Archaeology and cultural heritage
The past leaves marks the ground forgets and orbit remembers.
Buried walls and ditches cannot hide what they do to roots.Crop-mark and soil-mark site prospection from orbit
Buried archaeological features alter soil moisture and nutrients, forcing differential crop growth that multispectral and hyperspectral satellites can read. Timing is everything: a single misplaced acquisition can miss the window by a full year.
Sentinel-2 MSIPlanet SuperDovePRISMA (ASI)
Sand hides what it cannot absorb. Radar finds it anyway.SAR subsurface penetration for desert archaeological site detection
Long-wavelength SAR penetrates dry desert sediment to reveal buried structures, palaeochannels and ancient roads invisible at the optical surface. L-band and P-band backscatter from subsurface dielectric contrasts that optical sensors simply cannot reach.
ALOS-2 PALSAR-2ESA BIOMASSSentinel-1 C-band SAR
Looters leave shadows. Satellites count them.Looting-pit detection and monitoring at conflict-zone heritage sites
Illegal excavation pits produce bright soil disturbances visible in sub-metre optical imagery. Change detection between pre- and post-conflict acquisitions has quantified thousands of pits at Apamea, Abusir el-Malek, and sites across southern Iraq.
WorldView-3 (Maxar)WorldView-2 (Maxar)Pléiades-1A/1B (Airbus)
Shells erase centuries. Satellites record the hour it happened.Conflict damage assessment at UNESCO and ICOMOS-listed heritage sites
Bi-temporal SAR coherence loss and very-high-resolution optical change detection can document structural collapse at listed heritage sites within days of an event, supporting legal evidence chains and post-conflict recovery planning.
Sentinel-1 C-band SAR (ESA)WorldView-2 and WorldView-3 (Maxar)Pléiades-1A and 1B (Airbus)
Buried walls stay warm at 3 a.m. Soil does not.Thermal infrared detection of buried structures and voids
Subsurface masonry and compacted surfaces retain heat differently from surrounding soil, producing thermal anomalies detectable in pre-dawn satellite imagery. ASTER TIR and Landsat TIRS have confirmed this at sites across Egypt and the Near East, though their coarse resolution limits detection to large features.
ASTER TIRLandsat 8 / 9 TIRSECOSTRESS
The bulldozer moves at night. The archive remembers every morning.Urban encroachment monitoring on legally protected archaeological zones
Informal construction within gazetted heritage buffer zones can be tracked quantitatively using time-series change detection in medium- and high-resolution optical imagery. This page covers classification methods, revisit requirements, documented cases in Egypt and Mesopotamia, and how satellite evidence feeds UNESCO and ICOMOS reporting obligations.
Sentinel-2 MSIPlanet DoveWorldView-2 / WorldView-3
Monuments move. Millimetres matter. Satellites catch both.InSAR ground deformation monitoring at heritage sites and monuments
Interferometric SAR detects ground displacement at millimetre scale, revealing subsidence and differential settlement that threaten monuments and buried stratigraphy before visible damage appears. This page explains how Sentinel-1, COSMO-SkyMed and TerraSAR-X are applied at documented heritage sites, and where the technique fails.
Sentinel-1A/B (ESA)COSMO-SkyMed (ASI)TerraSAR-X / TanDEM-X (DLR)
Harbour walls drowned for millennia. Clear water and physics make them visible again.Submerged archaeological site survey using satellite-derived bathymetry
Multispectral satellite imagery can resolve bottom features through optically shallow water using radiative transfer inversion, revealing submerged harbour moles, inundated field systems and drowned architecture to depths of roughly two to fifteen metres where turbidity allows.
Sentinel-2 MSIWorldView-2 / WorldView-3ICESat-2 ATLAS
The mound is invisible to the eye. It is not invisible to elevation.High-resolution DEM analysis for landscape and earthwork archaeology
Spaceborne and airborne lidar DEMs reveal earthworks, hollow ways and field systems as micro-topographic anomalies of tens of centimetres. Processing methods such as local relief modelling and sky-view factor visualisation make these features legible where optical imagery shows nothing.
TanDEM-X WorldDEMCopernicus DEM GLO-30GEDI (Global Ecosystem Dynamics Investigation, ISS)
Rivers vanish. The soil they shaped remembers for millennia.Palaeochannel and ancient route mapping using multitemporal spectral analysis
Abandoned channels and ancient caravan routes leave grain-size, moisture and compaction signatures readable in SWIR and thermal bands. Multitemporal PCA and band-ratio stacks reveal them where the eye sees only desert.
Landsat 8/9 OLI-TIRSSentinel-2 MSIASTER
Tourists leave. Their car parks, paths and vendor stalls do not.Satellite monitoring of visitor infrastructure pressure at heritage sites
Car parks expand, informal paths multiply, and vegetation thins under visitor pressure at heritage sites. Satellite imagery at multiple resolutions can track each of these changes before they become irreversible, feeding directly into UNESCO site-management reporting.
Pléiades-1A/1BPlanet DoveSentinel-2 MSI
Mounds hide in plain sight. Physics and geometry find them.SAR and optical fusion for systematic tells and burial mound mapping
Archaeological tells and burial mounds produce distinctive SAR backscatter asymmetries and DEM slope signatures that separate them from natural hillocks. Fusing Sentinel-1, ALOS-2 and high-resolution optical data in machine-learning classifiers makes systematic survey across thousands of square kilometres practical, though field validation remains non-negotiable.
Sentinel-1 C-band SAR (ESA)ALOS-2 PALSAR-2 L-band SAR (JAXA)Copernicus DEM GLO-30
Darkness is a legal condition. Satellites can audit it nightly.Nighttime light anomaly detection at dark-sky heritage buffer zones
VIIRS Day/Night Band and the DMSP-OLS archive let analysts track artificial-light intrusion into legally protected dark-sky buffers around heritage sites and ancient observatories, separating permanent infrastructure from fires and festivals.
VIIRS Day/Night Band (Suomi NPP / NOAA-20)DMSP-OLS archiveSentinel-2 MSI
The pigment has been there ten thousand years. Salt is winning.Hyperspectral pigment and weathering mapping at open-air rock-art sites
Airborne and spaceborne hyperspectral imagery can distinguish mineral pigments, biological crusts and salt efflorescence on rock-art surfaces without physical contact, turning spectral physics into a condition-monitoring tool for sites too fragile or remote to survey on foot.
ASI PRISMADESIS (DLR / Teledyne FLIR on ISS)AVIRIS-NG (NASA JPL, airborne)
Floodwater retreats. The sediment it leaves behind does not.Floodplain alluvial site inundation and sediment burial risk mapping
Seasonal floods and dam operations bury unexcavated alluvial sites under fresh sediment every year. Sentinel-1 SAR, SRTM elevation models and Landsat multispectral data can map inundation extent, quantify deposition, and rank site risk before the next flood pulse arrives.
Sentinel-1 C-band SAR (ESA)SRTM Digital Elevation Model (NASA/NGA)Landsat 8/9 OLI (USGS/NASA)
The ground is moving. The archive it contains is not replaceable.Permafrost thaw and thermokarst damage at Arctic heritage sites
Permafrost thaw is physically dismantling Norse, Indigenous and Cold War heritage sites across the Arctic. InSAR displacement time-series and land surface temperature records let site managers see the damage accumulating before a wall collapses or a midden slides into the sea.
Sentinel-1 SAR (C-band, 5.6 cm wavelength)MODIS Land Surface Temperature (Terra and Aqua)VIIRS Land Surface Temperature (Suomi-NPP and NOAA-20)
Fire retreats in days. The erosion it triggers runs for years.Wildfire burn-scar analysis and post-fire erosion risk at heritage sites
Wildfires strip the vegetation that holds soil over buried archaeology. Mapping burn severity with dNBR and modelling post-fire erosion risk tells site managers where the ground is about to move, and how fast.
Landsat 8/9 OLISentinel-2 MSISentinel-1 SAR (C-band)
The tide does not wait for a recording permit.Coastal erosion monitoring at maritime and littoral heritage sites
Satellite time-series can quantify shoreline retreat at coastal forts, middens and shipwreck sites years before a site is lost, giving heritage managers defensible rates and ranked priorities for emergency recording.
Sentinel-2 MSILandsat 5/7/8/9 (USGS archive)PlanetScope
The canals stopped flowing. The soil remembers every one.Ancient irrigation canal and field-system network mapping
Extinct irrigation networks leave moisture, texture and elevation signatures that persist for millennia. Combining declassified CORONA photography, Sentinel-1 SAR, ALOS-2 PALSAR-2 and Sentinel-2 spectral indices can reconstruct field systems across thousands of square kilometres before modern agriculture erases them.
CORONA (KH-4 / KH-4A / KH-4B, USGS declassified archive)Sentinel-1 C-band SAR (ESA)ALOS-2 PALSAR-2 L-band SAR (JAXA)
The 1960s spies photographed your site. Now compare.CORONA and KH-4 declassified imagery baseline for site-loss quantification
Declassified CORONA and KH-4 reconnaissance imagery, freely archived by the USGS, gives archaeologists a pre-disturbance baseline stretching back to 1960. Co-registered against modern sensors, it makes site loss measurable rather than anecdotal.
CORONA KH-4 / KH-4A / KH-4B (USGS archive)WorldView-2 / WorldView-3 (Maxar)PlanetScope
Grass does not lie about what is buried underneath it.Vegetation stress index mapping for buried feature detection beyond crop-marks
Buried walls, ditches and pits alter soil moisture and depth in ways that show up as differential plant stress, even where no crops grow. Red-edge and SWIR spectral indices can resolve those stress patterns from orbit, extending systematic site prospection into grassland, scrub and managed woodland.
Sentinel-2 MSIWorldView-3PlanetScope
Salt blinds optical sensors. Microwaves read what lies beneath.Salt flat and sabkha buried site detection using microwave emissivity
Passive microwave brightness temperatures from SMOS and AMSR2 reveal subsurface archaeological deposits in sabkha and playa environments where surface salt confounds optical and SAR methods. Site-complex scale detection only; individual features remain below the resolution floor.
SMOS (ESA)AMSR2 (JAXA, GCOM-W1)ALOS-2 PALSAR-2 (JAXA)
Stone does not just erode. It cooks, cycles and crystallises.Land surface temperature microclimate mapping for open-air heritage conservation
Thermal infrared data from Landsat TIRS and ECOSTRESS reveals heat-stress microzones across open-air heritage sites where temperature cycling drives salt damage and biological colonisation. Site managers gain spatial evidence for shading, drainage and visitor routing decisions.
Landsat 8/9 TIRSECOSTRESS (ISS-mounted)ASTER TIR
Engineers buried these roads for millennia. Radar and elevation data disagree.Satellite detection of ancient roads, causeways and processional ways
Roman roads, Mayan sacbeob and Andean qhapaq ñan leave measurable signatures in high-resolution DEMs, SAR backscatter and multispectral imagery. Satellite workflows now detect linear anthropogenic features that ground survey alone would take decades to map.
TanDEM-X (DLR)ALOS World 3D (JAXA)Sentinel-1 SAR (ESA)
The wood survives while the water table holds. Satellites watch the water.Peatland and wetland heritage site water-table monitoring via SAR coherence
Drainage, drought and agricultural abstraction that lower peatland water tables expose millennia-old organic material to irreversible aerobic decay. Sentinel-1 InSAR coherence and backscatter change provide landscape-scale early warning, validated against dipwell records from Irish and Scandinavian raised bogs.
Sentinel-1 SAR (C-band, 5.405 GHz)Sentinel-2 MSIMODIS (Terra/Aqua)
Sand buries a site slowly. Deflation strips it in a season.Dust storm deflation and aeolian sand movement monitoring at desert heritage sites
Desert heritage sites face two opposing threats: dune encroachment that buries structures, and deflation that strips the sediment protecting them. Satellite aerosol, optical and change-detection data can track both processes at scale.
MODIS MAIAC AOD (Terra/Aqua)VIIRS aerosol optical depth (Suomi-NPP / NOAA-20)Sentinel-2 MSI
Looters move earth. Stereo satellites measure exactly how much.Spoil-heap volume estimation at illegally excavated sites using stereo DSMs
Differencing pre- and post-disturbance digital surface models from commercial stereo satellite imagery quantifies the volume of material removed by illegal excavation, producing metric evidence usable in criminal and civil proceedings.
WorldView-1/2/3 (Maxar)Pleiades-1A/1B (Airbus)Pleiades Neo 3/4 (Airbus)
The water table rises silently. The tell collapses publicly.Groundwater salinity and rising damp monitoring at mudbrick heritage sites
Rising groundwater carries dissolved salts into mudbrick fabric, where crystallisation cycles fracture walls from within. Sentinel-1 InSAR and Sentinel-2 SWIR bands can detect the precursors before a structure fails.
Sentinel-1 SAR (C-band, ESA)Sentinel-2 MSI (ESA)ALOS-2 PALSAR-2 (JAXA)
The canopy protected these sites for centuries. Chainsaws work faster than clouds.Forest clearance detection and heritage site exposure risk in tropical regions
Tropical forest cover is the primary physical defence of countless unexcavated heritage sites. Sentinel-1 SAR and optical NDVI time-series together detect clearance events even through persistent wet-season cloud, flagging exposure risk before looters or machinery cause irreversible damage.
Sentinel-1 SAR (C-band, ESA)Landsat 8/9 OLI (USGS/NASA)Planet NICFI tropical forest data
A monument shrinks. Its shadow tells you first.Monument height change detection using shadow length photogrammetry
Shadow length photogrammetry extracts height change in standing monuments and earthworks from very-high-resolution optical imagery at known solar angles, offering non-contact structural monitoring where ground access is impossible or politically fraught.
WorldView-2 / WorldView-3Pleiades NeoSPOT-6 / SPOT-7
Stone, brick and plaster look alike to the eye. Not to SWIR.Spectral mixture analysis of surface material composition at heritage sites
Linear spectral unmixing applied to hyperspectral and SWIR imagery maps the areal proportions of construction materials across heritage site surfaces, supporting condition assessment without a single field visit.
ASI PRISMAWorldView-3DESIS (ISS)
The ground above a void moves. Radar notices before anyone does.Radar interferometry detection of subsurface tomb cavities and hypogea
Repeat-pass InSAR detects millimetre-scale surface strain caused by differential settling above shallow rock-cut tombs, catacombs and hypogea. Sentinel-1 and COSMO-SkyMed archives supply the temporal density needed to separate cavity signals from seasonal moisture noise.
Sentinel-1 (C-band SAR, ESA)COSMO-SkyMed (X-band SAR, ASI)TanDEM-X (X-band SAR, DLR)
Masonry cannot speak. Millimetre-scale motion can.Construction and traffic vibration microdeformation monitoring at standing monuments
Persistent-scatterer InSAR detects sub-centimetre differential movement in historic masonry driven by nearby construction, tunnelling or heavy traffic, giving heritage managers quantified early warning before visible damage appears.
Sentinel-1 (C-band SAR, ESA)COSMO-SkyMed (X-band SAR, ASI)Capella Space (X-band SAR, commercial)
One dry summer reveals what ten wet years buried. One image is never enough.Multispectral ploughzone feature-density mapping for developer impact assessment
A single crop-mark season is an unreliable basis for planning consent. Multitemporal multispectral stacking across several growing seasons builds a probability surface of buried feature density that surveyors and planners can actually trust.
Sentinel-2 MSIPlanetScope SuperDoveWorldView-3 VNIR/SWIR
Waterlogged ground destroys radar coherence. That loss marks where timber survives.SAR coherence mapping of seasonal waterlogging and anaerobic preservation zones
Repeat-pass SAR coherence drops sharply when soil moisture rises between acquisitions. Mapping that seasonal loss identifies ground where anaerobic conditions preserve organic archaeological material, giving heritage managers a spatially explicit preservation envelope.
Sentinel-1 C-band SAR (ESA)ALOS-2 PALSAR-2 L-band SAR (JAXA)RADARSAT-2 C-band SAR (MDA)
Pit counts lie. Cubic metres do not.Stereo satellite DSM time series for tell volume loss quantification
Sub-metre stereo satellite imagery converts archaeological tell damage from anecdote into auditable volume. DSM differencing across epochs measures what was removed, redeposited, or bulldozed across the entire mound, not just the pits a human analyst can count.
Pleiades 1A / 1B (Airbus)WorldView-1 / WorldView-2 (Maxar)CORONA KH-4 / KH-4A / KH-4B (declassified USGS)
Stone weathers slowly. Satellites notice before conservators can.Multitemporal spectral change detection of heritage stone surface weathering
Multispectral time series from Sentinel-2 and WorldView-3 can track surface darkening, biological crust growth, salt efflorescence and spalling on exposed masonry, but atmospheric correction quality determines whether the signal is real or artefact.
WorldView-3 (Maxar)Sentinel-2 MSI (ESA)Landsat 8/9 OLI-TIRS (USGS/NASA)
Displaced people need shelter. Heritage buffer zones need watching. Both are true.Refugee and IDP camp expansion monitoring within heritage site buffer zones
Rapid informal settlement growth inside UNESCO and national heritage buffer zones is measurable from orbit at weekly cadence. Very-high-resolution optical change detection can map tent fabric, prefab shelters and earthworks without criminalising displacement.
Pleiades NeoWorldView LegionPlanetScope SuperDove
GPR tells you what is there. Satellites tell you where else to look.Fusion of ground-penetrating radar survey grids with satellite DEM for site-wide extrapolation
Spatially limited GPR transects can be extrapolated across an entire site using satellite-derived micro-topography and spectral indices as geostatistical covariates. The method is published and useful; the uncertainty is real and grows fast with transect spacing.
TanDEM-XSentinel-2 MSIWorldView-3
The harbour silted up. The wavelengths still remember its depth.Satellite bathymetry and sediment mapping of silted ancient harbours and coastlines
Ancient harbour basins buried under sediment or shallow water leave spectral signatures that multispectral satellites can decode. Satellite-derived bathymetry and SWIR sediment mapping reconstruct lost coastlines without a single dive or trench.
Sentinel-2 MSIWorldView-2 multispectralLandsat 8/9 OLI
A 30 cm bank is invisible at noon. At 10 degrees, it is not.Solar illumination angle optimisation for earthwork and enclosure shadow enhancement
Very-high-resolution satellite imagery acquired at low solar elevation angles can reveal earthworks, ditches and banks of only 20–50 cm relief by the shadows they cast. Systematic tasking geometry, not sensor resolution alone, determines what survives detection.
Pleiades 1A/1BPleiades Neo (3/4)WorldView-2