Compare radiation and intersection methods of plane table surveying on any two parameters.
Radiation method
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Intersection method
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1. It requires the plane table to occupy a single station.
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1. This method requires setting the table up at minimum of two stations.
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2. Orientation table is not required.
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2. Orientation is essential and can be done by back sighting.
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3. To conduct the survey of an area, the table is kept at a convenient station A commanding a full view of the area to be surveyed.
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3. Two station A and B are selected so that they command a full view of the area to be surveyed.
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4. In this method, rays are drawn from the station to the objects, and the distance from the station to the object are measured and plotted to any suitable scale along respective rays.
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4. In this method distance of base lene only is measured. Distance of object from station is not measured
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5 This method is suitable when points to be plotted are within accessible from single station.
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5 This method is suitable for locating inaccessible points by the intersection of the rays drawn from two instruments stations.
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