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Block levelling in surveying is a method of identifying elevation changes between two points. It involves the use of an optical level, which is used to establish an elevation baseline across a series of points. From this baseline, the level is then used to correct for any changes in the elevation over a given distance.
This technique is particularly useful when doing topographic surveys or other precision measurements that are affected by minute changes in elevation.
Block levelling is the indirect method of levelling of contours. This method is used for a small survey area. The area to be surveyed is divided into a number of squares or blocks and the size of each block varies from 5 m to 20 m depending upon the nature of the contour or contour interval. The Reduced Level (RL) of corners of a square block is determined by means of a level and a staff.