BRAE 239 Lecture Notes - Lecture 4: North American Vertical Datum Of 1988, Sea Level Datum Of 1929, Refraction
15 Oct 2016
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Lab report due next tuesday: ex result next time. Also: what was field book or typed in word doc a. Leveling: the determination of difference in elevation between points. Horizontal line: perpendicular to gravity at one point. Level line: perpendicular to gravity at every point along the line. Curvature and refraction refers to 2 systematic errors associated with leveling. Curvature is the error caused by the fact that the earth is not flat, but is a ellipsoidal surface. Refraction is the error caused by looking through the atmosphere. Differential leveling: determining the difference in elevation by direct measure. Trigonometric leveling: determining elevations by measuring the slope distance and vertic angles between points. If you put your level in the middle of your readings, they will cancel. Need to account for cur y: explain what went wrong in the labs, how you can improve your was the aim of the lab, how did you do the process of the lab.
