Global Monthly and Seasonal Urban and Land Backscatter Time Series, 1993-2020

The Global Monthly and Seasonal Urban and Land Backscatter Time Series, 1993-2020, is a multi-sensor, multi-decadal, data set of global microwave backscatter, for 1993 to 2020. It assembles data from C-band sensors onboard the European Remote Sensing Satellites (ERS-1 and ERS-2) covering 1993-2000, Advanced Scatterometer (ASCAT) onboard EUMETSAT satellites for 2007-2020, and the Ku-band sensor onboard the QuikSCAT satellite for 1999-2009, onto a common spatial grid (0.05 degree latitude /longitude resolution) and time step (both monthly and seasonal). Data are provided for all land (except high latitudes and islands), and for urban grid cells, based on a specific masking that removes grid cells with > 50% open water or < 20% built land. The all-land data allows users to choose and evaluate other urban masks. There is an offset between C-band and Ku-band backscatter from both vegetated and urban surfaces that is not spatially constant. There is a strong linear correlation (overall R-squared value = 0.69) between 2015 ASCAT urban backscatter and a continental-scale gridded product of building volume, across 8,450 urban grid cells (0.05 degree resolution) from large cities in Europe, China, and the United States.

全球月度及季节性城市与土地后向散射时间序列数据集（1993-2020年），集成了多传感器、多十年全球微波后向散射数据。该数据集汇集了1993-2000年间欧洲遥感卫星（ERS-1和ERS-2）上的C波段传感器数据，2007-2020年间欧洲中期天气预报卫星（EUMETSAT）上的高级散射计（ASCAT）数据，以及1999-2009年间QuickSCAT卫星上的Ku波段传感器数据，并将其整合到一个统一的时空网格（0.05度经纬度分辨率）和时步（月度和季节度）。数据涵盖了除高纬度和岛屿之外的所有陆地，以及基于特定掩膜的城市网格单元，该掩膜去除了超过50%开阔水域或低于20%建成土地的网格单元。全陆地数据允许用户选择并评估其他城市掩膜。植被和城市地表的C波段和Ku波段后向散射之间存在非空间恒定的偏移。2015年ASCAT城市后向散射与欧洲、中国和美国大型城市8,450个城市网格单元（0.05度分辨率）的陆地表面积大陆尺度网格产品之间存在强烈的线性相关性（整体R平方值=0.69）。