An Enhanced Saline Soil Dielectric Constant Model Used for Remote Sensing Soil Moisture and Salinity Retrieval
The soil dielectric constant model is essential for retrieving soil properties based on microwave remote sensing. However, the existing saline soil dielectric constant models perform poorly in simulating the dielectric constant of soil with high water content and salinity. In this study, the Wang Yu...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-01-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/16/3/452 |
| _version_ | 1797318248828502016 |
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| author | Liang Gao Xiaoning Song Xiaotao Li Jianwei Ma Pei Leng Weizhen Wang Xinming Zhu |
| author_facet | Liang Gao Xiaoning Song Xiaotao Li Jianwei Ma Pei Leng Weizhen Wang Xinming Zhu |
| author_sort | Liang Gao |
| collection | DOAJ |
| description | The soil dielectric constant model is essential for retrieving soil properties based on microwave remote sensing. However, the existing saline soil dielectric constant models perform poorly in simulating the dielectric constant of soil with high water content and salinity. In this study, the Wang Yueru (WYR) saline soil dielectric constant model, which was demonstrated to perform well in describing the effect of salinity and moisture on the dielectric constant, was validated based on experimental measurements of soil samples under different water content and salinity degrees. Furthermore, we adjusted the model form, refitted the empirical coefficient in the model, and finally acquired a two-stage model for simulating the soil dielectric constant. The enhanced model was validated under different soil moisture and salinity ranges using experimental measurements of soil samples. Compared to the original model, the proposed model exhibits a larger improvement in simulating the soil dielectric constant, and the RMSE of the simulated results dramatically decreased from 7.3 to 1.6, especially for soil with high salinity and water content. On this basis, a model suitable for L-band microwave was established. This model is of great significance for studying soil dielectric characteristics and retrieving soil parameters based on L-band data. Furthermore, this model can be used to retrieve soil salinity and water content using microwave remote sensing under a broadened application situation, such as in saline-alkali soils, wetlands, and salt marshes. |
| first_indexed | 2024-03-08T03:49:40Z |
| format | Article |
| id | doaj.art-469ab8c67d8d476292171bae6346091a |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-08T03:49:40Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-469ab8c67d8d476292171bae6346091a2024-02-09T15:21:09ZengMDPI AGRemote Sensing2072-42922024-01-0116345210.3390/rs16030452An Enhanced Saline Soil Dielectric Constant Model Used for Remote Sensing Soil Moisture and Salinity RetrievalLiang Gao0Xiaoning Song1Xiaotao Li2Jianwei Ma3Pei Leng4Weizhen Wang5Xinming Zhu6College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, ChinaCollege of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, ChinaChina Institute of Water Resources and Hydropower Research, Beijing 100038, ChinaChina Institute of Water Resources and Hydropower Research, Beijing 100038, ChinaKey Laboratory of Agricultural Remote Sensing, Ministry of Agriculture and Rural Affairs, Beijing 100081, ChinaNorthwest Institute of Eco-Environment and Resources, Lanzhou 730000, ChinaCollege of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, ChinaThe soil dielectric constant model is essential for retrieving soil properties based on microwave remote sensing. However, the existing saline soil dielectric constant models perform poorly in simulating the dielectric constant of soil with high water content and salinity. In this study, the Wang Yueru (WYR) saline soil dielectric constant model, which was demonstrated to perform well in describing the effect of salinity and moisture on the dielectric constant, was validated based on experimental measurements of soil samples under different water content and salinity degrees. Furthermore, we adjusted the model form, refitted the empirical coefficient in the model, and finally acquired a two-stage model for simulating the soil dielectric constant. The enhanced model was validated under different soil moisture and salinity ranges using experimental measurements of soil samples. Compared to the original model, the proposed model exhibits a larger improvement in simulating the soil dielectric constant, and the RMSE of the simulated results dramatically decreased from 7.3 to 1.6, especially for soil with high salinity and water content. On this basis, a model suitable for L-band microwave was established. This model is of great significance for studying soil dielectric characteristics and retrieving soil parameters based on L-band data. Furthermore, this model can be used to retrieve soil salinity and water content using microwave remote sensing under a broadened application situation, such as in saline-alkali soils, wetlands, and salt marshes.https://www.mdpi.com/2072-4292/16/3/452saline soilsoil moisturesalinitydielectric constanthigh salinity and water content |
| spellingShingle | Liang Gao Xiaoning Song Xiaotao Li Jianwei Ma Pei Leng Weizhen Wang Xinming Zhu An Enhanced Saline Soil Dielectric Constant Model Used for Remote Sensing Soil Moisture and Salinity Retrieval Remote Sensing saline soil soil moisture salinity dielectric constant high salinity and water content |
| title | An Enhanced Saline Soil Dielectric Constant Model Used for Remote Sensing Soil Moisture and Salinity Retrieval |
| title_full | An Enhanced Saline Soil Dielectric Constant Model Used for Remote Sensing Soil Moisture and Salinity Retrieval |
| title_fullStr | An Enhanced Saline Soil Dielectric Constant Model Used for Remote Sensing Soil Moisture and Salinity Retrieval |
| title_full_unstemmed | An Enhanced Saline Soil Dielectric Constant Model Used for Remote Sensing Soil Moisture and Salinity Retrieval |
| title_short | An Enhanced Saline Soil Dielectric Constant Model Used for Remote Sensing Soil Moisture and Salinity Retrieval |
| title_sort | enhanced saline soil dielectric constant model used for remote sensing soil moisture and salinity retrieval |
| topic | saline soil soil moisture salinity dielectric constant high salinity and water content |
| url | https://www.mdpi.com/2072-4292/16/3/452 |
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