Medium resolution vector polylines of the Antarctic coastline

Abstract Coastline for Antarctica created from various mapping and remote sensing sources, consisting of the following coast types: 'ice coastline', 'rock coastline', 'grounding line', 'ice shelf and front', 'ice rumple', and 'rock against ice shelf', provided as a surface attribute. Covering all land and ice shelves south of 60°S. Suitable for topographic mapping and analysis. This dataset has been generalised from the high resolution vector polyline. Medium resolution versions of ADD data are suitable for scales smaller than 1:1,000,000, although certain regions will appear more detailed than others due to variable data availability and coastline characteristics. Changes in v7.12 include updates to the ice shelves around Alexander Island, such as Wilkins, George VI and Bach Ice Shelves; the coastline around Thwaites and Pine Island Glaciers, Bryan Coast and Abbot Ice Shelf, and changes to the coast at Vaughan Inlet. Data compiled, managed and distributed by the Mapping and Geographic Information Centre and the UK Polar Data Centre, British Antarctic Survey on behalf of the Scientific Committee on Antarctic Research. Further information and useful links Map projection: WGS84 Antarctic Polar Stereographic, EPSG 3031. Note: by default, opening this layer in the Map Viewer will display the data in Web Mercator. To display this layer in its native projection use an Antarctic basemap. The currency of this dataset is May 2026 and will be reviewed every 6 months. This feature layer will always reflect the most recent version. For more information on, and access to other Antarctic Digital Database (ADD) datasets, refer to the SCAR ADD data catalogue. A related high resolution dataset is also published via Living Atlas, as well medium and high resolution polygon datasets. For background information on the ADD project, please see the British Antarctic Survey ADD project page. Lineage Dataset compiled from a variety of Antarctic map and satellite image sources. The dataset was created using ArcGIS and QGIS GIS software programmes and has been checked for basic topography and geometry errors, but does not contain strict topology. Quality varies across the dataset, certain areas where high resolution source data were available are suitable for large scale maps, whereas other areas are only suitable for smaller scales. Each line has attributes detailing the source, which can give the user further indications of its suitability for specific uses. Attributes also give information, including surface (e.g. grounding line, ice coastline, ice shelf front) and revision date (revdate), accompanied by revprec - date precision, either day, month, or year. Compiled from sources ranging in time from the 1990s to 2026 - individual lines contain exact source dates in the sourcedate field with the corresponding sourceprec field. This medium resolution version has been generalised from the high resolution version. All areas <0.1km² not intersecting anything else were deleted, and the simplify tool was used in ArcGIS with the retain critical points algorithm and a smoothing tolerance of 50m. Citation Gerrish, L., Ireland, L., Fretwell, P., Cooper, P., & Skachkova, A. (2026). Medium resolution vector polylines of the Antarctic coastline (Version 7.12) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/37ad06ff-888d-452c-be85-018e59600103 If using for a graphic or if short on space, please cite as 'data from the SCAR Antarctic Digital Database, 2026'基于多种制图与遥感数据源构建的南极抽象海岸线数据集，包含以下海岸类型：冰海岸线（ice coastline）、岩石海岸线（rock coastline）、接地线（grounding line）、冰架与冰架前缘（ice shelf and front）、冰丘（ice rumple）以及冰架与岩石交界带（rock against ice shelf），以地表属性字段形式提供。本数据集覆盖南纬60°以南的全部陆地与冰架区域，适用于地形制图与相关分析工作。 本数据集由高分辨率矢量折线经简化概括生成。南极数字数据库（Antarctic Digital Database, ADD）的中分辨率版本适用于1:1000000及更小比例尺的制图工作，但由于数据源可用性与海岸线特征存在区域差异，部分区域的细节表现会优于其他区域。 v7.12版本的更新内容包括：亚历山大岛周边冰架（如威尔金斯冰架、乔治六世冰架与巴赫冰架）、思韦茨冰川与派恩岛冰川周边海岸线、布莱恩海岸与阿博特冰架的相关修订，以及沃恩湾沿岸海岸线的调整。 本数据集由英国南极调查局（British Antarctic Survey, BAS）下属制图与地理信息中心及英国极地数据中心联合编制、管理与分发，服务于南极研究科学委员会（Scientific Committee on Antarctic Research, SCAR）。 更多信息与相关链接如下：地图投影采用WGS84南极极方位立体投影（EPSG 3031）。 注意：默认情况下，在地图查看器中打开该要素图层时，数据将以Web墨卡托投影显示。若需以原生投影显示该图层，请使用南极专属底图。 本数据集的最新更新时间为2026年5月，后续将每6个月进行一次复审。本要素图层将始终呈现最新版本的数据集内容。 如需了解并获取其他南极数字数据库（ADD）数据集，请参阅SCAR ADD数据目录。相关的高分辨率数据集、中分辨率与高分辨率多边形数据集也已通过Living Atlas平台发布。如需了解ADD项目的背景信息，请访问英国南极调查局ADD项目官方页面。 数据谱系：本数据集由多种南极地图与卫星影像数据源编制而成，采用ArcGIS与QGIS两款地理信息系统软件构建，已针对基础地形与几何错误完成检查，但未构建严格拓扑关系。 数据集整体质量存在区域差异：拥有高分辨率源数据的区域可适用于大比例尺制图工作，其余区域仅适用于小比例尺制图。每条折线均包含数据源属性字段，可为用户评估其在特定应用场景下的适用性提供参考依据。属性信息还涵盖地表类型（如接地线、冰海岸线、冰架前缘）、修订日期（revdate），以及对应修订日期的精度字段revprec，精度级别分为日、月或年。 本数据集的源数据时间跨度为1990年至2026年，单条折线的精确源数据日期存储于sourcedate字段，对应精度信息存储于sourceprec字段。本中分辨率版本由高分辨率版本简化概括生成：已删除所有未与其他要素相交且面积小于0.1平方千米的区域，并在ArcGIS中采用保留关键点算法进行几何简化，平滑容差设置为50米。 引用格式：Gerrish, L., Ireland, L., Fretwell, P., Cooper, P., & Skachkova, A. (2026). 南极海岸线中分辨率矢量折线数据集（版本7.12）[数据集]. NERC EDS英国极地数据中心. https://doi.org/10.5285/37ad06ff-888d-452c-be85-018e59600103 若用于制图或空间有限的场景，请引用为"数据来源于SCAR南极数字数据库，2026"