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Archaeologists map underwater ruins in stages: they use remote sensing to search a broad area, investigate promising features, then build detailed image records of selected sites. Sonar can reveal bottom shape and objects that stand out in acoustic imagery; photogrammetry turns overlapping photographs into measured visual models. Navigation, reference points and field notes connect those products to real places and archaeological context. The right combination depends on the survey question, water depth, visibility, terrain and site conditions.
Why a survey uses more than one kind of map
“Underwater map” can describe several different products. A side-scan sonar image is an acoustic view of the seafloor, useful for searching for features with relief. A multibeam echosounder records bathymetric data across a swath beneath the survey platform. A photomosaic or textured 3D model is assembled from photographs and can show visible surfaces in far greater visual detail at a selected site. These outputs answer different questions; they are not interchangeable versions of the same map.
The sequence matters. A team may first search a large area for anomalies, use bathymetry to understand the shape of the bottom, and then collect close-range imagery at a known site or feature. If the archaeological question concerns something buried below sediment, a sub-bottom profiler may be more relevant than a camera. No single instrument identifies every kind of ruin or provides every kind of evidence. The Naval History and Heritage Command (NHHC) describes these tools as choices for different survey objectives in its archaeological fieldwork guidance.
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Before choosing equipment, define what the team needs to find out: where a feature is, how it rises above or sits within the seabed, what its visible construction looks like, or whether an anomaly may continue beneath sediment. The platform also matters. A towed instrument, vessel-mounted system, diver and remotely operated vehicle (ROV) have different access and safety considerations. NHHC identifies autonomous underwater vehicles (AUVs) as options for large swaths or high-resolution surveys, and ROVs for deep or hazardous environments.
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| Method | What it records | Best-fit question | Important limit |
|---|---|---|---|
| Side-scan sonar | Planimetric acoustic imagery of the bottom | Where are objects or structures that create acoustic relief? | It is not the same product as bathymetry or a photographic record. |
| Multibeam echosounder | Bathymetric data across a swath beneath the platform | What is the shape and depth of the seafloor around a site? | It complements side-scan imagery rather than replacing it. |
| Sub-bottom profiler | Information about features beneath the seabed | Could an anomaly or archaeological feature be buried by sediment? | It answers a different question from imaging exposed surfaces. |
| Diver or ROV photogrammetry | Overlapping visible-light images processed into mosaics and 3D products | What does a selected, imageable area look like in detail? | Image quality and coverage depend on visibility, route planning and image overlap. |
This is a decision aid, not a ranking of accuracy. The cited guidance does not establish a universal best instrument or a cross-site accuracy comparison. A survey can combine methods where their different records help answer the same archaeological question.
Plan the survey and preserve location information
A sensor record becomes useful archaeological evidence only when its location and collection conditions are understood. NHHC recommends accurate navigation that continuously determines the position of both the vessel and sensor, calibration, and digital logging of position fixes. The sensor’s position may not be identical to the vessel’s, so recording both matters when interpreting where an observation falls.
Survey planning also includes documenting procedures and major events that might affect interpretation. Where relevant, record environmental and burial conditions such as bottom type, salinity, currents, turbidity and marine communities. Those observations help explain why a feature may appear distorted, obscured or absent in a survey product; they also give later researchers context for evaluating the record.
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Coverage choices are operational decisions rather than universal settings. For sonar, range, depth, target size and the survey goal affect choices such as frequency, sensor altitude and lane spacing. For photographic work, the planned route, distance from the subject and overlap determine whether images can be aligned into a coherent record. Log the choices and conditions rather than treating a clean-looking image as proof of complete coverage.
Use sonar to search, then interpret the right product
Side-scan sonar: acoustic views of relief
Side-scan sonar sends acoustic energy toward the seafloor and records returning signals as an image. Differences in echo and shadow can make features that rise above the bottom stand out, which is why the method is useful for broad searches for relief-bearing objects or structures. The result is an acoustic image, not a photograph: its patterns need interpretation and should be considered alongside location data and other observations.
NHHC gives typical side-scan frequency ranges of 100–400 kHz for broader, lower-resolution surveys and 600–1600 kHz for narrower, higher-resolution surveys. These are guidance examples on the NHHC page, whose publication year is not stated there; they are not universal instrument specifications or a guarantee of a particular resolution. The same guidance discusses 300–500 kHz for cultural-resource survey at a stated line spacing, but the frequency should not be treated as a stand-alone prescription. Teams choose settings and survey lanes in relation to the equipment, range, depth, environment and target.
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Multibeam and buried-feature surveys
A multibeam echosounder records bathymetric data across a swath under the survey platform. That bathymetry can show the shape of the bottom around a site and complement side-scan imagery, but it is a distinct data product. For a target thought to be buried, a sub-bottom profiler may help investigate beneath the sediment where surface imagery cannot show the feature. The method is selected for the evidence sought, not because it produces a more complete version of every other survey.
Remote sensing narrows the area for closer investigation; it does not by itself establish what an anomaly is. Archaeological interpretation depends on the feature’s position, surrounding context and supporting observations. A survey record should preserve enough information to revisit why a team considered a feature significant and how its interpretation was reached.
Build photomosaics and 3D models from overlapping images
Photogrammetry uses many overlapping photographs to reconstruct visible surfaces. NOAA Ocean Exploration defines it as “a method of approximating a three-dimensional (3D) structure using two dimensional images.” Its photogrammetry overview was published June 22, 2020, and last updated October 29, 2024.
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- Plan image routes. A diver or ROV moves along planned routes, capturing still images from different distances and angles so adjacent images share visible details. Video can also be converted into still frames.
- Collect sufficient overlap. NHHC guidance recommends at least 50% overlap in both directions for underwater image acquisition intended for photomosaics. It gives a typical collection altitude of 2.5–5 m, depending on water clarity. These are operational recommendations, not universal guarantees of model quality; actual routes and distance need to suit the site and visibility.
- Align shared features. Processing identifies landmarks that appear in multiple images and uses those matches to align and adjust the photographs. Images without enough shared detail, or where visibility obscures features, can make reconstruction difficult.
- Generate geometric products. The aligned imagery can produce a point cloud, then a surface mesh and texture. The resulting outputs may include a photomosaic, an orthographic view or a textured 3D model.
- Connect the model to the real site. Reference points visible in photographs can bind image coordinates to real-world coordinates and help establish scale. The French Ministry of Culture explains this role of reference points in its guide to 3D modelling in underwater archaeology.
A visually detailed model is not automatically geographically dependable. If the image geometry has no reliable reference control, it may describe the shape of a site without establishing where that shape lies in a coordinate system or its real-world scale. Navigation data and visible reference points serve different but related purposes: navigation locates survey observations, while reference control ties the photographic reconstruction to measurements and coordinates.
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Combining sonar and photogrammetry can connect broad-area discovery to detailed documentation. Acoustic imagery may flag a feature with relief; bathymetry can place it within the surrounding seabed; close-range photographs can record exposed surfaces and form a model for later study. When a feature is buried, the question may call for subsurface sensing rather than more photographs. The combination is useful because each method records different evidence at a different scale.
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Keep archaeological context with the map
A map or model is only one part of the site record. NHHC advises recording provenience on the site map, documenting contextual relationships such as structures and layers, and completing documentation before disturbing a site. That context is essential: an object’s position relative to structures, deposits and other finds can carry archaeological meaning that cannot be recovered from an isolated model alone.
Archive the material needed to understand and reuse the survey, not just its most polished image. The Archaeology Data Service marine guide, dated 2024 and written as UK-oriented guidance, describes a possible archive spanning 3D models, GIS mapping, imagery, video, geotechnical and dating data, instrument logs, ecological surveys and reports. Preserve metadata and logs that document collection, processing and interpretation; they explain how raw observations became the products researchers later consult.
- Retain original images and the processed photomosaics or models.
- Keep GIS products and positioning records that connect observations to locations.
- Store instrument logs, survey procedures, calibration information and notes on major events.
- Document environmental conditions, site context and the reasoning behind interpretations.
- Plan archival formats and descriptions so another researcher can understand what each file represents.
What makes an underwater map trustworthy?
Trustworthiness comes from a traceable chain, not visual detail alone: a clear archaeological objective, suitable instruments, recorded navigation, documented conditions, adequate photographic overlap where images are used, reference control, and preservation of the records behind the final products. A photomosaic can make a site legible; bathymetry can describe its setting; acoustic imagery can help locate relief. Their value is strongest when each is interpreted for what it actually measures and the archaeological record preserves how it was made.
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