The process of determining the locations of the instrument station by drawing resectors from the locations of the. known stations is called
The methods used for locating the plane table stations are
The correct answer is
Radiation- All the measurements are taken from a single section
Intersection- Plotting same point from two stations
Traversing -Traversing by the plane table is similar to compass or theodolite traversing. The method, therefore, can be used for laying down the survey lines of a closed or unclosed traverse.It can be used to locate the plane table stations.
Resection: Resection is a method of plane table surveying in which location of plane table is unknown and it is determined by sighting it to known points or plotted points. It is also called method of orientation.
The instrument which is used in plane tabling for obtaining horizontal and vertical distances directly without resorting fo chaining, is known as
Orientation of a plane table by solving two point problem is only adopted when
For locating an inaccessible point with the help of only a Plane table, one should use
(i) Radiation method is suitable only when the area to be surveyed is small and all the stations are visible and accessible from the instrument station.
(ii) Traversing is most suited when a narrow strip of terrain is to be surveyed e.g. survey of roads, railway etc.
(iii) Intersection method is preferred when the distance between stations is large or the stations are inaccessible or the ground is undulating.
(iv) Resection is used when some important details can be plotted easily by choosing any station other than the triangulation station.
Three point problem can be solved by
Consider the following statements pertaining to plane table survey
1. Two point problem is solved by mechanical method
2. Three point problem is solved by Bessel’s method
3. In two point problem, auxiliary station is required
Which of these statements is/are correct?
Match List-I (Statement) with List-Il (Situation) and select the correct answer using the codes given below the lists:
A. Accurate centering in plane table surveying is necessary for
B. Exact orientation is more important than accurate centering for
C. The intersection method of plane table surveying is particularly employed for
D. Plane table survey is useful for
1. Inaccessible points
2. Open country with good intervisibility
3. Large scale maps
4. Small scale maps
5. Hilly regions
The method of orienting a plane table with two inaccessible points is known as
Match List-l (Methods) with List-II (Procedures) and select the correct answer using the codes given below the lists:
1. Rays are drawn to locate the station on which the table is set-up
2. At least two rays are drawn from two different stations to the details to be located
3. Rays are drawn in the direction of details through ine station point on which the table is set-up
4. Rays ace drawn on the map by setting up the table over each of the stations towards the subsequent station