URL: http://dartportal.leeds.ac.uk/dart_public/dart_geophysics_cmdminiexplorer/dart_cmd_hhcc_20120425_20120927_pro.zip

Electromagnetic Induction geophysics data collected as part of the DART time-lapse study. Data was collected over a fieldwork season from April 2012 to September 2012. The surveys were conducted using a GF Instruments Electromagnetic Induction CMD MiniExlorer which collected both In-phase and Quadrature data in Horizontal Coplanar (HCP) and Vertical Coplanar (VCP) configurations, at 5 depth levels. The survey was undertaken at a traverse seperation of 0.5m and a timed trigger rate of 0.2 seconds over a 10m survey grid.

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Last updated Nov 19, 2013
Created Nov 19, 2013
Format application/zip
License Open Data Commons Attribution License
can be previewed1
createdNovember 19, 2013
datastore active1
instrumentGF Instruments CMD MiniExplorer
instrument.calibrationDetailsInstrument calibrated by manufacturer (GF Instruments) in 2012
instrument.geophysics.areaSurveyed10m x 10m
instrument.geophysics.dataGridSize10m x 10m
instrument.geophysics.directionOfFirstTraversHHCC = NW, HHQF = NE, DDPF = NW, DDCF = SE
instrument.geophysics.lowFrequencyElectromagneticSurvey.coilConfigurationHorizontal Coplanar (HCP) and Vertical Coplanar (VCP) configurations
instrument.geophysics.lowFrequencyElectromagneticSurvey.depthComponentMulti-depth effective range of 0.5m, 0.25m, 0.9m, 1m and 1.8m
instrument.geophysics.lowFrequencyElectromagneticSurvey.recordedComponentIn-phase (ppt) and Quadrature (converted into conductivity mS/m)
instrument.geophysics.positionOfFirstTraverseHHCC = SE corner, HHQF = SW corner, DDPF = SE corner, DDCF = NW corner
instrument.geophysics.sampleInterval0.2 seconds
instrument.geophysics.surveyTypeGridded area survey
instrument.headerMetadataGridX, Grid Y, Inphase_ppt, (or) Conductivity_mS/m
instrument.measurementDomainAndUnitsIn-Phase (ppt) and Quadrature (mS/m)
last modifiedNovember 19, 2013
license idodc-by
on same domain1
resource group id0ad14165-73bc-4aa5-a79d-dfb006935104
resource.abstractElectromagnetic Induction geophysics data collected as part of the DART time-lapse study. Data was collected over a fieldwork season from April 2012 to September 2012. The surveys were conducted using a GF Instruments Electromagnetic Induction CMD MiniExlorer which collected both In-phase and Quadrature data in Horizontal Coplanar (HCP) and Vertical Coplanar (VCP) configurations, at 5 depth levels. The survey was undertaken at a traverse seperation of 0.5m and a timed trigger rate of 0.2 seconds over a 10m survey grid.
resource.bibliographicCitation@data{dart_cmd_hhcc_20120425_20120927_pro.zip, doi = {not allocated}, url = {http://dartportal.leeds.ac.uk/dart_public/dart_geophysics_cmdminiexplorer/dart_cmd_hhcc_20120425_20120927_pro.zip}, author = "{Robert Fry}", publisher = {DART repository, School of Computing, University of Leeds}, title = {dart_cmd_hhcc_20120425_20120927_pro.zip}, year = {2013}, note = {DART is a Science and Heritage project funded by AHRC and EPSRC. Further DART data and details can be found at http://dartportal.leeds.ac.uk} }
resource.consistencyConsistent data structure, attribution and relationships.
resource.creator.nameRobert Fry
resource.custodian.nameAnthony Beck
resource.descriptionElectromagnetic Induction (EMI) data collected from geophysical survey at the DART geophysical survey areas (Cherry Copse and Quarry Field at Cirencester - Diddington Clay and Diddington Pasture at Diddington) over the DART fieldwork season from April 2012 to September 2012. The survey was conducted using a GF Instruments CMD MiniExplorer at both Horizontal Coplanar (HCP) and Vertical Coplanar (VCP) configurations. Surveys at each of these configurations yields data from 3 different depths, based on manufacturer sensitivity plots. For the HCP configuration depths of 0.5m, 1m and 1.8m are possible. At a VCP configuration, depths of 0.25m, 0.5m and 0.9m are possible. The survey was undertaken using a traverse interval of 0.5m over a 10m grid. Measurement intervals were controlled under a timed collection system every 0.2 seconds. Markers were logged every 1m along the traverse to ensure accuracy of measurements. The survey is part of a monthly collection programme of data collection over 2011-2012. EMI Meter: GF Instruments CMD Mini Explorer: These instruments measure the in-phase and quadrature signal produced by induction of an electromagnetic field into the earth. The in-phase and quadrature response can be equated to apparent magnetic susceptibility and apparent conductivity of the earth. This can therefore be a useful technique in discriminating both magnetic and resistivity values in a single survey. The application of this instrument for archaeological applications is presented in: Bonsall, J., Fry, R., Gaffney, C., Armit, I., Beck, A., Gaffney, V. Forthcoming (2013). Assessment of Multi-Depth Prospection Capabilities using a new Low Frequency Electromagnetic Device. Archaeological Prospection. Further information from the manufacturer on the instrument can be found at http://www.gfinstruments.cz/index.php?menu=gi&smenu=iem&cont=cmd_&ear=ov All of the data are stored on an integrated data logger for subsequent post-processing and analysis. The instrument is connected to a computer via a USB cable and downloaded as text files. The surveys consist of 10m x 10m grids, and for this survey, measurements from the sensor/probes were logged at timed intervals of 0.2 seconds along traverses spaced 0.5m apart. Filenames are arranged first by project (DART), then by instrument (CMDMiniExplorer), then by field (one of HHCC, HHQF, DDPF, DDCF), then by date (YYYYMMDD), then by stage (RAW or PRO), then by sensor configuration (HCP or VCP), then by type of data collected (I = In-phase, Q = Quadrature data), then by depth level (A - C from shallowest to deepest levels - depths dependant on HCP or VCP configuration). Electromagnetic Induction data, X,Y,M values (M values indicating measurements of either In-phase (ppt) or quadrature response (mS/m) RAW = unprocessed (straight from sensor data).
resource.distribution.techniqueDownload only
resource.funderScience and Heritage Programme, Arts and Humanities Research Council, Engineering and Physical Sciences Research Council
resource.instructionalMethodNone - this resource is not part of an education pack. Look at the education pack collection.
resource.keywordsGeophysics, Archaeology, Monitoring, EMI, Quadtrature, In phase, Remote Sensing, Mini Explorer
resource.lineageNone: this is raw data
resource.metadata.creator.nameRobert Fry
resource.processingStepsThe EMI data collected was first separated into datasets relating to depth, and then interpolated via a natural neighbour transformation in Golden Software's Surfer program where the data could be sampled at 0.5m x 0.5m intervals, matching the earth resistance resolution. From this, the data was imported into Geoscan Geoplot 3 software for minimal processing. Data were de-staggered (de-stepped) as necessary and exported as a .CSV file.
resource.publisherSchool of Computing, University of Leeds
resource.purposemulti-temporal heritage detection
resource.reuseConstraintsNo conditions apply for reuse (remix it, publish it, share it, commercialise it, sell it etc.) except attribution (see resource.bibliographicCitation)
resource.reusePotentialarchaeology, environment, heritage, soil science, farming, ecology, geography, earth science
resource.samplingStrategyElectromagnetic Induction survey across a known archaeologcal feature (a ditch) was undertaken across a 10m x 10m survey grid. Survey data is collected once a month over the 15 month survey peroid at a spatial resolution of 0.5m.
resource.topicgeoscientificInformation, environment, heritage, farming, climatology/Meteorology/Atmosphere, imageryBaseMapsEarthCover, society, structure
resource.typeDataset collection
resource.updateFrequencynot planned
revision id674d3529-38a1-4722-9458-ae71fca0359f
revision timestampNovember 19, 2013
size244.8 KiB
spatial{ "type": "Polygon", "coordinates": [ [ [-1.890635, 51.7073],[-1.881537, 51.7073], [-1.881537, 51.70238], [-1.890635, 51.70238], [-1.890635, 51.7073] ] ] }
spatial-textUnited Kingdom
spatial.driftGeologyClay: no superficial drift geology
spatial.polygon.OSGB36{ "type": "Polygon", "coordinates": [ [ [407655, 200958],[408282, 200958], [408282, 200410], [407655, 200410], [407655, 200958] ] ] }
spatial.polygon.WGS84{ "type": "Polygon", "coordinates": [ [ [-1.890635, 51.7073],[-1.881537, 51.7073], [-1.881537, 51.70238], [-1.890635, 51.70238], [-1.890635, 51.7073] ] ] }
title.patternWhere appropriate each resource has been named with the following pattern: DART_<3 character sensor/collection name>_<spatial location>_<StartDateTime YYYYMMDD with optional HHMM>_<endDateTime YYYYMMDD with optional HHMM>_<stage PRO or RAW to refer to processed or raw data>_<other stuff>.<suffix>. Hence, the file DART_T3P_DDCF_20110823_20130106_PRO.csv refers to DART data collected using the T3P Imko soil moisture probes at Diddington Clay Field between 23rd August 2011 and 6th January 2013 which has been processed and is available in a comma separated text format.
webstore last updatedNovember 19, 2013
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