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4.1 Define the following leveling terms

a) Vertical control; A series of benchmarks or other point of known elevation established

throughout an area. Vertical control is usually carried out by direct leveling.

b) Elevation; The distance along a vertical line from a vertical datum to a point or object.

The elevation of a geographic location is its height above or below a fixed reference point, most

commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential

gravitational surface

c) Vertical datum; Any level surface to which elevations are referenced A vertical datum is a base

measurement point (or set of points) from which all elevations are determined. Without a

common datum, surveyors would calculate different elevation values for the same location.

4.2 How far will a horizontal line depart from the earths in 1km? 5km and 10kms

(apply both curvature and refractions)

1km? Cm = 0.0675(1)

2

= 0.068 m

5km = Cm = 0.0675(5)

2

= 1.68 8m

10kms = Cm = 0.0675(10)

2

= 6.750 m

4.2 Visit the website of the national geodetic survey at http://www.ngs.noaa.gov and obtain a

data sheet description of benchmark of your local area

AE8289 STATE/COUNTY- MN/ST LOUIS

AE8289 COUNTRY - US

AE8289 USGS QUAD - DULUTH (2017)

AE8289

AE8289 *CURRENT SURVEY CONTROL

AE8289

______________________________________________________________________

AE8289* NAD 83(2011) POSITION- 46 46 29.10992(N) 092 05 37.38770(W)

ADJUSTED

AE8289* NAD 83(2011) ELLIP HT- 156.085 (meters) (06/27/12)

ADJUSTED

AE8289* NAD 83(2011) EPOCH - 2010.00

AE8289* NAVD 88 ORTHO HEIGHT - 184.348 (meters) 604.82 (feet)

ADJUSTED

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4.1 Define the following leveling terms a) Vertical control; A series of benchmarks or other point of known elevation established throughout an area. Vertical control is usually carried out by direct leveling. b) Elevation; The distance along a vertical line from a vertical datum to a point or object. The elevation of a geographic location is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational surface c) Vertical datum; Any level surface to which elevations are referenced A vertical ...
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