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Obstacle to chaining and ranging - Obstacle to ranging but not chaining
Chain surveying
Obstacle to chaining and ranging
Obstacle to chaining and ranging
Obstacle to ranging but not chaining
In this type of obstacle, the ends are not intervisible and are quite common, except in a flat country.
AB is the line in which A and B are not visible from intermediate point on it. Through A, draw a random line AB1 in any convenient direction but as nearly towards B as possible. The point B1 should be chosen in such a way that B1 is visible from B and BB1 is perpendicular to the random line. Measure BB1. Select C1 and D1 on the random line and erect perpendicular C1C and D1D on it. Join CD and prolong.
In this type of obstacle, the ends are not intervisible and are quite common, except in a flat country.
AB is the line in which A and B are not visible from intermediate point on it. Through A, draw a random line AB1 in any convenient direction but as nearly towards B as possible. The point B1 should be chosen in such a way that B1 is visible from B and BB1 is perpendicular to the random line. Measure BB1. Select C1 and D1 on the random line and erect perpendicular C1C and D1D on it. Join CD and prolong.
Last modified: Friday, 29 April 2011, 6:45 AM