To Create a Point Along a Survey Centerline by Chainage, Offset, and Vertical Distance

You can create a point given a vertical distance, with respect to the current centerline, height of instrument, and prism height.

The level is computed by subtracting the prism height from the instrument height, then algebraically adding the vertical distance.

To create a point along a centerline using a vertical distance from the Survey Command Window

1. In Toolspace, on the Survey tab, right-click the network to edit, and click Survey Command Window.
2. Click Centerline menu Chainage/Offset Vertical Distance.
3. Enter the point number of the point you want to create.
   Note: If auto point numbering is on, then the next point is displayed.
4. Enter the station of the new point. The station can be a positive or a negative value.
5. Enter the offset of the new point. The offset can be a positive or a negative value.
6. Enter the vertical distance.
7. Optionally, enter a description for the point.

To create a point along a centerline using a vertical distance, using the survey command language

1. In Toolspace, on the Survey tab, right-click the network to edit, and click Survey Command Window.
2. At the Command line, enter:

   CL VD (point) [station] [offset] [vertical distance]

Command Line Example

BEGIN CL1

NE 1 1000 1000

NE 2 1000 1500

NE 3 1300 1700

END

CL IS CL1

HI 200

PRISM 5

CL VD 10 350 150 7.25

! POINT 10 NORTH: 850.0000 EAST: 1350.0000 LEVEL: 202.2500

Command Syntax

CL VD (point) [station] [offset] [vertical distance]

Parameter	Definition
point	The identifier of the new point that you want to create. You do not need to assign a point number if auto point numbering is on.
station	The station of the new point.
offset	The perpendicular distance from the centerline to the new point.
vertical distance	The level difference from the instrument to the prism. If the prism is higher than the instrument, then this is a positive value.