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Direct Leveling Home > News > Survey Industry News

   Direct leveling is the most commonly used method of leveling. In this method, measurements are observed directly from leveling instrument.
   Based on the observation points and instrument positions direct leveling is divided into different types as follows:
A. Simple leveling
B. Differential leveling
C. Fly leveling
D. Profile leveling
E. Precise leveling
F. Reciprocal leveling


Simple Leveling
   It is a simple and basic form of leveling in which the leveling instrument is placed between the points which elevation is to be find. Leveling rods are placed at the points and sighted them through leveling instrument. It is performed only when the points are nearer to each other without any obstacles.


Differential Leveling
   Differential leveling is performed when the distance between two points is more. In this process, number of inter stations located and instrument is shifted to each station and observed the elevation of inter station points. Finally difference between original two points is determined.
Fly leveling
Fly leveling is conducted when the benchmark is very far from the work station. In such case, a temporary bench mark is located at the work station which is located based on the original benchmark. Even it is not highly precise it is used for determing approximate level.

Profile Leveling
   Profile leveling is generally adopted to find elevation of points along a line such as for road, rails or rivers etc. In this case, readings of intermediate stations are taken and reduced level for each station is found. From this cross section of the alignment is drawn.

Precise Leveling
   Precise leveling is similar to differential leveling but in this case higher precise is wanted. To achieve high precise, serious observation procedure is performed. The accuracy of 1mm per 1km is achieved.


Reciprocal Leveling
   When it is not possible to locate the leveling instrument in between the inter visible points, reciprocal leveling is performed. This case appears in case of ponds or rivers etc. in case of reciprocal leveling, instrument is set nearer to 1st staion and sighted towards 2nd station.