To Create an Observation Using a Face1 or Face2 Angle

Create an observation from a traverse station using a horizontal angle measured on Face1 or Face2 of your instrument.

You can then input the measurements, using the Face1 (direct) and Face2 commands. These commands apply collimation (if set), and automatically average the sightings after you input observations.

Face1/Face2 angles can be collected in any order. If Face1 or Face2 observations are recorded, then a corresponding Face1 or Face2 backsight should also be recorded. In the case where Face1 or Face2 foresight observations are recorded without a Face1 or Face2 backsight, the setup's orientation is used in the foresight calculation.

AutoCAD Civil 3D uses all reciprocal observations to a point (both foresight and backsight) by calculating an average horizontal and vertical distance of all the observations as long as the distance is a non-zero value to calculate the average horizontal and vertical position of a point. The correct average for all Face1/Face2 and reciprocal observations is applied when a network or traverse adjustment is performed. An adjustment may be done to get the correct average values whether there is a closed traverse or not.

Note: For parameter descriptions, see the Quick Reference tab.

To create an observation using a Face1 or Face2 angle, using the command language

1. In Toolspace, on the Survey tab, right-click the network that you want to add points to, and click Survey Command Window.
2. At the Command line, enter:

   F1(point) [angle] [distance] (description)

   or

   F2 (point) [angle] [distance] (description

To create an observation using a Face1 or Face2 angle and vertical angle, using the command language

1. In Toolspace, on the Survey tab, right-click the network that you want to add points to, and click Survey Command Window.
2. At the Command line, enter:

   F1 VA (point) [angle] [distance] [vertical angle] (description)

   or

   F2 VA (point) [angle] [distance] [vertical angle] (description)

To create an observation using a Face1 or Face2 angle and vertical distance, using the command language

1. In Toolspace, on the Survey tab, right-click the network that you want to add points to, and click Survey Command Window.
2. At the Command line, enter:

   F1VD (point) [angle] [distance] [vertical distance] (description)

   or

   F2 VD (point) [angle] [distance] [vertical distance] (description)

Example: Face1

NE 2 200 200

AZ 2 1 100

STN 2 1.585

BS 1

F1 VA 101 0 30.480 100 BS

! AZIMUTH: 101.6126 DISTANCE: 30.4800

! POINT 101 NORTH: 199.2280 EAST: 230.4702

! ELEV: <Null>

F1 VA 102 89.5370 15.304 101.2052 IP

! AZIMUTH: 191.1682 DISTANCE: 15.3013

! POINT 102 NORTH: 184.8457 EAST: 202.1159

! ELEV: <Null>

Points created Face1 command:

Point 101 is located by turning a horizontal angle of 0 right from Face1, and a vertical angle of 100 at a distance of 30.480 from the instrument point with the description BS.

Point 102 is located by turning a horizontal angle of 89.5370 right from Face1, and a vertical angle of 101.2052 at a distance of 15.304 from the instrument point with the description IP. Angles and distances are in the current units, unless you type a qualifying suffix.

Example: Face2

NE 2 200 200

AZ 2 1 100

STN 2 1.585

F2 1 200

F2 VA 101 311.4954 15.30 301.0355 IP

! AZIMUTH: 213.1080 DISTANCE: 15.300

! POINT 101 NORTH: 198.2901 EAST: 199.6429

! ELEV: <Null>

Points created Face2 command:

Point 101 is located a distance of 15.30 from the instrument setup at an observed angle right from the backsight of 311.4954. The actual physical angle turned is 111.49, with a vertical angle of 301.03. The description for the point is IP. Angles and distances are in the current units, unless you type a qualifying suffix.

Note: This is an angle turned with the scope inverted. Normally, the backsight is set at a 180° angle, so that the difference between it and the angle is the amount of the angle turned right (100°20'45").