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Article: Soil moisture content retrieval from Landsat 8 data using ensemble learning

TitleSoil moisture content retrieval from Landsat 8 data using ensemble learning
Authors
KeywordsEnsemble learning
High resolution
ISMN
Landsat
Soil moisture
Issue Date2022
Citation
ISPRS Journal of Photogrammetry and Remote Sensing, 2022, v. 185, p. 32-47 How to Cite?
AbstractAlthough detailed spatial and temporal distribution of soil moisture is crucial for numerous applications, current global soil moisture products generally have low spatial resolutions (25–50 km), which largely limit their application at local scales. In this study, we developed a high-resolution soil moisture retrieval framework based on ensemble learning by integrating Landsat 8 optical and thermal observations with multi-source datasets, including in-situ measurements from 1,154 stations in the International Soil Moisture Network, the Soil Moisture Active Passive (SMAP) soil moisture product, the ERA5-Land reanalysis dataset, and auxiliary datasets (terrain, soil texture, and precipitation). Two widely used ensemble learning models were explored and compared using ten-fold cross-validation. The extreme gradient boosting (XGBoost) model performed slightly better than the random forest (RF) model, with a root mean square error (RMSE) of 0.047 m3/m3 and correlation coefficient (R) of 0.952, respectively. Further validation using data from four independent soil moisture networks demonstrated that the prediction accuracy of the XGBoost model was comparable to the SMAP soil moisture product, but with a much higher spatial resolution. The model was finally used to map soil moisture over the high-altitude Tibetan Plateau, which is especially sensitive to climate change, from May to September of 2015. The comparison between our fine-scale soil moisture map at 30 m resolution and the coarse-scale SMAP soil moisture product (36 km) revealed high spatial consistency. These results suggest that there is potential to generate accurate soil moisture products globally at 30 m spatial resolution from the long-term Landsat archive. This finding has practical implications in scenarios requiring fine-scale soil moisture maps, such as climate change and permafrost modeling, hydrological and land surface modeling, and agriculture monitoring.
Persistent Identifierhttp://hdl.handle.net/10722/316643
ISSN
2023 Impact Factor: 10.6
2023 SCImago Journal Rankings: 3.760
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhang, Yufang-
dc.contributor.authorLiang, Shunlin-
dc.contributor.authorZhu, Zhiliang-
dc.contributor.authorMa, Han-
dc.contributor.authorHe, Tao-
dc.date.accessioned2022-09-14T11:40:56Z-
dc.date.available2022-09-14T11:40:56Z-
dc.date.issued2022-
dc.identifier.citationISPRS Journal of Photogrammetry and Remote Sensing, 2022, v. 185, p. 32-47-
dc.identifier.issn0924-2716-
dc.identifier.urihttp://hdl.handle.net/10722/316643-
dc.description.abstractAlthough detailed spatial and temporal distribution of soil moisture is crucial for numerous applications, current global soil moisture products generally have low spatial resolutions (25–50 km), which largely limit their application at local scales. In this study, we developed a high-resolution soil moisture retrieval framework based on ensemble learning by integrating Landsat 8 optical and thermal observations with multi-source datasets, including in-situ measurements from 1,154 stations in the International Soil Moisture Network, the Soil Moisture Active Passive (SMAP) soil moisture product, the ERA5-Land reanalysis dataset, and auxiliary datasets (terrain, soil texture, and precipitation). Two widely used ensemble learning models were explored and compared using ten-fold cross-validation. The extreme gradient boosting (XGBoost) model performed slightly better than the random forest (RF) model, with a root mean square error (RMSE) of 0.047 m3/m3 and correlation coefficient (R) of 0.952, respectively. Further validation using data from four independent soil moisture networks demonstrated that the prediction accuracy of the XGBoost model was comparable to the SMAP soil moisture product, but with a much higher spatial resolution. The model was finally used to map soil moisture over the high-altitude Tibetan Plateau, which is especially sensitive to climate change, from May to September of 2015. The comparison between our fine-scale soil moisture map at 30 m resolution and the coarse-scale SMAP soil moisture product (36 km) revealed high spatial consistency. These results suggest that there is potential to generate accurate soil moisture products globally at 30 m spatial resolution from the long-term Landsat archive. This finding has practical implications in scenarios requiring fine-scale soil moisture maps, such as climate change and permafrost modeling, hydrological and land surface modeling, and agriculture monitoring.-
dc.languageeng-
dc.relation.ispartofISPRS Journal of Photogrammetry and Remote Sensing-
dc.subjectEnsemble learning-
dc.subjectHigh resolution-
dc.subjectISMN-
dc.subjectLandsat-
dc.subjectSoil moisture-
dc.titleSoil moisture content retrieval from Landsat 8 data using ensemble learning-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.isprsjprs.2022.01.005-
dc.identifier.scopuseid_2-s2.0-85123029399-
dc.identifier.volume185-
dc.identifier.spage32-
dc.identifier.epage47-
dc.identifier.isiWOS:000782581500001-

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