BASICS SURVEYING MEASUREMENT AND UNITS
Basic and Derived units of length. Area and volume in the SI
system
| QUANTITY | NAME OF THE SI UNITS | SYMBOL |
| 1. LENGTH | Metre | m |
| Kilometre | km | |
| Centimetre | cm | |
| Millimetre | mm | |
| 2. AREA | square metre | m² or Square.m |
| Square Kilometre | km² or Square.km | |
| Square Centimetre | cm² or Square.cm | |
| Square Millimetre | mm² or Square.mm | |
| 3. VOLUME | Cubic metre | m³ or Cubic.m |
| Cubic Centimetre | cm³ or Cubic.c | |
| Cubic millimetre | mm³ |
Basic units For length in MKS & FPS system
| METRIC UNITS | BRITISH UNITS (FPS) |
| 10 millimetres
= 1 centimetre |
12 inches
= 1 foot |
| 10 centimetres= 1 decimetre | 3 feet
= 1 yard |
| 10 decimetres=1metre | 5/½ yards
= 1 rod, pole or perch |
| 10 metres =1decametre | 4 poles
= 1 chain (66 feet) |
| 10 decametres =1hectometre | 10 chains
= 1 furlong |
| 10 hectometres= 1 kilometre | 8 furlongs
= 1 mile |
| 1852 metres= 1 nauticalmile | 100 links
= 1 chain = 66 feet |
| 6080 feet
= 1 nautical mile |
|
| 6 feet
= 1 fathom |
|
| 120 fathoms = 1 calbe length |
Conversion Factors (Metres, Yard, Feet and Inches)
| METRES | YARDS | FEETS | INCHES |
| 1 | 1.0936 | 3.2808 | 39.37 |
| 0.9144 | 1 | 3 | 36 |
| 0.3048 | 0.3333 | 1 | 12 |
| 0.0254 | 0.0278 | 0.0833 | 1 |
Conversion Factors (Kilometres, Mile and Nautical Miles)
| KILOMETRES | METRE | NAUTICAL MILES |
| 1 | 0.6214 | 0.5399 |
| 1.6093 | 1 | 0.869 |
| 1.852 | 1.1508 | 1 |
Basic units of Area (in MKS & FPS)
| METRIC UNITS (MKS) | BRITISH UNITS ( FPS) |
| 100 sq. millimetres = 1 sq. centimetre |
144 sq . Inches = 1 Sq.Foot |
| 100 Sq. centimetres = 1 Sq. decimetre | 9 sq. Feet = 1sq.yard |
| 100 sq. decimetres = 1 sq. metre . | 30 ¼ sq. Yards= 1 sq.rod or Pole |
| 100 Sq. metres = 1 sq.decametre | 40 Sq . Rods =1 ROOD |
| 100 sq.decametres = I hectare | 4 Roods =1 acre |
| 100 hectares =1 Sq. Kilometre | 484 Sq. Yards = 1sq. chain ( or ) 10 cents |
| 10 sq. chains =1 acre |
Conversion factors (Sq. metres, Sq. yards, Sq. feet and Sq. inches)
| Sq. metres | Sq. yards | Sq. feet | Sq. inches |
| 1 | 1.196 | 10.7639 | 1550 |
| 0.8361 | 1 | 9 | 1296 |
| 0.0929 | 0-1111 | 1 | 144 |
| 0.00065 | 0.00077 | 0.0069 | 1 |
Conversion factors (Areas. Acres and Sq. yards)
| Areas | Acres | Sq. Yards |
| 1 | 0.0247 | 119:6 |
| 40.469 | 1 | 4840 |
| 0.0084 | 0.00021 | 1 |
Basic Units of volume in MKS & EPS
| Metric Units (MKS) | British Units (FPS) |
| 1000cu.millimetres
=1 cu.centimetre |
1728 cu. inches =
1 cu. foot |
| 1000cu.centimetres
= 1 cu.decimetre |
27 cu.feet= 1 cu. Yard |
| 1000 cu.decimetres
= 1 cu.metre |
Conversion factors (Cubic metres, Cu. yards and Imp. gallons)
| Cu. metres | Cu. yards | Gallons (IMP) |
| 1 | 1.308 | 219.96 |
| 0.764 | 1 | 168.178 |
| 0.0045 | 0.00595 | 1 |