Medium resolution vector polylines of the Antarctic coastline - VERSION 7.11

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 60degS. 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 v7.11 include updates to the coastline of Adelaide Island and surrounding islands, the grounding line of Alexander Island and the surrounding region, and the ice shelf front of the Brunt Ice Shelf. In addition, sourcedate and revdate attributes were updated to a consistent YYYY-MM-DD format. To indicate limited date precision for earlier records, sourceprec and revprec attributes were introduced.
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.

本数据集基于多源测绘与遥感数据构建南极海岸线数据集，包含以下海岸类型：冰岸线(ice coastline)、岩岸线(rock coastline)、接地线(grounding line)、冰架与冰架前缘(ice shelf and front)、冰隆起(ice rumple)以及冰架邻接岩岸(rock against ice shelf)，以地表属性形式提供。数据集覆盖南纬60°以南的全部陆地与冰架，适用于地形测绘与分析工作。本数据集由高分辨率矢量折线经概化处理生成。ADD数据的中分辨率版本适用于比例尺小于1:1,000,000的制图场景，但由于数据源可用性及海岸特征存在差异，部分区域的细节表现会优于其他区域。
v7.11版本的更新内容包括：阿德莱德岛(Adelaide Island)及其周边岛屿的海岸线、亚历山大岛(Alexander Island)接地线及周边区域、布伦特冰架(Brunt Ice Shelf)的冰架前缘。此外，将sourcedate与revdate属性统一更新为YYYY-MM-DD标准格式；为标识早期记录的日期精度限制问题，新增了sourceprec与revprec属性。
本数据集由英国南极调查局(British Antarctic Survey)下属的测绘与地理信息中心及英国极地数据中心(UK Polar Data Centre)代表南极研究科学委员会(Scientific Committee on Antarctic Research)编制、管理并分发。