Detailed plotting in plane table surveying is generally done by radiation.

Explanation:

Introduction to Plane Table Surveying:
Plane table surveying is a method of surveying in which a graphical representation of the area to be surveyed is made in the field. A plane table is used as a basic instrument in this method. The table is set up on the ground and the surveyor observes the objects in the field, takes measurements, and sketches them directly on the paper mounted on the table.

Detailed Plotting:
Detailed plotting involves the process of accurately representing the surveyed data on the plane table. It includes plotting the measured distances, angles, and other relevant details on the paper. This step is crucial in order to create an accurate map or plan of the area being surveyed.

Methods of Detailed Plotting:
There are several methods used for detailed plotting in plane table surveying, including:

1. Traversing: Traversing is a method of surveying in which a series of connected survey lines are used to determine the positions of points on the ground. This method involves measuring the distances and angles between consecutive points and plotting them on the plane table. Traversing is useful for large-scale surveys and for creating accurate maps.

2. Resection: Resection is a method of surveying in which the position of an unknown point is determined by observing it from two or more known points on the ground. The angles and distances between the known points and the unknown point are measured and plotted on the plane table. Resection is useful for locating inaccessible points or for verifying the accuracy of other survey methods.

3. Radiation: Radiation is a method of surveying in which the positions of multiple points are determined by measuring the angles between them and a reference point. The reference point is usually located at one end of the survey line, and the other points are plotted based on their angular measurements from the reference point. Radiation is useful for creating accurate maps and plans.

Conclusion:
In plane table surveying, detailed plotting is generally done by radiation. This method allows for accurate representation of measured angles and distances on the plane table. Other methods such as traversing and resection may also be used depending on the specific requirements of the survey.