What are the method of plane table survey?
Methods of Plane Table Surveying
- Radiation.
- Intersection.
- Traversing.
- Resection.
What is a plane table surveying?
Plane table surveying is a graphical method of survey in which the field observations and plotting are done simultaneously. It is simple and cheaper than Theodolite survey but it is mostly suitable for small scale survey.
What is the use of plane table in surveying?
A plane table (plain table prior to 1830) is a device used in surveying site mapping, exploration mapping, coastal navigation mapping, and related disciplines to provide a solid and level surface on which to make field drawings, charts and maps.
Which of the following methods of plane table surveying is used to locate the position of inaccessible points?
Resection
Resection is the method of locating the station occupied by the plane table when the position of that station had not been previously plotted from other station.
Which instrument is used in plane table survey?
Alidade
Detailed Solution. Alidade: It is an instrument used in plane table survey. It is a wooden or brass ruler of about 50-60 cm in length. It is also known as sight rule.
What is resection method in surveying?
In surveying, free stationing (also known as resection) is a method of determining a location of one unknown point in relation to known points. The instrument can be freely positioned so that all survey points are at a suitable sight from the instrument.
What is plane table survey explain the main instrument of plane table survey?
In a plane table surveying a table top, similar to drawing board fitted onto a tripod is the main instrument. A drawing sheet is fixed on to the table top, the observations are made to the objects, distances are scaled down and the objects are plotted in the field itself.
What are the instrument used in plane table surveying?
3) A compass is for marking the north direction on the paper . 4) A plumbing fork with a plumb bob for centering the table. 5) Tripod : A tripod is a three-legged stand for a drawing board , used to stabilize the drawing board. 6) Other items: Paper, Pins, Pencil , Rubber , Scale etc.
What are types of plane table?
There are mainly four methods of plane table surveying, radiation, intersection or triangulation, traversing, and resection.
Which among the following methods of plane table is most commonly used?
2. Which of the following methods is a widely used method of plane tabling? Explanation: Among the following, traversing is adopted in the usual manner. It involves a very simple procedure and also gives more accurate values when compared to other processes.
Which method of plane table surveying is most suitable for locating the instrument station?
Radiation Method : The distances are cut to a suitable scale after actual measurements. This method is suitable only when the area to be surveyed is small and all the stations are visible and accessible from the instrument station. The scope of the method is increased when the distances are measured by a tacheometer.
Which instrument is not used for plane table survey?
Explanation: Spirit level is used for levelling the table at the station point. Plumb bob is used to transfer the point in sheet to the ground. Compass is used to indicate the magnetic north. Theodolite is not used in this case as the entire process is done manually without any instrumental usage.
How is plane table surveying used in civil engineering?
The plane table surveying is one of the fastest and easiest methods of surveying. Plotting of plans and field observations can be done at the same time in plane table surveying. It is useful for the following cases: It is often used to fill in details between stations fixed by triangulation method or theodolite traversing method.
What are the disadvantages of plane tabling surveying?
(1) Plane tabling is not suitable for work in wet climates, in places where high winds predominate, and in wooded country. (2) If the area to be surveyed is large, frequent changes in the size of drawing sheets are required. (3) Due to changes in temperature, the table is liable to warp.
How is the intersection of rays used in plane table surveying?
The intersection of rays from stations O1 and O2 will give points a, b etc. on paper, as shown in the figure. This is more or less like the compass survey. It is used for running survey lines between stations, which have been previously fixed by other methods of survey, to locate the topographic details.
Which is the radiation method of plane tabling?
(1) Radiation method of plane tabling: In this method of plain table survey, the plane table is set up at only one station, and various points are located by radiating (drawing) a ray from the instrument station to each of the points, and plotting to scale along the ray the distance measured from the station to the point is sighted.