Geological and buried manmade features or objects can cause local variations in the earth’s magnetic field which can be measured with a magnetometer. Detailed magnetic survey can be used to effectively define areas of past human activity. It is a quick, cost effective technique and has become the industry standard for archaeological surveys.
Buried Objects
Heated objects have their magnetic properties markedly changed. This is called 'thermoremanent' effects. These effects can be very large and strong such as an igneous dyke, through to a horse shoe nail in the top soil causing a 'ferrous' spike. Features with thermoremanent magnetisation can be easily found with gradiometers so that objects such as brick walls, foundations, steel or clay pipes, hearths, kilns and ferrous artifacts associated with archaeology will stand out from the background magnetic levels.
Cut Features
As well as thermoremanent effects, more subtle changes in magnetisation can be detected. Silting and deliberate infilling of ditches and pits with magnetically enhanced soil creates a relative contrast against the much lower levels of magnetism within the subsoil into which the feature is cut. Material such as subsoil and non-magnetic bedrock used to create former earthworks and walls may be mapped as areas of lower enhancement compared to surrounding soils.
Factors affecting the magnetic survey may include soil type, local geology, previous human activity, disturbance from modern services.
The SUMO cart system
The SUMO cart system utilises multiple magnetic sensors combined with RTK GPS. It features improved resolution with each data point being accurately georeferenced. Such cart system produce improved results when compared to traditional magnetic surveys, including:
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50% Better In-line Resolution
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Greater Positional Accuracy
In the example above a plethora of magnetic responses of definite archaeological interest have been identified. t. Ring ditches; possible square and round barrows; large pits and / or burials; trackways and droveways; plus rectilinear enclosures and former field systems are all visible in the data. The results could indicate Bronze Age, Iron Age, Romano-British and Medieval activity on the site. The geophysical results also show former field boundaries, possible ridge and furrow ploughing, plus complex palaeo-landscape features.
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How accurate is SUMO's underground utility survey and what types of utilities can it locate?Using cutting-edge technologies like electro-magnetics, signal induced threading, and Ground-Penetrating Radar (GPR), our underground utility surveys accurately detect a wide array of buried utilities including metal and plastic pipes, drainage systems, electricity cables, telecoms, and fiber optic cables. The methodology ensures high accuracy without the need for invasive trial holes.
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What is the turnaround time for obtaining results with SUMO's Underground Utility Detection service?SUMO’s service is built for rapid response. Contractors can receive immediate results onsite. Our equipment provides real-time information, and once we leave the site, the detected utilities are visibly marked on the ground surface for quick reference.
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Does SUMO provide detailed mapping of the detected utilities for permanent records or construction purposes?Absolutely, SUMO not only marks the detected utilities on-site but also offers high-quality, color-coded survey drawings. These drawings can include topographic features and a comprehensive record of the utility detection survey, ensuring it meets the client’s needs for future reference or pre-construction design works.
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Topographical and Geophysical surveyIn addition to mapping out utilities, our experience team can accurately survey the land, creating topographical drawings for use. With our state-of-the-art aerial technology, nothing is missed.
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What additional information can be included in the underground utility mapping service provided by SUMO?In addition to topographic features, SUMO’s mapping service can include fixed surface utility features such as inspection chambers, valve boxes, and telegraph poles. It can also incorporate key topographic details like building lines, fence lines, kerb lines, street furniture, street names, building names, and house numbers, facilitating easy site location.
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Does the utility mapping service by SUMO include standard referencing and compatibility with existing survey data?Yes, SUMO ensures the utility mapping references the ordnance survey grid and level datum as standard. Additionally, the drawings can be supplied to a specified grid and level datum and can overlay an existing topographical survey, making it a versatile and adaptable service for various project needs.
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What sets SUMO Services apart from other survey providers?SUMO stands out due to our impeccable level of service with nationwide coverage, state-of-the-art equipment, and our commitment to delivering top-quality, detailed colour-coded survey drawings in both hard and electronic formats.
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How do I request a survey quotation from SUMO Services?Requesting a quotation is easy. Just click on the "Request a Survey Quotation" button on this page, and our team will get in touch with you promptly.
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Can I book a SUMO Survey online?Yes, you can! Simply click on the "Book a SUMO Survey" button on this page, and you can schedule your survey with us at your convenience.
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What type of survey is suitable for my project or site?Our experienced team will work with you to determine the most appropriate survey for your specific needs. Contact us, and we'll assist you in making the right choice.
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Can I obtain both digital and hard copies of survey drawings?Absolutely. We offer the convenience of electronic copies for digital use and hard copies for your records. Just let us know your preference.
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Do you provide custom survey solutions for unique projects?Yes, we understand that every project is unique. Our team is highly adaptable and can tailor our surveying services to meet your specific requirements.
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How do I get in touch with SUMO Services for further questions?For any additional questions or inquiries, feel free to contact us through the contact form, and our dedicated team will assist you promptly.
Survey Methodologies
Detailed Magnetic Survey
Soil Self-Potential
Electrical Resistivity Tomography (ERT)
Soil Thermal-Resistivity Testing
Electromagnetic Ground Conductivity
Electromagnetic Location (EML)
Ground Penetrating Radar (GPR)
Soil Resistivity Testing
Case Studies
We think you may be interested in reading our clients case studies.
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