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FAQs on Plane Table Surveying - Surveying, GATE - Civil Engineering (CE)

1. What is plane table surveying?
Ans. Plane table surveying is a method of surveying where a plane table, which is a flat, level table, is used to measure angles and distances on a field. It involves placing the plane table at one of the survey points and then sighting the other points using a surveying instrument called an alidade. This method is commonly used for small-scale surveys and mapping.
2. What are the advantages of plane table surveying?
Ans. Plane table surveying offers several advantages. Firstly, it is a relatively simple and straightforward method that does not require complex instruments or calculations. Secondly, it provides accurate and reliable measurements, especially for small areas or irregular terrains. Additionally, it allows for immediate visualization and mapping of the surveyed area directly on the table, which aids in data analysis and decision-making.
3. How does plane table surveying differ from other surveying methods?
Ans. Plane table surveying differs from other surveying methods in terms of the instruments used and the technique employed. Unlike traditional surveying methods that rely on theodolites or total stations, plane table surveying uses a plane table and an alidade. This method also involves direct plotting of measurements on the table itself, eliminating the need for additional calculations or data processing.
4. What are the limitations of plane table surveying?
Ans. Plane table surveying has a few limitations. Firstly, it is not suitable for large-scale surveys or areas with significant variations in elevation. Secondly, it requires a clear line of sight between survey points, making it challenging to conduct surveys in densely populated or obstructed areas. Lastly, the accuracy of measurements can be affected by external factors such as weather conditions or human errors in setting up the table.
5. Is plane table surveying still relevant in modern surveying practices?
Ans. While plane table surveying may not be as commonly used as advanced surveying techniques such as GPS or LiDAR, it still holds relevance in certain applications. It is often employed for small-scale surveys, preliminary mapping, or in situations where immediate visualization of data is required. Additionally, some surveyors may prefer using plane table surveying for its simplicity and cost-effectiveness in specific scenarios.
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