ESA Soil Moisture Climate Change Initiative (Soil_Moisture_cci): COMBINED product, Version 09.1

The Soil Moisture CCI COMBINED dataset is one of three datasets created as part of the European Space Agency's (ESA) Soil Moisture Essential Climate Variable (ECV) Climate Change Initiative (CCI) project. The COMBINED product has been created by directly merging Level 2 scatterometer ('active' remote sensing) and radiometer ('passive' remote sensing) soil moisture products derived from the AMI-WS, ASCAT, SMMR, SSM/I, TMI, AMSR-E, WindSat, FY-3B, FY-3C, FY3D, AMSR2, SMOS, GPM and SMAP satellite instruments. PASSIVE and ACTIVE products have also been created.

The v09.1 COMBINED product, provided as global daily images in NetCDF-4 classic file format, presents a global coverage of surface soil moisture at a spatial resolution of 0.25 degrees. It is provided in volumetric units [m3 m-3] and covers the period (yyyy-mm-dd) 1978-11-01 to 2023-12-31. For information regarding the theoretical and algorithmic base of the product, please see the Algorithm Theoretical Baseline Document. Additional reference documents and information relating to the dataset can also be found on the CCI Soil Moisture project website.

The data set should be cited using the following references:

1. Gruber, A., Scanlon, T., van der Schalie, R., Wagner, W., and Dorigo, W. (2019). Evolution of the ESA CCI Soil Moisture climate data records and their underlying merging methodology, Earth Syst. Sci. Data, 11, 717–739, https://doi.org/10.5194/essd-11-717-2019

2. Dorigo, W.A., Wagner, W., Albergel, C., Albrecht, F., Balsamo, G., Brocca, L., Chung, D., Ertl, M., Forkel, M., Gruber, A., Haas, E., Hamer, D. P. Hirschi, M., Ikonen, J., De Jeu, R. Kidd, R. Lahoz, W., Liu, Y.Y., Miralles, D., Lecomte, P. (2017). ESA CCI Soil Moisture for improved Earth system understanding: State-of-the art and future directions. In Remote Sensing of Environment, 2017, ISSN 0034-4257, https://doi.org/10.1016/j.rse.2017.07.001

3. Preimesberger, W., Scanlon, T., Su, C. -H., Gruber, A. and Dorigo, W., "Homogenization of Structural Breaks in the Global ESA CCI Soil Moisture Multisatellite Climate Data Record," in IEEE Transactions on Geoscience and Remote Sensing, vol. 59, no. 4, pp. 2845-2862, April 2021, doi: 10.1109/TGRS.2020.3012896.

土壤湿度CCI组合数据集是欧洲空间局（European Space Agency, ESA）土壤湿度基本气候变量（Essential Climate Variable, ECV）气候变化倡议（Climate Change Initiative, CCI）项目所创建的三类数据集之一。该组合产品通过直接融合源自AMI-WS、ASCAT、SMMR、SSM/I、TMI、AMSR-E、WindSat、FY-3B、FY-3C、FY3D、AMSR2、SMOS、GPM及SMAP卫星载荷的二级散射计（主动遥感，active remote sensing）与辐射计（被动遥感，passive remote sensing）土壤湿度产品生成。项目同时产出了被动遥感与主动遥感两类单源产品。
v09.1版本的组合产品以NetCDF-4经典文件格式提供全球逐日影像数据，覆盖全球范围的地表土壤湿度，空间分辨率为0.25度。数据采用体积单位[m³·m⁻³]进行量化，时间跨度为1978年11月1日至2023年12月31日（格式为yyyy-mm-dd）。若需了解该产品的理论基础与算法框架，请参阅《算法理论基准文档（Algorithm Theoretical Baseline Document）》。与本数据集相关的其他参考文档及信息，亦可在CCI土壤湿度项目官网获取。
本数据集的引用格式如下：
1. Gruber A, Scanlon T, van der Schalie R, 等. ESA CCI土壤湿度气候数据记录及其融合方法的演进[J]. 地球系统科学数据（Earth Syst. Sci. Data）, 2019, 11: 717-739. https://doi.org/10.5194/essd-11-717-2019
2. Dorigo W A, Wagner W, Albergel C, 等. 用于提升地球系统认知的ESA CCI土壤湿度数据集：研究现状与未来方向[J]. 环境遥感（Remote Sensing of Environment）, 2017, ISSN 0034-4257. https://doi.org/10.1016/j.rse.2017.07.001
3. Preimesberger W, Scanlon T, Su C-H, Gruber A, Dorigo W. 全球ESA CCI多卫星土壤湿度气候数据记录中结构断点的均质化处理[J]. IEEE地球科学与遥感汇刊（IEEE Transactions on Geoscience and Remote Sensing）, 2021, 59(4): 2845-2862. https://doi.org/10.1109/TGRS.2020.3012896

搜集汇总

背景与挑战

背景概述

该数据集是ESA土壤湿度气候变化倡议项目的一部分，通过合并多种卫星仪器的数据，提供了1978年至2023年全球每日土壤湿度数据，空间分辨率为0.25度，数据格式为NetCDF-4。数据集包含16.5K文件，总大小为22GB，覆盖全球范围，适用于气候研究和环境监测。