Scales | Engineering Surveying
Scale is a fixed ratio that every distance on the plan bears with corresponding distance on the ground.
Scale can be represented by the following method
One centimetre on the plan represents some whole number of the metres on the ground.
1cm = 10m
This type of scale is called engineering scale.
1 unit of length on the plan represents some number of same units of length on the ground.
This ratio of map distance to the corresponding ground distance independent of units of measurement is called Representative Factor (RF).
1cm = 50m
RF = 1/(50×100) = 1/5000
Above two types of scales are also known as numerical scales.