Articles | Volume 14, issue 12
https://doi.org/10.5194/essd-14-5267-2022
https://doi.org/10.5194/essd-14-5267-2022
Data description paper
 | 
30 Nov 2022
Data description paper |  | 30 Nov 2022

A 1 km daily soil moisture dataset over China using in situ measurement and machine learning

Qingliang Li, Gaosong Shi, Wei Shangguan, Vahid Nourani, Jianduo Li, Lu Li, Feini Huang, Ye Zhang, Chunyan Wang, Dagang Wang, Jianxiu Qiu, Xingjie Lu, and Yongjiu Dai

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Cited articles

Albertson, J. D. and Kiely, G.: On the structure of soil moisture time series in the context of land surface models, J. Hydrol., 243, 101–119, https://doi.org/10.1016/S0022-1694(00)00405-4, 2001. 
Balenović, I., Marjanović, H., Vuletić, D., Paladinić, E., and Indir, K.: Quality assessment of high density digital surface model over different land cover classes, Period. Biol., 117, 459–470, https://doi.org/10.18054/pb.2015.117.4.3452, 2016. 
Balsamo, G., Albergel, C., Beljaars, A., Boussetta, S., Brun, E., Cloke, H., Dee, D., Dutra, E., Muñoz-Sabater, J., Pappenberger, F., de Rosnay, P., Stockdale, T., and Vitart, F.: ERA-Interim/Land: a global land surface reanalysis data set, Hydrol. Earth Syst. Sci., 19, 389–407, https://doi.org/10.5194/hess-19-389-2015, 2015. 
Baroni, G., Ortuani, B., Facchi, A., and Gandolfi, C.: The role of vegetation and soil properties on the spatio-temporal variability of the surface soil moisture in a maize-cropped field, J. Hydrol., 489, 148–159, https://doi.org/10.1016/j.jhydrol.2013.03.007, 2013. 
Breiman, L.: Random Forests, Machine Learning, 45, 5–32, https://doi.org/10.1023/A:1010933404324, 2001. 
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Short summary
SMCI1.0 is a 1 km resolution dataset of daily soil moisture over China for 2000–2020 derived through machine learning trained with in situ measurements of 1789 stations, meteorological forcings, and land surface variables. It contains 10 soil layers with 10 cm intervals up to 100 cm deep. Evaluated by in situ data, the error (ubRMSE) ranges from 0.045 to 0.051, and the correlation (R) range is 0.866-0.893. Compared with ERA5-Land, SMAP-L4, and SoMo.ml, SIMI1.0 has higher accuracy and resolution.
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