ESA Soil Moisture Climate Change Initiative (Soil_Moisture_cci): COMBINED product, Version 06.1

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 product has been created by directly merging Level 2 scatterometer and radiometer soil moisture products derived from the AMI-WS, ASCAT, SMMR, SSM/I, TMI, AMSR-E, WindSat, AMSR2, SMOS, SMAP, FY-3B and GPM satellite instruments. PASSIVE and ACTIVE products have also been created.The v06.1 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 2020-12-31. 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-11-717-20192. 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

土壤湿度C3I综合数据集是欧洲空间局（ESA）土壤湿度基本气候变量（ECV）气候变化倡议（CCI）项目所创建的三个数据集之一。该产品通过直接融合由AMl-WS、ASCAT、SMMR、SSM/I、TMI、AMSR-E、WindSat、AMSR2、SMOS、SMAP、FY-3B和GPM卫星仪器获取的二级散射计和辐射计土壤湿度产品而制成。同时，也生成了被动和主动产品。v06.1综合产品以NetCDF-4经典文件格式提供全球每日图像，覆盖范围为全球地表土壤湿度，空间分辨率为0.25度。数据以体积单位[m3 m-3]提供，覆盖时间范围为（yyyy-mm-dd）1978-11-01至2020-12-31。关于产品的理论及算法基础，请参阅算法理论基准文档。与该数据集相关的附加参考文档和信息也可在C3I土壤湿度项目网站上找到。在引用该数据集时，请使用以下参考文献：1. Gruber, A., Scanlon, T., van der Schalie, R., Wagner, W., and Dorigo, W. (2019). 欧洲空间局C3I土壤湿度气候数据记录的演变及其基础融合方法，地球系统科学数据，11，717-739，https://doi.org/10.5194/essd-11-717-20192. 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). 欧洲空间局C3I土壤湿度：提升地球系统理解之现状与未来方向。载于《遥感环境》，2017年，ISSN 0034-4257，https://doi.org/10.1016/j.rse.2017.07.001