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In regard to the resection method of plane table survey, the term тАШresectorтАЩ refers to the _____________.
rays drawn from the known location of the station to the known location of the points
rays drawn from the known location of the station to the un-plotted location of the points
rays drawn from the un-plotted location of the station to the un-plotted location of the points
rays drawn from the un-plotted location of the station to the known location of the points
rays drawn from the un-plotted location of the station to the known location of the points
In plane table surveying, resection is the process of locating the position of an instrument station on the map, given that the station is not yet plotted. A 'resector' is the ray drawn from this un-plotted instrument station through a known ground point whose location is already marked on the drawing sheet.
In plane table surveying, resection is the process of locating the position of an instrument station on the map, given that the station is not yet plotted. A 'resector' is the ray drawn from this un-plotted instrument station through a known ground point whose location is already marked on the drawing sheet.
Resection┬аPoint=тЛВi=1nтАЛRiтАЛ
Where┬аRiтАЛ┬аis┬аthe┬аray┬аdrawn┬аfrom┬аunknown┬аpoint┬аP┬аthrough┬аknown┬аpoint┬аPiтАЛ
The principle relies on geometric intersection. By centering the table at an unknown point and sighting known control points (represented by dots on the sheet), rays are drawn toward these points. The intersection of these rays (or the point determined by the resection method) defines the exact position of the instrument station on the map.
Resection is used to determine the station position, unlike intersection which is used to locate an object.
Common methods include Three-Point Problem and Two-Point Problem.
A minimum of two or three rays (resectors) are required to fix a position depending on the method used.
The accuracy of the point depends on the angle of intersection of the resectors; an angle close to 90┬░ is ideal.
Allows establishment of new stations without prior traversing.
Efficient for filling in details in areas not reachable by other methods.
Subject to geometric errors if the intersection angle is too sharp.
Requires at least two or three previously identified control points on the ground.
Locating instrument stations in hilly terrain.
Establishing control points for filling map details.
Options A, B, and C describe incorrect scenarios: A implies the station is already known, B and C involve incorrect logic regarding known versus unknown coordinates.
The term 'Resection' comes from the Latin 'resectio', implying cutting back to find a position relative to fixed references.
D is correct тАФ Resectors are defined as rays drawn from the un-plotted location of the station to the known location of the points.
Always remember: 'Intersection' is used to find unknown object points from known stations, while 'Resection' is used to find unknown station points from known object points.
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