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Plane table surveying is a graphical method of surveying in which both the fieldwork and plotting are done simultaneously using a plane table. The main advantage of plane table surveying is that the topographic features to be mapped are in full view.
In this article we discuss the major Advantages & disadvantages of plane table survey.
Advantages of Plane Table Survey
The advantages of use of plane table in surveying are-
- It is the most used and suitable method for surveying and preparing small scale maps.
- All possible human and machine errors can be eliminated as the surveying and plotting are done simultaneously in the field.
- Plane table surveying finds its importance in the places with high magnetic fluctuations where compass survey is not reliable.
- As this type of survey does not use the machine, it is less costly than most of the type of surveying techniques.
- It is one of the most rapid surveying techniques.
- Errors occurring due to mistakes in the field book entry are eliminated.
- Contours and other irregular objects may be accurately represented on the map since the tract is in view.
- It does not require skilled personal to plot the map.
- The errors and mistakes in plotting can be checked by drawing check lines.
Disadvantages of Plane Table Survey
The disadvantages of use of plane table in surveying are-
- The process of shifting and re-orienting the plane table from one place to another is very lengthy.
- This type of surveying is not feasible in raining and windy areas as the plotting work are done in the field itself.
- The plane table and its accessories are heavy and difficult to carry
- The accuracy achieved in other types of surveying is higher than the accuracy achieved by plane table surveying.
- If the survey is to be re?plotted to a different scale or quantities are to be computed, it is a great inconvenience in the absence of the field notes.
- It is not suitable for surveying large areas.
- This method of surveying is not suitable in dense forest areas as the trees block the view of other important components of the field.
- This method of surveying can only be done in the day time.