Updated May 13, 2021
This article applies to:
- Terrain Forestry
- RoadEng Forestry
The following terminology is used in Survey / Map:
FS Foreshot is a shot on the traverse centerline from current instrument position to the next instrument position.
BS Backshot is a shot on the traverse centerline from current instrument position to previous instrument position. Matching FS and BS shots are averaged.
IFS Intermediate field shot is a shot on the centerline which is not a turning point. The bearing of the IFS shot is assumed to be the same as the next FS which follows.
Figure 1: Centerline shots (FS, BS and IFS)
RS Radial shot is a fore shot off the traverse at any orientation.
Figure 2: Radial shots (RS)
SSL (SSR) Side Slope Left (Right) are shots assumed to be on a perpendicular bisector cross section to the main centerline.
There are two different types of Side Slope shots and can be used in conjunction with one another. They are:
SSL-FS (SSR-FS) is a foreshot on the perpendicular bisector cross section. This point is considered a turning point
SSL-IFS(SSR-IFS) is an intermediate field shot on the perpendicular bisector cross section. This point is not a turning point.
Figure 3: Cross Section Shots (SSL-FS, SSR-FS, SSL-IFS, SSR-IFS)