Known mapped areas of seagrass (Zostera marina & Zostera noltii) meadows around the United Kingdom – 1998 to 2021

Since 1998, approximately 148,134,806 m2 (14,813.5 Ha) of seagrass habitat has been mapped across the United Kingdom coastline. This was calculated from a total of 1,872 polygons from 67 datasets of mapped seagrass meadows using various methodologies of surveying (diving, aerial photography, hydrographic surveys, walking surveys, drone mapping, in situ assessments) and various resolutions. This data was collated from a wide range of databases outlined in the paper by Green et al. (2021; doi:10.3389/fpls.2021.629962). The datasets were subsequently projected into QGIS, merged, and dissolved into one layer as one single shapefile. The resulting dataset is a composite shapefile depicting mapped seagrass distribution across the United Kingdom, saved as a QGIS polygon shapefile, using the Assigned Coordinate Reference System (CRS) EPSG:4326 – WGS 84.自1998年以来，研究人员已完成英国沿岸海域共计约148,134,806平方米（合14,813.5公顷）海草栖息地的测绘工作。该面积统计基于67份海草草甸测绘数据集的总计1,872个多边形要素完成，计算过程采用了潜水测绘、航空摄影、水文测量、实地徒步调查、无人机测绘以及原位评估等多种调研方法，且涵盖不同空间分辨率。本数据集整合自Green等人2021年发表的论文（DOI: 10.3389/fpls.2021.629962）中提及的多类数据库资源。随后，所有原始数据集均在QGIS软件中完成投影、合并与融合处理，最终整合为单个图层的单份形状文件（shapefile）。最终生成的复合形状文件完整呈现了英国沿岸已测绘的海草分布情况，以QGIS多边形形状文件格式存储，采用指定的坐标参考系统（Coordinate Reference System, CRS）EPSG:4326——WGS 84。