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        "cruise":"WESSEX_London_Gatewa",
        "cruise_alias":null,
        "restitle":"Geophysical Survey WESSEX_London_Gateway: Thames Estuary (2002, 2007, 2008, 2011)",
        "ship":null,
        "client":"Wessex Archaeology",
        "contractor":"Wessex Archaeology",
        "cruise_area":null,
        "abstract":"These data comprise four phases of geophysical survey carried out in 2002, 2007, 2008 and 2011, covering various areas within the Thames Estuary as part of an overarching archaeological investigation called the London Gateway project (2001-2020) ahead of planned dredging works.\r\n\r\n88635_49575_2002 - Area of sidescan sonar data within the Thames Estuary (shell haven) area. The data were acquired in OSGB36 British National Grid coordinates and covers the area:\r\nTop Left - 570395.312500 E, 183444.953125 N, \r\nTop Right - 604097.250000 E, 183444.953125 N, \r\nBottom Right - 604097.250000 E, 177590.140625 N, \r\nBottom Left - 570395.312500 E, 177590.140625 N.\r\n\r\n88635_61207_2007 - Geophysical survey comprising sidescan sonar data acquired over 13 separate wreck sites. Corresponding MBES data were acquired previously in 2005 and are deposited with the UKHO. SSS data comprise a total of 83 .xtf files with 2 channels. Acquired in WGS84 UTMz31N coordinates. 400 KhZ frequency. Range 50 m. Sensor positions rather than ship positions for each line in metadata. Each wreck location is centred on (UTMz31N):\r\nAmethyst - 364468 E, 5708659 N; \r\nAncient - 325490 E, 5708230 N; \r\nArgus - 359499 E, 5706071 N;\r\nAsh - 360905 E, 5706497 N; \r\nAtherton - 359708 E, 5706186 N;\r\nDynamo - 401449 E, 5743755 N; \r\nEastOaze - 362786 E, 5707385 N;\r\nErnaBoldt - 403551 E, 5746997 N; \r\nLetchworth - 357544 E, 5705592 N; \r\nLondon - 343115 E, 5707365 N; \r\nPottery - 346619 E, 5706276 N;\r\nSS Storm - 406001 E, 5747115 N; \r\nUnknown wreck - 375530 E, 5714052 N.\r\n\r\n88635_61208_2008 - Geophysical survey comprising sidescan sonar and multibeam echosounder data over a single wreck site. SSS data comprise a total of 7 .xtf files with 2 channels. 400 KhZ frequency. Range 50 m. Acquired in WGS84 Geographic coordinates. Sensor positions rather than ship positions for each line in metadata. Wreck location in WGS84 UTMz31N:\r\nAisha - 363982 E, 5707656 N.\r\n\r\n88635_79800_2011 - Geophysical survey comprising magnetometer, sidescan sonar and multibeam echosounder data undertaken over three separate blocks; Area 9to11, Area 26to36 and Area 105.\r\nArea9to11:332980 E, 5708675 N; 332980 E, 5708226 N; 338586 E, 5707813 N; 338681 E, 5708242 N.\r\nArea26to36:339693 E, 5708096 N; 339571 E, 5707680 N; 345670 E, 5706229 N; 350490 E, 5706371 N; 350338 E, 5706838 N; 345680 E, 5706685 N.\r\nArea105:383734 E, 5719704 N; 384035 E, 5719369 N; 385920 E, 5720804 N; 385619 E, 5721134 N.\r\n\r\nWhere corresponding multibeam echosounder data were acquired, these data have been archived with the United Kingdom Hydrographic Office (UKHO).\r\nOverarching full archaeological investigation, including results of the assessment of these data, and technical reports are archived with the Archaeology Data Service (ADS)  (https://doi.org/10.5284/1083494).\r\nAcquired by Port of London Authority (PLA), Wessex Archaeology.\r\nFile formats: CSV, XLS, XTF.",
        "additional_info":"88635_49575 - Sidescan sonar data acquired in 2002 using Isis software by the PLA and Wessex Archaeology. Sidescan operated at 100 KhZ frequency. Range 75 - 100 m, 150 m line spacing, 30 m cable out. The data were acquired in OSGB36 British National Grid coordinates.\r\n\r\n88635_61207 - Sidescan sonar data acquired in 2007 using GeoDAS by the PLA and Wessex Archaeology. Operated at 400 kHz and at a range of 50 m. The data were acquired in WGS84 UTM31N.\r\n\r\n88635_61208\r\nSidescan sonar data acquired in 2008 using a Klein system. operated at 400 KhZ frequency. Range 50 m. Acquired in WGS84 Geographic coordinates. Sensor positions rather than ship positions for each line in metadata.\r\n\r\n88635_79800\r\nMagnetometer data acquired in WGS84 UTM31N using a Geometrics G882 Marine Magnetometer. Sidescan sonar data acquired in WGS84 Lat/Long using a Klein system operated at 900 kHz with range up to 100m",
        "nav_equip_type":"Differential GPS",
        "geophys_equip_type":null,
        "samp_equip_type":null,
        "start_date":"2002-11-14T00:00:00",
        "start_date_est":"Real",
        "end_date":"2011-11-24T00:00:00",
        "end_date_est":"Real",
        "confidentiality":"unclassified (open file)",
        "accessuse_restric":"unrestricted use, copyright acknowledgement",
        "terms_of_use":"Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced Wessex Archaeology materials \"Contains Wessex Archaeology materials \u00a9Wessex Archaeology [year]\"\r\n",
        "terms_of_use_url":"http://nationalarchives.gov.uk/doc/open-government-licence/version/3/",
        "cruise_data_url":null
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