There are various methods for measuring linear distances. Methods to be used are distinguished by the degree of precision required.

Various methods for measuring distances are:

Various methods for measuring distances are:

This method is confines to the rough surveys and explorations where a surveyor is called to make rough survey as quickly as possible. It can also be used to roughly check the distances measured by other means. In this method to find the distance between two points surveyor walks between two points and count the number of paces/ steps.Distance between two points is given by product of number of paces & length of one pace. The length of the pace varies with the individual and also the nature of the ground. The length of one’s natural pace may be determined by walking on fairly level ground over various lines of known lengths. Accuracy of pacing is 1 in 100. Pacing is difficult on rough or slope surfaces.**Pacing:**

Passometer is a watch like instrument and is carried in pocket or attached to one leg. The mechanism of instrument is operated by motion of the body and automatically counts the number of paces. Distance is calculated by multiplying number of paces & length of one pace.**Passometer:**

Pedometer is a device similar to Passometer. But pedometer counts the total distance when adjusted to the length of one pace.**Pedometer:**

Odometer is a device which registers the number of revolutions of a wheel. Odometer is fitted to a wheel which is rolled along the length to be measured. Distance between two points is given by product of number of revolution & circumference of wheel. Odometer is note so accurate while using on an undulated ground.**Odometer:**

Chaining is the term which is used when distance are measured with the help of chain or a tape. It is the most accurate method for calculating linear distance. For ordinary precision chains are used and for high accuracy and precision tapes are used.__Chaining:__

TYPES OF CHAINS.

TYPES OF TAPES.