The methods used for locating the plane table stations are1. radiation...
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.
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The methods used for locating the plane table stations are1. radiation...
Methods used for locating plane table stations:
1. Radiation
- In this method, the position of the station is determined by sighting a single object from the station and then measuring the distance and direction to that object.
- This method is most suitable for locating stations when the object is visible from the station and the distance is not too great.
2. Traversing
- In this method, the position of the station is determined by a series of measurements from one station to another in a closed loop.
- This method is most suitable for locating stations when the terrain is irregular or when obstacles prevent the use of radiation method.
3. Intersection
- In this method, the position of the station is determined by sighting two or more objects from the station and then measuring the angles between the lines of sight.
- This method is most suitable for locating stations when the objects are visible from the station and the distance between them is not too great.
4. Resection
- In this method, the position of the station is determined by sighting two or more objects from known positions and then measuring the angles between the lines of sight.
- This method is most suitable for locating stations when the objects are visible from known positions and the distance between them is not too great.
Therefore, the correct answer is option 'C' which states that the methods used for locating plane table stations are 2 and 4, i.e., traversing and resection.