{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,15]],"date-time":"2025-10-15T10:35:36Z","timestamp":1760524536622,"version":"build-2065373602"},"reference-count":63,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2023,9,10]],"date-time":"2023-09-10T00:00:00Z","timestamp":1694304000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Project of the Sichuan Department of Science and Technology","award":["2022NSFSC0216"],"award-info":[{"award-number":["2022NSFSC0216"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Large-area soil moisture (SM) data with high resolution and precision are the foundation for the research and application of hydrological and meteorological models, water resource evaluation, agricultural management, and warning of geological disasters. It is still challenging to downscale SM products in complex terrains that require fine spatial details. In this study, SM data from the Soil Moisture Active and Passive (SMAP) satellite were downscaled from 36 to 1 km in the summer and autumn of 2017 in Sichuan Province, China. Genetic-algorithm-optimized backpropagation (GABP) neural network, random forest, and convolutional neural network were applied. A fusion model between SM and longitude, latitude, elevation, slope, aspect, land-cover type, land surface temperature, normalized difference vegetation index, enhanced vegetation index, evapotranspiration, day sequence, and AM\/PM was established. After downscaling, the in situ information was fused through a geographical analysis combined with a spatial interpolation to improve the quality of the downscaled SM. The comparative results show that in complex terrains, the GABP neural network better captures the soil moisture variations in both time and space domains. The GDA_Kriging method is able to merge in situ information in the downscaled SM while simultaneously maintaining the dynamic range and spatial details.<\/jats:p>","DOI":"10.3390\/rs15184451","type":"journal-article","created":{"date-parts":[[2023,9,11]],"date-time":"2023-09-11T09:09:21Z","timestamp":1694423361000},"page":"4451","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Spatial Downscaling of Soil Moisture Based on Fusion Methods in Complex Terrains"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3244-2247","authenticated-orcid":false,"given":"Qingqing","family":"Chen","sequence":"first","affiliation":[{"name":"College of Atmospheric Sounding, Chengdu University of Information Technology, Chengdu 610225, China"},{"name":"Key Laboratory of Atmosphere Sounding, China Meteorological Administration, Chengdu 610225, China"},{"name":"College of Geophysics, Chengdu University of Technology, Chengdu 610059, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6533-6467","authenticated-orcid":false,"given":"Xiaowen","family":"Tang","sequence":"additional","affiliation":[{"name":"College of Atmospheric Sounding, Chengdu University of Information Technology, Chengdu 610225, China"}]},{"given":"Biao","family":"Li","sequence":"additional","affiliation":[{"name":"Space Star Technology Co., Ltd., Chengdu 610199, China"}]},{"given":"Zhiya","family":"Tang","sequence":"additional","affiliation":[{"name":"College of Atmospheric Sounding, Chengdu University of Information Technology, Chengdu 610225, China"}]},{"given":"Fang","family":"Miao","sequence":"additional","affiliation":[{"name":"College of Geophysics, Chengdu University of Technology, Chengdu 610059, China"}]},{"given":"Guolin","family":"Song","sequence":"additional","affiliation":[{"name":"China Satellite Network System Research Institute Co., Ltd., Beijing 100029, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6878-0934","authenticated-orcid":false,"given":"Ling","family":"Yang","sequence":"additional","affiliation":[{"name":"College of Atmospheric Sounding, Chengdu University of Information Technology, Chengdu 610225, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0090-2840","authenticated-orcid":false,"given":"Hao","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Atmospheric Sounding, Chengdu University of Information Technology, Chengdu 610225, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1123-2790","authenticated-orcid":false,"given":"Qiangyu","family":"Zeng","sequence":"additional","affiliation":[{"name":"College of Atmospheric Sounding, Chengdu University of Information Technology, Chengdu 610225, China"}]}],"member":"1968","published-online":{"date-parts":[[2023,9,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"420","DOI":"10.1029\/96EO00290","article-title":"Why bother for 0.0001% of Earth\u2019s water? 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