Classification Based on Instrument Used
- Chain survey.
- Compass survey.
- Theodolite survey.
- Plane Table survey.
- Tachometric survey.
- Aerial Photographic Survey.
- Remote sensing.
- Surveying with a chain/tape
- Used for determining distance – a linear measurement
- Suitable for surveys of small extent on open ground.
- Purposes – to define boundaries of a piece of land or to take some details.
- Denotes measuring distance either with the help of a chain or tape
- Direct measurements.
- When area is flat, distances are measured in straight lines.
- When area is undulating or has obstacles, the line has to go in a zig-zag fashion.
- Direction of the lines is necessary when required for plotting in paper.
- Compass used to define direction.
- Compass gives bearing of a line.
- The bearing are required for plotting the line on paper.
- Every map has to be provided with a North.
Plane Table surveying
- In normal surveying, field observations are taken first and then plotting done in office.
- Plane table surveying involves simultaneous plotting along with taking field observations.
- No field book required
- Mistakes of booking field notes avoided
- Can compare work on the field itself
- The other types of surveys give only the horizontal dimension
- The vertical coordinates is defined by a level.
- Denoted as reduced level or elevation
- Used for defining alignment of roads, for setting of drainage lines etc.
- Instruments such as chain, compass, level give one form of dimension.
- Theodolite is used for both horizontal and vertical measurement, in the form of angles.
- Works on the principle of optics.
- Used for defining angles unlike compass that gives only bearings.
- Highly used equipment.