Plane table surveying is a graphical method used for mapping small areas, allowing simultaneous fieldwork and plotting. It involves various accessories like a drawing board, alidade, and tripod, offering advantages such as rapid mapping and cost-effectiveness, though it is less accurate and unsuitable for wet climates. The process includes centering, leveling, and orienting the table, with methods including radiation, intersection, traversing, and resection.

2. Plane Table Surveying
 Plane table is a graphical method of surveying in which the field works and the plotting is
done simultaneously.
 It is particularly adopting in small mapping.
 Plane table surveying is used for locating the field computation of area of field.

4. Accessories Used In Plane Table Survey
 Drawing board mounted on tripod: Board is made up of well seasoned wood such
as teak of size 40 x 30 cm to 75 x 60 cm.
 Alidade: Alidade consists of two vertical sight vane fitted at end the end of
straightedge. The straight edge ruler usually made of brass or teak wood
graduated beloved edge.
 Tripod: To Support drawing board tripod is used.
 Sprit Level : For levelling the table spirit level is used.
 Plumbing Fork: For Centering the table plumbing fork is used.
 Drawing Sheet: Good Quality paper is used.

5. Advantages
 It is most suitable for preparing small scale map or surveying small area.
 It is most rapid method.
 Field book is not necessary.
 No great skill is required for satisfactorymap.
 It is particularly suitable for magnetic area where prismatic
compass is not reliable.
 Contour and irregular object may be represented accurately.
 It is less costly.

6. Disadvantages
 Plane Table essentially in a tropicalinstruments.
 It is not suitable to work in wetclimate.
 There are several accessories to be carried out and therefore they are likely to
belost.
 It is not suitable for accurate work.

7. Principle of plane table survey
 Fix the table on the tripod and level it. Transfer the survey station on the
drawing paper as “O”.
 Now, place the alidade on the paper such that zero mark of alidade coincide
with point “O” on the paper. This process is calledpivoting.

8.  Pivoting the alidade about “O”. Rotate it to sight “A” on the ground. Draw
ray oa.
 Measure distance OA on the ground and plot it along the ray to get a.
 Normally, points O, A, B, C… etc. represents the points on the ground while
the points o, a, b, c… etc. represents the points on the drawingpaper.

9. Setting Up The PlaneTable
 Methods of setting planetable:
 Centering: It is the process of keeping the table over the station that the point on
the paper representing the station being occupied is vertically over the point on
the ground. It is done by forked plumbbob.
 Levelling: The levelling is done by means of levelling screws and socket
arrangement with reference to level tube placed in two position at right angles to
eachother.
 Orientation: Orientation is the process of keeping the table to the position which
is occupied at the firststation.

10. Method Of Plane Tabling
 There are four distinct methods of planetabling:
Method of Radiation Method of Intersection
Method of Traversing Method of Resection

11. ThankYou
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