09/10/18

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Topographic Survey

Gathers data on the location of natural and man-made features, contours, and ground elevation to create a topographic map

Property Survey(Boundary Survey)

Establishes property lines for a lot

used to create a plat

LEGAL DESCRIPTION

Metes and Bounds

They designate the boundaries of land parcels by describing lengths and directions of lines from a point of beginning (POB) or monument

lines are described with respect to natural or artificial monuments

Site Survey

Combination of a property survey and topographic survey

May be required to receive a construction permit

Construction Survey

Locates points and elevations that can be used to establish correct locations and elevations for engineering and architectural projects

Optical equipment

requires a visual line-of-sight

A theodolite measures vertical and horizontal angels

A total station is an electronic/ optical surveying instrument

optical equipment (Cont.)

Auto Level

Commonly used on building sires

internal compensator can automatically level the instrument

measures difference in elevation between the line of sight and a point

GPS Tech

A global navigation satellite system

developed by the US Department of Defense

A constellation of satellites that broadcast radio signals

Receivers intercept several satellite signals in order to determine precise location

Stadia Readings

Estimae distance between rod and equipment

Rod intercept is the difference between stadia readings

DISTANCE= ROD UPPER STADIA- LOWER STADIA X 100

Differential Leveling

Start with point of known elevation

Sight to rod on BM(benchmark)= Backsight (BS)

Height of Instrument (HI) HI=BM elev.+ BS

without moving tripod

sight to rod on point of unknown elevation= Foresight(FS)

Identify the elevation of point

Elev= HI-FS

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