Defining Terms Flashcards
(14 cards)
A definite point on an object, the elevation and location of which are known. It may be Permanent (PBM) or Temporary (TBM)
Benchmark (BM)
An intervening point between two benchmarks which point foresight and back sight rod readings are taken.
Turning point (TP)
A rod reading taken on a point of known elevation, as benchmark or turning point. Plus Sight.
Back Sight (BS)
A rod reading taken on a point of unknown elevation or on a point where elevation is to be determined. Minus sight.
Foresight (FS)
The horizontal distance measured from the instrument station to the point where the back sight reading is taken
Back sight distance (BSD)
The horizontal distance measured from the instrument station to the point where the foresight reading is taken
Foresight distance (FSD)
The point location where the instrument is set up.
Instrument Station (IS)
The elevation of the line of sight of the telescope above a datum when the instrument is leveled.
Height of Instrument (HI)
A curved line which graphically portrays the intersection of the vertical plane with the surface of the earth
Profile
Numerical designation given in terms of a horizontal distance any point along a profile line away from the starting point
Stationing
Taken along the center line of the proposed project to provide an accurate representation of the ground surface.
Intermediate Fore sight (IFS)
Points which are established along the profile level route at uniformly measured distance.
Full Stations
Any other intermediate point established along a profile level route which is not designated as full station.
Plus Stations
A process of drawing the vertical scale for a profile much larger than the horizontal scale in order to accentuate the differences in elevation.
Vertical Exaggeration
