The best method of plotting contour lines for relatively small areas, such as building sites, is known as the grid method. The surveyor divides the plot of land into a checkerboard and takes elevations at the grid intersections and records these in the field book.

Where is grid contouring used?

Squares or grid method is suitable for contouring of plains or gently sloping grounds. The steps adopted are as follows: i) Mark square grids on the land to be surveyed. The grid size would depend on the extent of survey.

What is contouring in Levelling?

contouring is an angle measuring operation while levelling is for measuring heights. contouring focuses on finding points having a given elevation while levelling is to find the elevation of given points.