Choice of scale
- Selection of scale depends upon the purpose, size and the required precision of plotting.
- Generally classified as :
a) Large Scale: 1 cm= 10 m or than 10 m
b) Medium scale: 1 cm – 10 m to 100 m
c) Small Scale: 1 cm = 100 m or more than 100 m
- For most engineering projects, the scale varies from 1 cm = 2.5 m to 100 m small scale.
- Topographical maps are usually drawn to scale 1 cm = 1 km
- A scale of 1 cm = 5 m to 50 m is generally used for plans prepared for sub-divisions of land.