Soil Moisture Change Detection with Sentinel-1 SAR Image for Slow Onsetting Disasters: An Investigative Study Using Index Based Method
Understanding physical processes in nature, including the occurrence of slow-onset natural disasters such as droughts and landslides, requires knowledge of the change in soil moisture between two points in time. The study was conducted on a relatively bare soil, and the change in soil moisture was e...
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| Format: | Article |
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MDPI AG
2023-02-01
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| Series: | Land |
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| Online Access: | https://www.mdpi.com/2073-445X/12/2/506 |
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| author | Arnob Bormudoi Masahiko Nagai Vaibhav Katiyar Dorj Ichikawa Tsuyoshi Eguchi |
| author_facet | Arnob Bormudoi Masahiko Nagai Vaibhav Katiyar Dorj Ichikawa Tsuyoshi Eguchi |
| author_sort | Arnob Bormudoi |
| collection | DOAJ |
| description | Understanding physical processes in nature, including the occurrence of slow-onset natural disasters such as droughts and landslides, requires knowledge of the change in soil moisture between two points in time. The study was conducted on a relatively bare soil, and the change in soil moisture was examined with an index called Normalized radar Backscatter soil Moisture Index (NBMI) using Sentinel-1 satellite data. Along with soil moisture measured with a probe on the ground, a study of correlation with satellite imagery was conducted using a Multiple Linear Regression (MLR) model. Furthermore, the Dubois model was used to predict soil moisture. Results have shown that NBMI on a logarithmic scale provides a good representation of soil moisture change with R<sup>2</sup>~86%. The MLR model showed a positive correlation of soil moisture with the co-polarized backscatter coefficient, but an opposite correlation with the surface roughness and angle of incidence. The results of the Dubois model showed poor correlation of 44.37% and higher RMSE error of 17.1, demonstrating the need for detailed and accurate measurement of surface roughness as a prerequisite for simulating the model. Of the three approaches, index-based measurement has been shown to be the most rapid for understanding soil moisture change and has the potential to be used for understanding some mechanisms of natural disasters under similar soil conditions. |
| first_indexed | 2024-03-11T08:33:43Z |
| format | Article |
| id | doaj.art-8d1874890900450ab8406d4ef593dec0 |
| institution | Directory Open Access Journal |
| issn | 2073-445X |
| language | English |
| last_indexed | 2024-03-11T08:33:43Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Land |
| spelling | doaj.art-8d1874890900450ab8406d4ef593dec02023-11-16T21:38:15ZengMDPI AGLand2073-445X2023-02-0112250610.3390/land12020506Soil Moisture Change Detection with Sentinel-1 SAR Image for Slow Onsetting Disasters: An Investigative Study Using Index Based MethodArnob Bormudoi0Masahiko Nagai1Vaibhav Katiyar2Dorj Ichikawa3Tsuyoshi Eguchi4Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1, Ube 755-8611, JapanGraduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1, Ube 755-8611, JapanGraduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1, Ube 755-8611, JapanGraduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1, Ube 755-8611, JapanGraduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1, Ube 755-8611, JapanUnderstanding physical processes in nature, including the occurrence of slow-onset natural disasters such as droughts and landslides, requires knowledge of the change in soil moisture between two points in time. The study was conducted on a relatively bare soil, and the change in soil moisture was examined with an index called Normalized radar Backscatter soil Moisture Index (NBMI) using Sentinel-1 satellite data. Along with soil moisture measured with a probe on the ground, a study of correlation with satellite imagery was conducted using a Multiple Linear Regression (MLR) model. Furthermore, the Dubois model was used to predict soil moisture. Results have shown that NBMI on a logarithmic scale provides a good representation of soil moisture change with R<sup>2</sup>~86%. The MLR model showed a positive correlation of soil moisture with the co-polarized backscatter coefficient, but an opposite correlation with the surface roughness and angle of incidence. The results of the Dubois model showed poor correlation of 44.37% and higher RMSE error of 17.1, demonstrating the need for detailed and accurate measurement of surface roughness as a prerequisite for simulating the model. Of the three approaches, index-based measurement has been shown to be the most rapid for understanding soil moisture change and has the potential to be used for understanding some mechanisms of natural disasters under similar soil conditions.https://www.mdpi.com/2073-445X/12/2/506Sentinel-1soil moistureNBMIdisaster mitigation |
| spellingShingle | Arnob Bormudoi Masahiko Nagai Vaibhav Katiyar Dorj Ichikawa Tsuyoshi Eguchi Soil Moisture Change Detection with Sentinel-1 SAR Image for Slow Onsetting Disasters: An Investigative Study Using Index Based Method Land Sentinel-1 soil moisture NBMI disaster mitigation |
| title | Soil Moisture Change Detection with Sentinel-1 SAR Image for Slow Onsetting Disasters: An Investigative Study Using Index Based Method |
| title_full | Soil Moisture Change Detection with Sentinel-1 SAR Image for Slow Onsetting Disasters: An Investigative Study Using Index Based Method |
| title_fullStr | Soil Moisture Change Detection with Sentinel-1 SAR Image for Slow Onsetting Disasters: An Investigative Study Using Index Based Method |
| title_full_unstemmed | Soil Moisture Change Detection with Sentinel-1 SAR Image for Slow Onsetting Disasters: An Investigative Study Using Index Based Method |
| title_short | Soil Moisture Change Detection with Sentinel-1 SAR Image for Slow Onsetting Disasters: An Investigative Study Using Index Based Method |
| title_sort | soil moisture change detection with sentinel 1 sar image for slow onsetting disasters an investigative study using index based method |
| topic | Sentinel-1 soil moisture NBMI disaster mitigation |
| url | https://www.mdpi.com/2073-445X/12/2/506 |
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