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Shot Types

Updated October 17, 2017


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)

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