THE 5-SECOND TRICK FOR CONTOUR SURVEY IN DHAKA

It varies from 20 m to 100 m. Nearer intervals are expected if ground amount differs abruptly. The cross- sectional line needn't be constantly be at proper angles to the key line. This technique is ideally fitted to road and railway initiatives. Radial Line ApproachNaturally, to find out differences in elevation concerning two points, the contour i