that calculated points are labeled as Int1 and Int2 until the points are stored. These Option Buttons are present on all Map screens displayed while in the Intersections routine. Once Store is selected or the Enter key pressed the stored point will inherit the specified point number, description, and the elevation displayed at the bottom of the screen (optional). There can be only one solution for a bearing-bearing intersection.
All Intersect routines handle the 400 circle, if configured to grads/gons within Job Settings, Units.
Bearing-Distance
Define the Bearing from the first point, then define the known horizontal distance from the second point.
Select OK and the map screen will appear showing a circle radiating from the distance base point and a line from the bearing base point, defined by the entered bearing. The line is extended to intersect the circle at the two possible solutions.
Pressing Enter or Store will display the prompt "Pick a Solution". To select the point, simply pick it from the screen. Picking near the desired solution is sufficient. The program will select the nearest solution position. Pressing Enter again will accept the second possible solution for the intersection.
Distance-Distance
Enter the known horizontal distances from both points.
Select OK, and the map screen will display showing circles radiating from the first and second selected base points. Lines leading from both base points to the two possible intersections of the circles are also shown.
Pressing Enter or Store will display the prompt "Pick a Solution". Select the desired calculated solution. To select the point, simply pick it from the screen. Picking near the desired solution is sufficient. The program will select the nearest solution position. Pressing Enter again will accept the second possible solution for the intersection. If there was no solution for the input data, SurvCE will display "No Valid Solution".