What Is FMB (Field Measurement Book)?

An FMB, or field measurement book, is a state survey record that shows a land parcel as a scaled sketch. It records the parcel’s boundaries, side measurements, subdivisions and neighbouring survey numbers. Buyers use it to confirm where a plot lies, how large it is and whether it matches the sale papers and the ground.

What Does FMB Stand For and What Does It Mean?

FMB stands for Field Measurement Book. The FMB full form refers to the survey department’s record of measurements taken during a cadastral survey, when surveyors measured and mapped every survey number in a village. In practice, FMB means a measured sketch of each survey number. In land surveying, it fixes a land parcel’s shape and position. In property records, it supports revenue entries such as patta and chitta.

What a Field Measurement Book Shows

An FMB sketch shows the physical identity of one survey number. Each item below helps you identify the parcel on paper and on site. Typical contents are:

Survey and subdivision numbers: These numbers link the mapped plot to your official ownership papers, such as the Sale Deed, Patta, or RTC.
Boundary lines and side measurements: These lines define the exact physical shape of your plot and show the government-recorded length of each border.
Neighbouring survey numbers: These digits mark the surrounding plots, helping you verify the government survey numbers of the adjacent plots of land (which you can use to check your neighbours’ boundary lines in official records).
Direction marks and physical features: Visual anchors like the north arrow, public roads, streams, or survey stones help you orient and locate the plot on the actual site.
Subdivision and extension lines: These internal lines reveal exactly how a larger ancestral plot was split into smaller sub-plots over time.

Why Does FMB Matter in Property Verification?

During property verification, the Field Measurement Book (FMB) sketch serves as the definitive legal map, confirming three core attributes: absolute identity, precise extent, and undisputed boundaries.

Absolute Identity: The official survey and subdivision numbers link the physical plot directly to your legal documents.
Precise Extent: Government-recorded side measurements establish the land’s true dimensions and area.
Undisputed Boundaries: The graphical sketch lines and adjacent survey numbers outline where your land ends and your neighbours’ plots begin.

Together, these elements let a buyer verify that the physical plot on the ground matches the land described in the title papers. While this verified data is critical for mutation (title transfer), registration, and bank loan due diligence, it is a technical map and not a substitute for legal ownership proofs like a Sale Deed.

1. How Do You Check Plot Boundaries Before Purchase?

Compare the FMB sketch with the sale papers, then with the site.

Note the survey and subdivision number on the sale deed.
Fetch the FMB for the same numbers.
Compare the sketch’s shape and side lengths with the deed’s boundary description.
Confirm that the neighbouring survey numbers marked on the FMB match the adjacent properties listed in your deed’s schedule.
Visit the physical plot with the FMB sketch to locate the official RTO survey stones (Bandi), boundary fences, and access roads.
Measure the actual boundaries on-site and flag any discrepancies between the physical ground dimensions and the government-recorded FMB data.

2. How Does FMB Help Reduce Boundary and Encroachment Disputes?

It gives all parties one recorded reference for the parcel’s lines. A disagreement can then be checked against the sketch rather than memory.

Establishes a single source of truth: It provides an official, government-sanctioned baseline reference, ensuring all parties rely on verified data rather than subjective memory.
Defines legal plot limits: It explicitly illustrates the government-demarcated boundary lines alongside adjacent survey numbers to isolate exactly where one property ends and another begins.
Exposes physical encroachments: By comparing the physical site layout with the scaled map, it instantly reveals illegally shifted fences, overlapping compound walls, or structural extensions.
Validates lawful subdivisions: It provides concrete proof that a partition or sub-plot extraction was officially recorded in the government revenue registry.
Facilitates boundary reconstruction: It provides licensed surveyors with technical engineering baselines (like G-lines and F-lines) to physically locate and restore missing corner survey stones.
Serves as admissible legal evidence: It equips lending banks, sub-registrars, and courts of law with a standard framework to decisively adjudicate property line conflicts.

FMB vs Sale Deed, Patta, and Survey Sketch

Each record answers a different question.

	FMB	Sale Deed	Patta	Survey Sketch
Purpose	Records parcel geometry	Transfers ownership	Revenue record of holder	Maps a parcel, often for a specific purpose
Information	Boundaries, sides, subdivisions, neighbours	Parties, price, boundaries, title chain	Holder, survey number, extent, classification	Dimensions and layout at survey date
Maintained or issued by	State survey and revenue department	Executed by parties, registered by Sub-Registrar	Revenue department	Government or licensed surveyor
Use in verification	Confirms location and shape	Proves transfer of title	Supports possession and tax records	Cross-checks current ground position

How to Read an FMB Sketch

Start with the survey number, then trace the lines. Follow these steps:

Match the survey and subdivision number with your property documents.
Trace each side and compare recorded dimensions. To understand how to calculate FMB measurements, check the map’s scale (usually 1:1000 or 1:2000) and convert the recorded field units into standard metres or feet to compare them directly with your sales deed. Check orientation and adjoining survey numbers against the north arrow and the deed.
For standard rectangular land parcels, simply multiply the calculated length by the breadth. If the plot has highly irregular angles or multiple sub-divisions, hire a licensed surveyor to compute the exact area using the technical ladder chart.
Flag mismatches with ground reality: different dimensions, shifted boundaries, missing subdivisions, or structures that do not match.

How Can You Get an FMB Sketch?

1. Online Steps via Mojini:

Open the official Bhoomi Mojini V3 Portal and select “Request for Survey Documents”.
Log in securely using your mobile number and the generated OTP.
Select your respective District, Taluk, Hobli, and Village.
Enter the Survey Number, along with the Surnoc or Hissa number if the land has been subdivided.
Select the required FMB Sketch or Hissa Map, pay the statutory online fee of Rs. 15 per document, and download your PDF instantly.

Also, you can apply through the Survey Settlement and Land Records (SSLR) Department, either online or at the local survey office. Keep your RTC (Pahani) extract and ID proof ready, as offline and field survey requests require them.

Note: While neighbouring states use the term FMB, Karnataka officially records these historical boundary files as Tippani and Mojini sketches. For partial land sales or new registrations, apply for a specialised 11E Sketch through the same portal before visiting the sub-registrar. Fees and portal paths are managed by the SSLR department and are subject to periodic state updates.

Before You Rely on an FMB Alone

An FMB shows geometry, not title. Old sketches may not reflect later subdivisions, sales, or physical changes, so a recent record provides a safer basis for comparison. Cross-check it against:

Sale deed and earlier title documents.
Patta and revenue records.
A current survey sketch.
Ground measurements.

Significant discrepancies, encroachment disputes, or conflicting records may require an official re-measurement. A licensed surveyor can then confirm the position.

Conclusion

An FMB is a practical way to check a parcel’s identity, boundaries and neighbours before you commit. The meaning of FMB is simple, but its use requires care. Read the sketch, compare it with your deed and visit the site. Ask your lawyer to review the title chain before you pay an advance. Treat the FMB as one piece of the due diligence file. Treat it as supporting evidence and verify title through legal documents.

FAQs

1. How to read an FMB sketch?

Read it in order. Each step narrows the check.

Find the survey number.
Confirm the subdivision number.
Compare dimensions on each side.
Trace the boundaries.
Check orientation using the north arrow.
Note the adjoining lands.

2. How to get an FMB sketch in Karnataka?

Apply through the Survey Settlement and Land Records (SSLR) Department, online or at the local survey office. Steps:

Open the official SSLR portal under Bhoomi and choose “Request for Survey Documents”.
Log in with your mobile number and OTP.
Select district, taluk, hobli and village.
Enter the survey number, plus the surnoc or hissa number if the land is subdivided.
Pick the FMB or Hissa Map, pay the fee and download the PDF.

Keep your RTC extract and ID proof ready, since offline and field survey requests ask for them. Karnataka also calls related records Tippani and Mojini sketches, and the online fee is about Rs. 15 per document. Portal names and fees change, so confirm on the official site.

3. What is a field book in surveying?

It is the surveyor’s record of field measurements. It holds readings, offsets and notes. An FMB sketch is the drawn parcel map prepared from such records. In short, the field book holds raw survey data, while the sketch provides a single survey number for buyers, officials, and lenders.