State four advantages and four disadvantages of plane table survey

State four advantages and four disadvantages of plane table survey
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2 Answers

Answer :

Advantages :-

1. It is the most rapid method of surveying.

2. There is no need for a field book as plotting is done along with the field work. So, the problem of mistake in booking field notes does not arise.

3. Plotted work can be compared with actual object regardless of whether or not they are properly represented.

4. There is no possibility of overlooking any important object.

5. There is no possibility of overlooking any measurement as plotting is done in the field.

6. Irregular objects may be represented accurately.

7. It is suitable in magnetic areas.

8. The map can be prepared easily, and does not require any great skill. 

9. Errors in measurement and plotting can be detected by check lines.

10. Inaccessible points can be easily located by intersection.

Disadvantages :-

1. The plane table is not suitable for accurate work as the fitting arrangement is not perfect.

2. Plane table surveying is not suitable in wet climate, in the rainy season, on foggy mornings and in windy weather.

3. The number of accessories required in such survey is large, and they are likely to be lost.

4. The instrument is very heavy and difficult to carry.

5. The map cannot be re-plotted to a different scale as there is no field book.
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Answer :

Advantages:
1. A field book is not required.
2. Errors of booking in field book avoided.
3. Errors of plotting can be readily checked.
4. Suitable in magnetic area.
5. Survey work with rapid speed.
6. Simple method and not special skills are required.
7. Plotted field and actual field can be compared on the site.
8. No office work of plotting.
9. Distance of inaccessible object can be determined.
Disadvantages:
1. Required many accessories and chances of loosing.
2. Equipment is heavy and cumbersome to carry.
3. Not suitable when accuracy is required.
4. Survey cannot be done in rainy season.
5. Difficult to re-plot as field notes are not available.

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Related questions

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Defines the terms : i) Survey Station ii) Survey Line iii)Offset iv)Triangulation

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Enlist the factors affecting on selection of survey station or survey line in chain survey.

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State any two uses of Plane Surveying.

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Explain errors occurred due to manipulation and sighting in plane tabling.

Description : Explain errors occurred due to manipulation and sighting in plane tabling.

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Define orientation and principle of plane tabling.

Description : Define orientation and principle of plane tabling. 

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Explain with neat sketch the procedure of radiation method of plane tabling.

Description : Explain with neat sketch the procedure of radiation method of plane tabling.

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What are the sources of errors in plane tabling?

Description : What are the sources of errors in plane tabling?

Last Answer : The following are the sources of errors in plane tabling 1) The board not being horizontal 2) The table not being accurately centered 3) The table not being Correctly oriented 4) The objects ... through the station point 7) Inaccuracy in plotting 8) The expansion and contraction of the paper 

Differentiate between plane of collimation and rise and fall method.

Description : Differentiate between plane of collimation and rise and fall method.

Last Answer : S.N Rise and fall method Plane of collimation 1 It is slow and more tedious. It is more rapid and less tedious  2 It is laborious as it involves more calculations. It is simple ... .S.-ΣF.S=ΣRise-Σfall =Last RL-First RL Arithmetical check ΣB.S.- ΣF.S=Last RL-First RL