粤港澳、东京湾和旧金山湾海岸线四十年(1980–2020)变化数据集的研发

Coastline Datasets Cover the Guangdong-Hong Kong-Macao,Tokyo and San Francisco Bays(1980–2020)

湾区是河口海岸蓝图重绘的重点区域。基于遥感和GIS技术,使用粤港澳湾区、东京湾和旧金山湾1980–2020年7个时期的Landsat系列遥感影像,并参考Google Earth高分辨率影像,进行湾区海岸线的位置提取和类型划分研究。海岸线采用平均大潮高潮线定义,分为自然岸线和人工岸线2大类,7小类。通过相关公式,计算得到不同年份岸线长度变化强度、类型结构变化和利用程度指数等数据,共同构成粤港澳、东京湾和旧金山湾海岸线及其类型时空变化数据集(1980–2020)。数据结果表明,2020年各湾区海岸线总长分别为2,243.17,580.68和689.11km。1980–2020年,粤港澳湾区、东京湾和旧金山湾的海岸线年均长度变化强度分别为0.22%、0.37%和0.09%。2020年人工岸线占比分别为57.62%、95.87%和55.36%,海岸线利用程度指数分别为55.20%,83.22%和57.70%。该数据集内容包括1980–2020年三大湾区的以下数据:(1)1980、1990、2000、2005、2010、2015、2020共7个时期的海岸线及其类型空间分布数据(.shp和.kmz);(2)海岸线的类型结构数据(.xlsx);(3)海岸线长度变化强度(.xlsx);(4)海岸线利用程度指数(.xlsx)。数据集存储为.shp,.kmz和.xlsx格式,由192个数据文件组成,数据量为146 MB(压缩为3个文件,69 MB)。

The coastline datasets of the Guangdong-Hong Kong-Macao,Tokyo,and San Francisco Bays were developed using Landsat remote sensing images from 1980 to 2020,and high-resolution Google Earth images.The coastlines were defined by the mean high-water line,and were divided into two categories,natural and artificial,and seven sub-categories.Furthermore,the intensity of coastline length change,type structure change,and utilization index were calculated.Subsequently,the total coastline lengths of the Guangdong-Hong Kong-Macao Bay Area,Tokyo Bay,and San Francisco Bay in 2020 were 2,243.17,580.68,and 689.11 km,respectively,while the average annual change intensities of the coastline length from 1980 to 2020 were 0.22%,0.37%,and 0.09%,respectively;furthermore,the proportion of artificial coastlines in 2020 were 57.62%,95.87%,and 55.36%,respectively,while the coastline utilization indexes were 55.20%,83.22%,and 57.70%,respectively.The datasets included data of the three Bay Areas for the following:(1)spatial distribution of coastlines and their types(.shp,.kmz),(2)coastline type structure(.xlsx),(3)coastline length change intensity(.xlsx),and(4)coastline utilization index(.xlsx).The datasets were archived in the.shp,.kmz and.xlsx format,and consisted of 192 data files with a size of 146 MB(compressed to 69 MB in three data files).