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Archaeologists normally survey a site in stages before opening excavation trenches. They begin with records and maps, inspect the ground systematically, and then use aerial imagery or geophysical instruments to look for buried patterns. The sequence is adapted to the research question, geology, vegetation, expected depth, legal status of the land and available time. Survey results help decide whether excavation is justified, where it should be concentrated and what methods are least likely to damage significant deposits.
What “survey” means before an excavation
Survey is the evidence-gathering phase used to understand a place before substantial soil is removed. It can include documentary research, landscape observation, remote sensing, geophysics and carefully designed sampling. No single technique reveals everything. A walkover may miss features hidden by crops, while a magnetometer may miss a feature that has little magnetic contrast. Archaeologists therefore combine methods when each answers a different part of the question.
The Chartered Institute for Archaeologists (CIfA) describes the purpose of geophysical work this way: “An archaeological geophysical survey will determine, as far as is reasonably possible, the nature of the detectable archaeological resource within a specified area using appropriate methods and practices.” The qualification matters: a survey characterizes what its methods can detect; it does not promise a complete inventory of everything underground.
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Collect maps, documents and previous investigations
A project usually starts with historic maps, aerial photographs, satellite or other imagery, land records, site inventories, published reports and notes from earlier surveys or excavations. Researchers look for former buildings, roads, field boundaries, earthworks, industrial activity, known burials and changes in drainage or land use. Modern development records can explain disturbances that might otherwise be mistaken for archaeological remains.
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The National Park Service and North Carolina’s Office of State Archaeology both emphasize advance archival and historical research. Documentary evidence can identify high-probability areas and resources that leave no obvious surface trace. It can also show where an apparently promising area was already graded, ploughed or excavated.
Turn background information into testable expectations
Records are a starting model, not a final answer. A predictive map might suggest that settlement clustered near a former watercourse, yet field evidence may place activity elsewhere. Archaeologists write down the expectations they intend to test: for example, whether a mapped building survives below a lawn, whether a ditch continues across a parcel or whether industrial burning occurred in a particular zone. Clear questions make it easier to choose an efficient survey design and to recognize when evidence contradicts the historical account.
2. Define the project and secure permissions
Set the area, questions and recording standard
The project design identifies the survey boundary, target remains, sampling or coverage strategy, coordinate system, equipment, staffing, schedule and planned outputs. It should state how observations and instrument data will be named, located, backed up and interpreted. Grid spacing, transect intervals and sample locations need to be appropriate to the smallest feature the team hopes to detect; a widely spaced survey cannot reliably answer a question about narrow, discontinuous features.
Check land and heritage requirements in the correct jurisdiction
Permission and licensing depend on the land and the work proposed. Landowner consent is a basic requirement for private property, while heritage authorities may require a separate approval. Suffolk County Council’s guidance in England recommends a short project design, landowner permission and depositing results with its archaeological service. Historic England states that Section 42 consent is required for geophysical work over a scheduled monument or another protected place in England. These rules should not be generalized to every country or site.
On National Park Service land, the agency notes that archaeological studies may legally be conducted only by NPS employees or permitted individuals. North Carolina guidance likewise sets state-specific expectations for survey control and reporting. Before collecting data, the project lead should confirm which authority receives the report, whether finds or samples must be curated and whether access, safety or environmental permits apply.
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3. Conduct a systematic walkover or surface inspection
What the team records
A walkover (also called reconnaissance, above-ground survey or surface inspection) is organized walking rather than casual sightseeing. The team follows planned transects or a grid, records the route and conditions, and notes visible evidence such as earthworks, wall lines, foundations, terracing, mounds, hollow ways, soil changes and artifacts exposed on the surface. Each observation receives a location and description, with photographs or sketches where useful.
Surface visibility is logged because it affects what can be seen. Short grass, freshly ploughed soil and bare ground may expose material, whereas dense crops, leaf litter, standing water or construction spoil can conceal it. Weather, light and recent land use are also relevant. A negative walkover means that no evidence was visible under those conditions; it does not demonstrate that the ground is archaeologically empty.
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Clusters of pottery, brick, slag or worked stone may suggest activity areas, but displaced material can travel downslope or be spread by ploughing. Visible banks may be natural, modern or ancient. Archaeologists compare observations with the documentary model and mark areas where remote sensing, augering or limited sampling could resolve uncertainty. The National Park Service definition stresses that information is recorded and collected systematically from the surface; the method is valuable precisely because its coverage and limitations are explicit.
4. Add aerial imagery and other remote sensing
Aerial photographs, satellite images, lidar-derived terrain models, radar or infrared imagery can reveal patterns across a large area without disturbing deposits. Crop or soil marks may outline buried ditches and walls; shadows can emphasize low earthworks; lidar can make subtle topography visible beneath some vegetation. The usefulness of each image depends on the target and environmental conditions. Moisture, season, sun angle, vegetation growth, image resolution and later disturbance all influence what appears.
Remote observations are interpreted alongside maps and field notes, not treated as self-explanatory pictures. A straight line in an image could be a pipeline, drainage trench, geological boundary or archaeological wall. The team records the image date, sensor or source, processing steps and georeferencing so another researcher can evaluate the interpretation.
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5. Choose geophysical methods for the target and the ground
Geophysics measures contrasts produced by buried materials or structures. Method selection depends on the research question, expected depth and size of the target, soil and geology, moisture, surface obstacles, vegetation, electromagnetic interference, area to be covered and time available. Historic England’s current advice (updated 3 July 2025) stresses that no instrument is universally best.
| Method | What it measures or observes | Where it helps | Important conditions and cautions |
|---|---|---|---|
| Archival research and previous records | Maps, documents, imagery, inventories and earlier investigations | Provides context and a testable survey design | Records may be incomplete, biased or contradicted by field evidence. |
| Surface inspection / walkover | Visible landscape features and material on the ground | Low-tech, direct reconnaissance of exposed evidence | Cannot reveal every buried feature; vegetation and surface visibility control results. |
| Aerial photography and remote sensing | Image, radar, infrared or terrain patterns | Shows large-scale traces without excavation | Detection varies with target, season, sensor and environmental conditions. |
| Magnetometry | Small changes in the local magnetic field | Often rapid over open ground; may detect ditches, pits, burning and some wall footings where magnetic contrast exists | Requires a contrast between the feature and surrounding soil; geology, modern metal and background noise can mask signals. |
| Earth resistance | Electrical resistance related to soil moisture and conductivity | Can distinguish moist, infilled ditches from drier walls or foundations | Moisture-sensitive and seasonal. Historic England reports the best general results in spring and autumn, between arid summer conditions and winter waterlogging. |
| Ground-penetrating radar (GPR) | Timing and amplitude of reflected radio-frequency pulses | Can map buried features and estimate depth from reflection timing; may work on some hard surfaces and inside standing buildings | Soil, stones, clay, salts and target properties affect penetration and reflections; design and interpretation require expertise. |
| Sampling or targeted direct investigation | Deposits from systematic samples or selected anomalies | Tests the character of areas where non-invasive methods leave important uncertainty | Disturbs deposits to some degree and must follow a representative research design and applicable permissions. |
Magnetometry
Historic England calls magnetometry the most widely used archaeological geophysical method and one of the quickest for covering ground. Fired materials, ferrous objects, topsoil-filled cuts and some structural remains can create measurable magnetic differences. A quiet magnetic background is helpful, while fences, vehicles, services and highly magnetic geology can complicate processing and interpretation.
Earth resistance
Resistance instruments pass a small electrical current through the ground and compare how strongly different areas resist it. A water-retaining ditch may read differently from a dry stone foundation. Because soil moisture changes through the year, the same location can produce different results in different seasons; the spring and autumn guidance is a practical generalization, not a guarantee for every soil.
Ground-penetrating radar
GPR sends radio-frequency pulses into the ground and records reflected energy. The arrival time can provide an estimate of depth when the survey is calibrated and the material properties are understood. Multiple depth slices may show wall lines, floors, voids or other patterns. Clay-rich or saline ground can attenuate the signal, and clutter from modern surfaces can generate misleading reflections.
6. Interpret anomalies without calling them discoveries
An anomaly is a measured contrast or pattern that differs from its surroundings. It is evidence to interpret, not a confirmed wall, grave, building or road. Archaeologists compare its shape, strength, depth behaviour and distribution with the historical record, surface observations, geology and results from other instruments. A rectangular radar reflection and a magnetic line may reinforce one another, but neither result alone proves a particular feature.
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North Carolina’s Office of State Archaeology cautions that geophysical methods typically cannot fully characterize anomalies without direct archaeological investigation. Remote sensing combined with traditional survey can provide a more robust site-identification approach, while still leaving some interpretations uncertain.
Decide when ground-truthing is justified
Ground-truthing can involve a small test trench, shovel tests, augering, coring or another limited investigation chosen for the question and context. The team targets representative or especially consequential anomalies, documents exactly where and why it sampled, and follows conservation and permitting requirements. Sampling one attractive signal does not validate every similar-looking signal across the site, so the strategy should include controls or additional locations where appropriate.
7. Control locations and document the data
Every observation and anomaly needs a reliable position. North Carolina guidance recommends GPS-referenced datum points with sub-decimeter accuracy for marking geophysical grid corners or boundaries. That is a project specification, not a promise that an ordinary recreational handheld GPS receiver can meet it. Surveyors may use professional GNSS equipment, total stations or a combination, then tie the grid to a recognized coordinate system and record the control method.
Field records should preserve:
- survey boundaries, grid orientation, datum points and coordinate system;
- instrument model, settings, sensor height or traverse spacing and calibration checks;
- date, weather, ground moisture, vegetation, surface condition and obstacles;
- raw files, processed files, software or processing choices and quality-control notes;
- target identifiers, photographs, descriptions, interpretations and confidence levels; and
- decisions about further survey, sampling, excavation or leaving the area untested.
Documenting processing is essential because filtering, interpolation, contrast adjustments and removal of spikes can change how an anomaly looks. Retaining raw data lets a later researcher revisit those choices.
8. Report, archive and use the results to plan excavation
The final report explains the question, methods, coverage, conditions, limitations, results and interpretation. Maps should distinguish measured data from interpreted targets and show unsurveyed or inaccessible areas. The report should identify which conclusions are supported by direct evidence and which remain hypotheses.
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Results are deposited with the appropriate heritage record or archive so future projects do not have to repeat the same work. Suffolk County Council, for example, asks for results to be deposited with its archaeological service. Archiving is not administrative decoration: it preserves the baseline against which later excavation, construction monitoring or conservation decisions can be made.
Survey may lead to several outcomes. Archaeologists may excavate a small, well-chosen area; redesign the trench layout to avoid important deposits; monitor construction; preserve the site without excavation; or conclude that the question cannot be answered with the available evidence. A large excavation is often unnecessary when a combination of documentary, surface and geophysical evidence answers the management or research question adequately.
Common mistakes and how professionals avoid them
- Assuming a clear image equals a feature: compare independent evidence and label interpretations as provisional until tested.
- Treating a negative scan as proof of absence: check method sensitivity, vegetation, depth, geology, interference and inaccessible ground.
- Using a fashionable instrument everywhere: select the sensor for the target and conditions, not for its popularity.
- Skipping archival work: historical maps can reveal destroyed or buried resources that surface inspection cannot.
- Overlooking permissions: verify landowner consent and jurisdiction-specific heritage approvals before fieldwork.
- Failing to preserve raw data: retain original files, control information and processing logs so interpretations remain auditable.
- Reporting only attractive anomalies: describe coverage, blanks, noise and inaccessible areas as well as positive results.
How the sequence changes from site to site
The stages are a framework, not a universal checklist. A historic town may require building research, pavement-compatible GPR and close coordination with utilities. A ploughed field may favor a walkover after cultivation followed by magnetometry. Dense woodland may make aerial imagery and walking difficult but increase the value of lidar and carefully spaced ground observations. Wet ground can improve or degrade particular contrasts depending on the method and season. Protected sites add legal steps, while a small research project may combine desk study, walkover and targeted sampling rather than commission every geophysical technique.
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The governing principle is to match evidence to the decision. Archaeologists ask what must be known, what each method can detect under the actual conditions, how uncertainty will be tested and how the record will remain useful after the field team leaves.
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