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TechnicalNote Rapid Archaeological Acquisition System

Archaeology

TerraDat’s archaeological capability has been recently enhanced through the use of a specialist magnetic gradiometry carrier system. This system utilises eight Foerster FEREX CON 650 gradiometer probes mounted on a towed rig. Real-time, sub-centimetre accurate positioning is provided by a Trimble 5700 RTK GPS. The rig is towed across the survey area behind a 4x4 vehicle or ATV acquiring swaths of data up to 3.5m wide. The probes are spaced 0.5m apart giving twice the resolution of a conventional gradiometry survey. In optimal field conditions, the new system allows acquisition rates of up to 40 hectares per day - significantly reducing survey costs and time over a conventional walked survey. As one of Europe’s leading environmental geophysical contractors, TerraDat’s enhanced processing and interpretation capabilities allow datasets to be further interrogated to provide information on a variety of site hazards such as shallow UXO, mine workings and buried structures and services.

*Cost Effective *Non-invasive *Rapid Ground Coverage *Environmentally Friendly *Swift Mobilisation/Global Coverage

, Up to 40 hectares a day

1007 58.021

58.23 Hedge

60.09

Grass

60.51

60.92

k q

h

m

Hedge Ht=2.2m 57.65 57.64

58.94

57.12

67.28

TH 57.67

Pond

61.17

61.06

Hedge

Ht=2.2m

58.92

57.52

j

59.80

57.74

f 62.77

Grass

62.13

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e

b

1005 62.533

58.71

63.75

Ht=2.0m

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Hedge

62.80

Grass

n

a

61.61

n

n

h

62.95

n

61.09

c

61.49

60.85

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n

65.204

1009

Ht=2.0m

59.48

60.23

p

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The Sensys rig can be towed by a variety of vehicles from ATVs to tractors

, Geophysical and archaeological interpretation by experienced specialists , Twice the resolution of a conventional gradiometry survey , Survey results provided in CAD/GIS formats

Example of finalised data - magnetic gradiometry (left) and interpretive plot (right), data can be suppled in a variety of CAD and GIS formats Contact Simon Hughes for more info; simon@terradat.co.uk

TerraDat (UK) Ltd - Tel (08707 303050) www.terradat.co.uk


Archaeological Geophysics