Land Measurement
Survey Field Details
The Field Measurement Book (FMB) is a crucial document used in land surveying, containing detailed measurements, subdivision numbers, and survey numbers near the boundary :
Key Features of FMB:
The boundary lines of a survey number are referred to as the “F Line” (Field Boundary Line).
A cross line, known as the “G Line,” represents the distance between points A and D.
Another G Line runs perpendicular from point E to point B.
If a survey stone is missing between two G Lines, its position can be determined using the measurements from the remaining G Line.
All measurements in the FMB are recorded in meters.
Scaling in FMB:
The scaling of land area within a single survey number varies based on size:
More than 15 acres → 1:5000 scale
Smaller areas → 1:2000 scale
Very small areas → 1:1000 scale
The FMB serves as a fundamental reference for land records, boundary verification, and property transactions, ensuring precise land measurement and documentation.
Methods for Land Measurement
Land measurement units vary across different regions. In Tamil Nadu, three types of measurement systems are commonly used:
Traditional Local Units – Kuzhi, Maa, Veli, Kaari, Marakka
British System Units – Square Feet, Cent, Acre
Metric Units – Square Meters, Ares, Hectares
However, all official land title documents are recorded using metric units, such as Ares and Hectares.
For accurate land measurements and property transactions, it is essential to understand these units and their conversions.
Land Measurement Units
1. Conversions for Acre
1 Acre = 100 Cent
1 Acre = 0.404694 Hectares
1 Acre = 40.5 Ares
1 Acre = 43,560 Square feet
1 Acre = 4046 Square meters
2. Conversions for Cent
1 Cent = 0.01 Acre
1 Cent = 0.004 Hectare
1 Cent = 0.405 Are
1 Cent = 435.54 Square feet
1 Cent = 40.46 Square meters
3. Conversions for Hectare
1 Hectare = 2.47 Acres
1 Hectare = 247 Cent
1 Hectare = 100 Ares
1 Hectare = 107,637.8 Square feet
1 Hectare = 10,000 Square meters
4. Conversions for Are
1 Are = 2.47 Cent
1 Are = 100 Square meters
1 Are = 1,076 Square feet
5. Length Units
10 Kon = 1 Nunnanu
10 Nunnanu = 1 Anu
8 Anu = 1 Kathirthugal
8 Kathirthul = 1 Thusumpu
8 Thusumpu = 1 Mayirnuni
8 Mayirnuni = 1 Nunnamal
8 Nunnamal = 1 Siru Kadugu
8 Sirukadugu = 1 Ellu
8 Ellu = 1 Nel
8 Nel = 1 Viral
12 Viral = 1 Saan
2 Saan = 1 Muzham
4 Muzham = 1 Paagam
6000 Paagam = 1 Kaadham
4 Kaadham = 1 Yosana
6. Land Measurement Conversion in Tamil Nadu
100 Square Meters = 1 Are
100 Ares = 1 Hectare
1 Square Meter = 10.764 Square Feet
2,400 Square Feet = 1 Manai
144 Square Inches = 1 Square Feet
435.6 Square Feet = 1 Cent
1,000 Square Links = 1 Cent
100 Cent = 1 Acre
1 Lakh Square Links = 1 Acre
2.47 Acres = 1 Hectare
1 Square Yards = 9 Square Feet
1 Acre = 4,840 Square Yards
1 Acre = 4,046.86 Square Meters
1 Acre = 43,560 Square Feet
1 Square Meter = 10.76 Square Feet
1 Guntha = 101.17 Square Meters
1 Guntha = 33 Feet * 33 Feet = 1,089 Square Feet
1 Kuzhi = 144 Square Feet
1 Kuzhi = 13.38 Square Meters
100 Kuzhi = 1 Maa
20 Maa = 1 Veli
3.5 Maa = 1 Acre
6.17 Acres = 1 Veli
18 Kol = 1 Kuzhi
240 Kuzhi = 1 Paadam
In conclusion, understanding and correctly using the appropriate land measurement system, along with accurate unit conversions, ensures precision in land management and legal matters. This is particularly important in regions where multiple measurement systems have been historically used.