The systematic recording of the physical fabric, condition and significance of a historic site or building, creating an accurate archive for conservation, management and research.

Measured Survey

A survey that records the actual dimensions of a building as-existing, producing measured drawings of plans, sections and elevations from direct physical measurement.

Condition Survey

A systematic physical inspection of a building or structure that records the state of each element — its material, any deterioration, and its urgency for intervention.

As-Built Survey

A survey that records the dimensions and condition of a structure as it actually exists, rather than as it was designed — often the starting point for heritage documentation.

Photogrammetry

The science and technique of obtaining reliable measurements and 3D models from overlapping photographs — the standard method for heritage surface documentation at scale.

Orthophoto

A geometrically corrected aerial or terrestrial photograph in which scale is uniform throughout, suitable for precise measurement — unlike a perspective photograph.

Point Cloud

A set of millions of data points in 3D space, each representing a measured location on a surface — the primary output of laser scanning and dense photogrammetry.

LiDAR

A remote sensing technology that measures distances by emitting laser pulses and recording the return time — producing accurate 3D point clouds of surfaces.

Terrestrial Laser Scanning

Ground-based 3D laser scanning where a scanner on a tripod captures a dense point cloud of its surroundings from a fixed position — the standard method for interior heritage documentation.

HBIM

A parametric BIM model of a historic building, built from survey data and enriched with heritage-specific attributes: period, condition, significance and material.

BIM

A digital methodology for creating and managing information about a building — combining 3D geometry with data about materials, systems, quantities and lifecycle.

GIS

Software that captures, stores, analyses and visualises spatial data — the standard platform for managing heritage site inventories, buffer zones and landscape analysis.

Buffer Zone

A legally defined protected area surrounding a heritage monument — in India, 100 m prohibited and 200 m regulated zones under the AMASR Amendment Act 2010.

Drone Survey

The use of an unmanned aerial vehicle (UAV) carrying a camera or sensor to capture data for mapping, photogrammetry or inspection — now standard for inaccessible heritage areas.

Venice Charter

The 1964 ICOMOS document that established the foundational principles of modern heritage conservation — authenticity, reversibility and minimal intervention.

Authenticity

In heritage conservation, the quality of a historic site or building that makes it a true and credible witness to its history — the principle that original material should be preserved.

Reversibility

The conservation principle that interventions should be capable of being undone in future, preserving the option to apply better methods when they become available.

Minimal Intervention

The conservation principle of doing as much as necessary but as little as possible — prioritising stabilisation over restoration, and original fabric over replacement.

INTACH Charter

The 2004 INTACH conservation standards document adapting Venice Charter principles to the Indian context — covering unlisted heritage, living heritage and traditional materials.

ASI

The Government of India body responsible for protecting, conserving and maintaining India's approximately 3,693 centrally protected monuments.

INTACH

India's largest non-governmental heritage organisation, responsible for documenting unlisted heritage, the INTACH Charter and professional capacity-building in conservation.

AMASR Act

The primary Indian legislation protecting centrally important monuments and archaeological sites — defining protected monuments, prohibited areas and the role of ASI.

NMA

The statutory body established under the AMASR Amendment Act 2010 to manage permissions for development within the regulated areas around ASI protected monuments.

Gopuram

The monumental gateway tower at the entrance of a Dravidian Hindu temple's enclosure wall — the dominant visual feature of major South Indian temple complexes.

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Heritage Documentation

Guides (45)