Give one reason for each of the following: (i) Ranging pole has a pointed metal end. (ii) Note book is important during field study. (iii) Back bearings are taken during compass survey. (iv) During surveying, measurements are called back by the booker
(i) Ranging pole has a pointed metal end: The pointed metal end of a ranging pole is used to precisely mark a specific point on the ground. This helps in accurately establishing control points or reference points during surveying. The pointed end allows for precise placement and ensures that the pole is firmly planted in the ground, reducing errors in measurements.
(ii) Note book is important during field study: A notebook is essential during field study as it serves as a record-keeping tool. Researchers and surveyors can document their observations, measurements, sketches, and other relevant information in the notebook. It helps in maintaining a systematic record of data and ensures that important details are not forgotten or lost. The notebook also serves as a reference for future analysis, interpretation, and reporting of the field study findings.
(iii) Back bearings are taken during compass survey: Back bearings are taken during compass survey to verify the accuracy of the initial bearings and to check for any errors or discrepancies in measurements. By taking back bearings, the surveyor can compare the observed bearings with the calculated or expected bearings. If there is a significant difference between the two, it indicates the presence of angular errors or magnetic disturbances that may affect the accuracy of the survey.
(iv) During surveying, measurements are called back by the booker: Calling back measurements by the booker is an important practice in surveying to ensure accuracy and prevent errors. It involves the surveyor or booker repeating the recorded measurements aloud, allowing for cross-checking and verification. This process helps in identifying any mistakes, transposition errors, or misreadings that may have occurred during the initial measurement. It acts as a quality control measure and enhances the reliability and validity of the survey data.
A chain survey is a simple land survey that deals with measuring and recording a series of linear distances on the ground by using a chain or a tape measure.
The chain survey is the simplest method of surveying. In this survey, only measurements are taken in the field, and the rest work, such as plotting calculation, etc. are done in the office.
This is most suitable adapted to small plane areas with very few details. If carefully done, it gives quite accurate results.
The necessary requirements for field work are chain, tape, ranging rod, arrows, and sometimes cross-staff.
The following are disadvantages of simple chain survey:
A simple chain survey can not be conducted in built-up areas and large areas.
A simple chain survey is subject to several chances of errors of accumulation which may be caused by the problem of the chain. The chain linkage may fail to stretch up properly and result in inaccurate data. Also clogging of the chain may read to an error in reading.
It is time-consuming
It may not be conducted in areas with steep slopes or waterlogged areas. chain survey is usually conducted in dry areas with gentle slopes. It becomes more complicated when a survey is conducted in areas that are too wet.
Chain survey becomes a more complicated method when there are raised points (obstacles) in between areas to be surveyed.