What is plane table traversing?

Traversing is the connection of series of straight lines. In the case of traversing, the plane table is located at one point for supposing A as shown below. From that point sight towards B and measure the distance AB. Then shift the plane table to point B and sight towards A and measure BA.

What are the methods of plane table surveying?

There are mainly four methods of plane table surveying, radiation, intersection or triangulation, traversing, and resection.

What is the aim of plane table survey?

Plane table surveying is the graphical method of surveying that is carried out to prepare maps, plans and also to collect details(like topographic details) through field observations. This surveying is carried out utilizing a plane table hence it is named as plane table surveying.

What is the main principle for plane table surveying?

Plane table surveying is based on the principle that lines drawn during plotting always lie parallel to the corresponding lines actually present on the ground. For example, let us consider four ground stations A, B, C and D which on joining provides a rectangle ABCD.

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. 1. Centering

When do you use a traverse plane table?

Since the compass errors tend to compensate, however, the method is useful for surveying long narrow strips, and proves rapid when the plane table is set up at alternate stations only. A traverse plane table (a table with a trough compass recessed in (to the board) is sometimes used for such work.

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.

How to do orientation in plane table surveying?

Orientation in plane table surveying can be done precisely by sighting the points already plotted on the sheet. Two cases may arise When it is possible to set the plane table on the point already plotted on the sheet by way of observation from the previous section. When it is not possible to set the plane table on the point.