Times are changing... and changing too fast ... often shocking changes come up.. Advent of total station for surveying has made the age old surveying instruments look primitive. You can record three co-ordinates of any point (may be four co-ordinates too, time included) on the ground and even get the levels plotted for calculating quantity of earth and other. Dumpy level levelling works is very cumbersome, requiring many times more man hours and effort. It is better to use total station even for levelling works of larger nature.
Total Station used in government works
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Total
Station instruments are capable of automatic recording of
readings, unlike in the dumpy level / theodolite surveying.
Yet, in departmental works the coordinates and elevations are
to be recorded in level field books... This is to prevent
corruption.
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Government earth works require the departmental engineers to follow certain procedures. The initial level of the land is to be taken using a dumpy level and recorded in the level field books. Level field books contains columns to record, back site, intermediate site, foresight, height of collimation and instrument locations. Levels of bench marks and change points need to be recorded in the field book. After recording initial levels and recording check levels, it should be reported to vigilance and chief technical examiner. Vigilance or the CTE could visit the sites and check the levels. After the site levelling works are completed the final levels are to be taken and recorded in level field books. This also is to be reported to the CTE.
This system is to ensure that corruption does not take place.
Now that if we use total station instrument, instead of dumpy levels, what the recordings in the level field book is different. However the Chief Technical Examiner has clarified that the coordinates and elevations are still to be recorded in the field book as usual.
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