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Basic Exam 3

QuestionAnswer
Vertical Line Line that follows the local direction of gravity as indicated by a plumb line
Level Surface Curved surface at every point perpendicular to local plumb line Level surface is curved – because the reference datum is curved
Level Line Line in a level surface; therefore, a curved line
Horizontal Plane Plane perpendicular to the local direction of gravity
Horizontal Line Line in Horizontal Plane
Vertical Datum Any level surface to which elevations are referenced
Geoid A particular level surface that serves as a datum for all elevations and astronomical observations
Elevation Distance measured along a vertical line from a vertical datum to a point or object
Mean Sea Level (MSL) Average height for the surface of the seas for all stages of tide over a 19-year period as defined by NGVD29
Tidal Datum Vertical datum used in coastal areas for establishing property boundaries of lands bordering waters subject to tides
Benchmark Relatively permanent object natural or artificial, having a marked point whose elevation above or below a reference datum is known or assumed
Back Sight Positive
Foresight Negative
Hight of instrument Elevation at your set up point
Unknown Elevation What your looking for also know as UK or Elev
Barometric Leveling Barometric pressure is inversely proportional to elevation
Leveling Methods Measuring vertical distances, Barometric, Trigonometry, Differential
Combined Correction Page Check
Refraction Correction 0.0206
NAVD88 North American Vertical Datum 1988
Permissible Misclosure 0.02
Reciprocal Leveling Used when leveling across topographic features such as rivers, lakes, canyons
Three-Wire Leveling Taking a reading from all and average them
Created by: jstillion0404
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