London Gateway Project Geophysics Archive for offshore surveys undertaken in 2002, 2007, 2008 and 2011

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. 88635_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: Top Left - 570395.312500 E, 183444.953125 N, Top Right - 604097.250000 E, 183444.953125 N, Bottom Right - 604097.250000 E, 177590.140625 N, Bottom Left - 570395.312500 E, 177590.140625 N. 88635_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): Amethyst - 364468 E, 5708659 N; Ancient - 325490 E, 5708230 N; Argus - 359499 E, 5706071 N; Ash - 360905 E, 5706497 N; Atherton - 359708 E, 5706186 N; Dynamo - 401449 E, 5743755 N; EastOaze - 362786 E, 5707385 N; ErnaBoldt - 403551 E, 5746997 N; Letchworth - 357544 E, 5705592 N; London - 343115 E, 5707365 N; Pottery - 346619 E, 5706276 N; SS Storm - 406001 E, 5747115 N; Unknown wreck - 375530 E, 5714052 N. 88635_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: Aisha - 363982 E, 5707656 N. 88635_79800_2011 - Geophysical survey comprising magnetometer, sidescan sonar and multibeam echosounder data undertaken over three separate blocks; Area 9to11, Area 26to36 and Area 105. Area9to11:332980 E, 5708675 N; 332980 E, 5708226 N; 338586 E, 5707813 N; 338681 E, 5708242 N. Area26to36:339693 E, 5708096 N; 339571 E, 5707680 N; 345670 E, 5706229 N; 350490 E, 5706371 N; 350338 E, 5706838 N; 345680 E, 5706685 N. Area105:383734 E, 5719704 N; 384035 E, 5719369 N; 385920 E, 5720804 N; 385619 E, 5721134 N. Where corresponding multibeam echosounder data were acquired, these data have been archived with the United Kingdom Hydrographic Office (UKHO). Overarching 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).

本数据集包含了于2002年、2007年、2008年和2011年进行的四次地球物理调查阶段，覆盖了泰晤士河口（壳港）区域，作为伦敦门户项目（2001-2020年）整体考古调查的一部分，该调查旨在为计划中的疏浚工作做准备。数据集包括以下内容：
- 88635_49575_2002：泰晤士河口区域侧扫声纳数据的区域。数据采用OSGB36英国国家网格坐标系统获取，覆盖范围：左上角 - 570395.312500 E，183444.953125 N，右上角 - 604097.250000 E，183444.953125 N，右下角 - 604097.250000 E，177590.140625 N，左下角 - 570395.312500 E，177590.140625 N。
- 88635_61207_2007：地球物理调查，包括在13个不同的沉船遗址获取的侧扫声纳数据。相应的多波束测深系统数据于2005年之前获取，并存放在英国水文办公室（UKHO）。侧扫声纳数据包括共计83个.xtf文件，拥有2个通道。数据在WGS84 UTMz31N坐标系统中获取，频率为400 KhZ，探测范围为50米。元数据中记录的是传感器位置而非船舶位置。每个沉船位置的坐标如下：
- Amethyst - 364468 E，5708659 N；Ancient - 325490 E，5708230 N；Argus - 359499 E，5706071 N；Ash - 360905 E，5706497 N；Atherton - 359708 E，5706186 N；Dynamo - 401449 E，5743755 N；EastOaze - 362786 E，5707385 N；ErnaBoldt - 403551 E，5746997 N；Letchworth - 357544 E，5705592 N；London - 343115 E，5707365 N；Pottery - 346619 E，5706276 N；SS Storm - 406001 E，5747115 N；Unknown wreck - 375530 E，5714052 N。
- 88635_61208_2008：地球物理调查，包括单个沉船遗址的侧扫声纳和多波束测深系统数据。侧扫声纳数据包括共计7个.xtf文件，拥有2个通道。频率为400 KhZ，探测范围为50米。数据在WGS84地理坐标系统中获取。元数据中记录的是传感器位置而非船舶位置。沉船位置坐标为：Aisha - 363982 E，5707656 N。
- 88635_79800_2011：地球物理调查，包括在三个独立的区块（区域9至11、区域26至36和区域105）进行的磁力仪、侧扫声纳和多波束测深系统数据。区域9至11：332980 E，5708675 N；332980 E，5708226 N；338586 E，5707813 N；338681 E，5708242 N。区域26至36：339693 E，5708096 N；339571 E，5707680 N；345670 E，5706229 N；350490 E，5706371 N；350338 E，5706838 N；345680 E，5706685 N。区域105：383734 E，5719704 N；384035 E，5719369 N；385920 E，5720804 N；385619 E，5721134 N。当获取相应的多波束测深系统数据时，这些数据已存档于英国水文办公室（UKHO）。整体考古调查，包括对这些数据的评估结果和技术报告，已存档于考古数据服务（ADS）（https://doi.org/10.5284/1083494）。