16 Control Surveys

# 16 Control Surveys - Control Surveys CE 111 Definitions...

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Control Surveys CE 111

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Definitions: Line – a mathematical line (invisible) without breadth Corner – the end of a boundary line or the change in direction of a boundary line May also be placed to reference a point
Definitions: Boundary invisible line that identifies and separates adjoining tracts of land Monuments the physical object that indicates the location of a point, station, or corner (bench marks, control points)

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Plane vs. Geodetic Surveys Plane surveys measurements reflect a horizontal surface (less than 300 sq. miles) Used for surveys of small geographic areas. Geodetic Surveys – measurements reflect the curved (ellipsoidal) shape of the earth Used for surveys of large geographic areas. Used for higher accuracy
Accurate surveying cannot be done without good monuments (control points) Networks for geodetic horizontal and vertical control points are continually being extended and upgraded

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Typical Geodetic Monuments: (bench marks/control points)
Not just for surveying…

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Monuments = Control Points = Bench Marks 250,000+ horizontal control points ~ U. S.
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## This note was uploaded on 09/20/2011 for the course C E 111 taught by Professor Staff during the Spring '08 term at Iowa State.

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16 Control Surveys - Control Surveys CE 111 Definitions...

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