PLANE TABLE SURVEYING INSTRUMENTS EBOOK

PLANE TABLE SURVEYING INSTRUMENTS EBOOK

PLANE TABLE SURVEYING INSTRUMENTS EBOOK!

Plane table surveying also called plane tabling, is a method of surveying in which field work and office work are done simultaneously on a plane table. The field. “Surveying is an art of making measurements on the surface of the earth. Plane Table is a graphical method of surveying in which the field. A plane table (plain table prior to ) is a device used in surveying and related disciplines to The plane table became a popular instrument for surveying.


PLANE TABLE SURVEYING INSTRUMENTS EBOOK

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PLANE TABLE SURVEYING INSTRUMENTS EBOOK


A graduated scale is mounted on the horizontal axis.

One side of the metal ruler is used as the working edge along which lines are drawn. The angles of elevation or depression can be read on the vertical circle.

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 plane table surveying instruments sighted.

The radiation method is suitable for surveys of small areas which are likely to be commanded from a single station. It is useful in large-scale works if used in combination with other methods. If the distances are obtained tacheometrically with the help of telescopic alidade provided with stadia-hairsthe work can be finished very rapidly and thus, in this case; the method will have a wider scope.

Plane table

This method is widely employed for plotting the details on the maps. It can also be used for plotting the position of plane table surveying instruments to be used at subsequent stations. The various points can be located by the intersection of rays drawn from two different stations A and B forming a baseline.

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  • INSTRUMENTS USED IN PLANE TABLE SURVEYING.

The only linear measurement required is that of the baseline AB on the ground. The method may also be employed for locating the distant and inaccessible objects, the rivers, in a survey of the hilly areas where distances cannot be measured easilyplane table surveying instruments for checking the remote objects.

It is used for sighting objects and drawing rays along one of its beveled edges known as ruling or working or fiducial edge is graduated so as to serve as a scale for plotting distances.

EQUIPMENT'S ARE USED IN PLANE TABLE SURVEYING - Passionate Seeker

plane table surveying instruments It is available in two forms a Plain alidade b Telescope alidade. It consists of a wooden or brass ruler 50 to 75 cm long, or of a length equal to the smaller dimension of the broad and is provided with a pair of vertical sight vanes at its ends.

One of the vanes is provided with a narrow slit, while the other is open and carries a horse-hari or fine-wire.

A small circular hubble is sometimes attached to the alidade for leveling the table. Graphical method Tracing Method in Plane Table Surveying In tracing method, plane table is located at a point from where three points are visible.

Plane Table Surveying with Methods and Examples

The plane table surveying instruments is oriented with respect to the plotted lines of those three points. Place the tracing paper on the drawing sheet and again sight the three points and plot the radiating lines.

Hence marking on the edges in this state indicates magnetic north—south direction.

PLANE TABLE SURVEYING INSTRUMENTS EBOOK

Drawing Sheet and Accessories for Drawing A good quality, seasoned drawing sheet should be used for plane table surveying. The drawing sheet may be rolled when not in use, but should never is folded.

Equipments for Plane Table Survey and Their Uses

For important works fibre glass sheets or paper backed with thin aluminium sheets are used. Clips clamps, adhesive tapes may be used for fixing drawing sheet to the plane table.

Use of a plane table[ edit ] In use, a plane table is set over a point and brought to precise horizontal level.



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