The primary Indian legislation protecting centrally important monuments and archaeological sites — defining protected monuments, prohibited areas and the role of ASI.
heritage documentation
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.
heritage documentation
The Government of India body responsible for protecting, conserving and maintaining India's approximately 3,693 centrally protected monuments.
heritage documentation
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.
conservation
A digital methodology for creating and managing information about a building — combining 3D geometry with data about materials, systems, quantities and lifecycle.
bim
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.
gis
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.
heritage documentation
The mathematical system that defines how coordinates relate to real-world geographic locations — the standard for ensuring spatial data from different sources aligns correctly.
gis
The Indian government authority that regulates all civil aviation including drones — responsible for the Drone Rules 2021, the Remote Pilot Licence and the Digital Sky platform.
drone survey
The DGCA's online platform for drone registration and flight permission — all commercial drone operators in India must register their aircraft and file flight notices here.
drone survey
The dominant South Indian temple-building tradition, characterised by the pyramidal gopuram and vimana towers, originating with the Pallavas and reaching its peak under the Cholas and Nayaks.
temple architecture
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.
drone survey
The innermost chamber of a Hindu temple housing the principal deity — a small, dark, sacred space above which the vimana rises. Access is typically restricted in active temples.
temple architecture
Software that captures, stores, analyses and visualises spatial data — the standard platform for managing heritage site inventories, buffer zones and landscape analysis.
gis
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.
temple architecture
Surveyed reference targets placed in the scene before photogrammetry or drone survey, used to scale and georeference the output to real-world coordinates.
photogrammetry
The size in real-world units (typically cm/px) represented by one pixel in a drone or aerial image — the primary metric for spatial resolution in drone survey.
drone survey
A parametric BIM model of a historic building, built from survey data and enriched with heritage-specific attributes: period, condition, significance and material.
hbim
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.
heritage documentation
An open, ISO-standardised data format for sharing BIM models between different software platforms — the standard for interoperability in BIM-based heritage workflows.
hbim
India's largest non-governmental heritage organisation, responsible for documenting unlisted heritage, the INTACH Charter and professional capacity-building in conservation.
heritage documentation
The 2004 INTACH conservation standards document adapting Venice Charter principles to the Indian context — covering unlisted heritage, living heritage and traditional materials.
conservation
A BIM specification standard that defines how precisely each model element represents the real building — from approximate massing (LoD 100) to fabrication-level detail (LoD 500).
hbim
A remote sensing technology that measures distances by emitting laser pulses and recording the return time — producing accurate 3D point clouds of surfaces.
lidar
The pillared hall or pavilion in a South Indian temple — providing congregational space, processional routes and settings for rituals — ranging from small entrance halls to vast thousand-pillar halls.
temple architecture
A survey that records the actual dimensions of a building as-existing, producing measured drawings of plans, sections and elevations from direct physical measurement.
heritage documentation
The conservation principle of doing as much as necessary but as little as possible — prioritising stabilisation over restoration, and original fabric over replacement.
conservation
The science and technique of obtaining reliable measurements and 3D models from overlapping photographs — the standard method for heritage surface documentation at scale.
photogrammetry
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
The rectangular enclosure wall surrounding a South Indian temple complex, typically with gopuram towers at its gateways — major temples have two to four concentric prakarams.
temple architecture
The DGCA licence required to operate a drone commercially in India — obtained by completing an approved training programme and passing the DGCA examination.
drone survey
The conservation principle that interventions should be capable of being undone in future, preserving the option to apply better methods when they become available.
conservation
The process of aligning multiple individual laser scans into a single unified point cloud by identifying common reference points or overlapping geometry between scans.
lidar
An evaluation of why a heritage site or building matters — its historic, architectural, social and spiritual values — which guides what should be conserved and how.
conservation
The photogrammetric algorithm that reconstructs 3D geometry from a set of overlapping 2D photographs by tracking common feature points across images.
photogrammetry
The 1964 ICOMOS document that established the foundational principles of modern heritage conservation — authenticity, reversibility and minimal intervention.
conservation
The pyramidal tower that rises above the garbhagriha (main shrine) of a Dravidian temple — the architecturally primary element of the temple complex.
temple architecture