High spatiotemporal resolution mapping of global urban change from 1985 to 2015

This dataset includes three parts:<br>(1) The mapped global annual urban dynamics (GAUD) and green recovery from 1985 to 2015 at a 30-m resolution. This part of data is organized by 10-degree grids (totally 224).Shapefiles of 10-degree grids can be found in "grids_world.zip".Urban expansion data is packaged in "urban_grid_i.zip" (i ranges from 0 to 223). Green recovery data is packaged in "green_grid_0-223.zip".Their format is GeoTiff, and for each pixel, values from 1985 to 2015 demonstrate the urbanized or green recovery year, while 0 means no data.<br>(2) The interpreted samples of urban extent in 1985 and 2015, and urbanized year during 1985 and 2015. This part of data is for examining the accuracies of our data fusion and temporal segmentation approach. Interpreted urban extent is packaged in "Ref_tif_clip_1985.rar" and "Ref_tif_clip_2015.rar".Its format is GeoTiff, and for each pixel, value 1 means urban areas, while 0 means non-urban areas.Valid samples of urbanized year can be found in "validation_urbanized_year.xls".<br>(3) A demo of NUACI calculation and urbanized years dectection can be found at link:https://code.earthengine.google.com/1c901129fa8c9d81b292824e8fb4ff1c<br>

本数据集包含三个部分：<br>(1) 分辨率为30米的1985年至2015年全球年度城市动态（Global Annual Urban Dynamics, GAUD）与绿色复苏映射数据。该部分数据以10度网格（共计224个）为单元进行组织。10度网格的形状文件（Shapefiles）可于"grids_world.zip"中获取。城市扩张数据打包为"urban_grid_i.zip"（i取值范围为0至223），绿色复苏数据打包为"green_grid_0-223.zip"，二者格式均为GeoTiff。每个像素的1985至2015年对应数值分别代表该像素被城市化或实现绿色复苏的年份，数值0表示无有效数据。<br>(2) 1985年与2015年的城市范围解译样本，以及1985至2015年间的城市化年份数据。该部分数据用于验证本数据集所采用的数据融合与时间分割方法的精度。解译得到的城市范围数据打包为"Ref_tif_clip_1985.rar"与"Ref_tif_clip_2015.rar"，格式为GeoTiff，其中像素值1代表城市区域，0代表非城市区域。城市化年份的有效验证样本可于"validation_urbanized_year.xls"中获取。<br>(3) NUACI计算与城市化年份检测的演示代码可通过以下链接获取：https://code.earthengine.google.com/1c901129fa8c9d81b292824e8fb4ff1c