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Glossary

# Field Measurement Book (FMB)

A parcel-level survey record that can show recorded geometry, measurements, subdivision, and adjoining survey references where those details appear.

## What is an FMB?

A Field Measurement Book (FMB) sketch is parcel-level survey evidence tied to a survey number and, where applicable, a subdivision. Depending on the returned record, it can show recorded geometry, measurements, and adjoining survey references. It is different from an urban TSLR revenue extract and from a whole-village map.

## Why FMB matters in land deals

Use the FMB to compare the parcel identifier, recorded shape, measurements, subdivision, and adjoining references with the deed and revenue extract. A difference is a reason to investigate the identifiers, update history, and field conditions; it is not by itself proof of encroachment, invalid title, or ownership.

## How to read an FMB sketch

Start with the survey and subdivision printed on the source record. Note only the measurements, orientation, adjoining survey references, scale, symbols, or features that the particular sketch actually displays. Preserve the retrieval inputs and source pages, then ask a qualified surveyor to relate the record to present markers, measurements, occupation, access, and adjoining parcels on the ground.

## Related Terms

[Survey NumberA unique numeric identifier assigned to each land parcel by the Revenue Department during the original land survey.](/glossary/survey-number)[Patta (Land Ownership Certificate)A revenue document issued by the Tamil Nadu government that records the current owner of a land parcel.](/glossary/patta)[Due Diligence (Land)A comprehensive investigation of a land parcel's legal title, physical condition, regulatory compliance, and financial viability before purchase.](/glossary/due-diligence)

## Keep exploring

Connect your land intelligence workflow with these powerful tools.

[Document VerificationVerify FMB sketches against Patta records and flag extent discrepancies.](/features/document-verification)[Field ExecutionCoordinate field teams to cross-check FMB boundaries with physical site conditions.](/features/field-execution)[How to retrieve an FMB sketch in Tamil NaduSearch Tamil Nadu eServices for a rural or Natham FMB sketch or an urban TSLR boundary sketch.](/tools/tamil-nadu/fmb-tslr-sketch)[Compare Tamil Nadu land recordsSeparate the parcel sketch from Patta/Chitta, the TSLR extract, A-Register, and registration search.](/blog/patta-chitta-fmb-ec-tamil-nadu-guide)[Tamil Nadu land-record hubChoose the record that answers the immediate parcel-check question.](/states/tamil-nadu)

Last verified 30 September 2026

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