An insight into the sensitivity of fully polarimetric SAR data to biomass of pearl millet crop
The development of polarimetric decomposition techniques improves the capability to understand the complex scattering mechanisms occurring in the dryland crops. The present study is focused on assessing the sensitivity of coherent, incoherent, model and Eigen vector-based decomposition techniques fr...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-08-01
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| Series: | Egyptian Journal of Remote Sensing and Space Sciences |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1110982322000229 |
| _version_ | 1828807384037851136 |
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| author | Shanmugapriya Selvaraj Hari Shanker Srivastava Dipanwita Haldar Abhishek Danodia |
| author_facet | Shanmugapriya Selvaraj Hari Shanker Srivastava Dipanwita Haldar Abhishek Danodia |
| author_sort | Shanmugapriya Selvaraj |
| collection | DOAJ |
| description | The development of polarimetric decomposition techniques improves the capability to understand the complex scattering mechanisms occurring in the dryland crops. The present study is focused on assessing the sensitivity of coherent, incoherent, model and Eigen vector-based decomposition techniques from multitemporal Radarsat-2 polarimetric dataset to scattering mechanisms occurring in the critical growth stages of pearl millet crop. Yamaguchi volume component along with its temporal response was observed to be sensitive and reliable due to its dynamic biomass characterization. Overestimation of volume component and earlier saturation of biomass from 4 kgm−2 were observed limitations in Freeman 2 & 3 component decomposition when dealing with higher vegetation crops. The decrease in volume scattering over increasing biomass proved Van Zyl response contrary to the established understanding. Panicle stage was identified as the critical stage for discriminating pearl millet from similar structured maize and sorghum crops. In this stage, alpha angle generated from Cloude-Pottier decomposition almost reached 550 indicating the increase in contribution of dihedral scattering due to vertical prominent panicles in the pearl millet fields. The various Touzi parameters (α1, Ψ1, φ1 and τ1) were observed to have sensitivity towards changes in crop canopy structures, which will require further research to verify. The proposed Δ(F3-Y4) was the most suitable Volume Difference Index (VDI) for characterizing biomass of erectophile crops as the dynamic biomass response was found even beyond 8 kgm−2. |
| first_indexed | 2024-12-12T08:25:01Z |
| format | Article |
| id | doaj.art-85e88857e3c843729f9d843b4091af3e |
| institution | Directory Open Access Journal |
| issn | 1110-9823 |
| language | English |
| last_indexed | 2024-12-12T08:25:01Z |
| publishDate | 2022-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Egyptian Journal of Remote Sensing and Space Sciences |
| spelling | doaj.art-85e88857e3c843729f9d843b4091af3e2022-12-22T00:31:17ZengElsevierEgyptian Journal of Remote Sensing and Space Sciences1110-98232022-08-01252361369An insight into the sensitivity of fully polarimetric SAR data to biomass of pearl millet cropShanmugapriya Selvaraj0Hari Shanker Srivastava1Dipanwita Haldar2Abhishek Danodia3Department for Earth Observation, Institute of Geography, Friedrich Schiller University, Jena, Germany; Corresponding author.Agriculture and Soils Department, Indian Institute of Remote Sensing, Indian Space Research Organisation (ISRO), Dehradun 248001, IndiaAgriculture and Soils Department, Indian Institute of Remote Sensing, Indian Space Research Organisation (ISRO), Dehradun 248001, IndiaAgriculture and Soils Department, Indian Institute of Remote Sensing, Indian Space Research Organisation (ISRO), Dehradun 248001, IndiaThe development of polarimetric decomposition techniques improves the capability to understand the complex scattering mechanisms occurring in the dryland crops. The present study is focused on assessing the sensitivity of coherent, incoherent, model and Eigen vector-based decomposition techniques from multitemporal Radarsat-2 polarimetric dataset to scattering mechanisms occurring in the critical growth stages of pearl millet crop. Yamaguchi volume component along with its temporal response was observed to be sensitive and reliable due to its dynamic biomass characterization. Overestimation of volume component and earlier saturation of biomass from 4 kgm−2 were observed limitations in Freeman 2 & 3 component decomposition when dealing with higher vegetation crops. The decrease in volume scattering over increasing biomass proved Van Zyl response contrary to the established understanding. Panicle stage was identified as the critical stage for discriminating pearl millet from similar structured maize and sorghum crops. In this stage, alpha angle generated from Cloude-Pottier decomposition almost reached 550 indicating the increase in contribution of dihedral scattering due to vertical prominent panicles in the pearl millet fields. The various Touzi parameters (α1, Ψ1, φ1 and τ1) were observed to have sensitivity towards changes in crop canopy structures, which will require further research to verify. The proposed Δ(F3-Y4) was the most suitable Volume Difference Index (VDI) for characterizing biomass of erectophile crops as the dynamic biomass response was found even beyond 8 kgm−2.http://www.sciencedirect.com/science/article/pii/S1110982322000229Polarimetric decompositionsYamaguchi volume componentAlpha angleDihedral scattering and Volume Difference Index (VDI) |
| spellingShingle | Shanmugapriya Selvaraj Hari Shanker Srivastava Dipanwita Haldar Abhishek Danodia An insight into the sensitivity of fully polarimetric SAR data to biomass of pearl millet crop Egyptian Journal of Remote Sensing and Space Sciences Polarimetric decompositions Yamaguchi volume component Alpha angle Dihedral scattering and Volume Difference Index (VDI) |
| title | An insight into the sensitivity of fully polarimetric SAR data to biomass of pearl millet crop |
| title_full | An insight into the sensitivity of fully polarimetric SAR data to biomass of pearl millet crop |
| title_fullStr | An insight into the sensitivity of fully polarimetric SAR data to biomass of pearl millet crop |
| title_full_unstemmed | An insight into the sensitivity of fully polarimetric SAR data to biomass of pearl millet crop |
| title_short | An insight into the sensitivity of fully polarimetric SAR data to biomass of pearl millet crop |
| title_sort | insight into the sensitivity of fully polarimetric sar data to biomass of pearl millet crop |
| topic | Polarimetric decompositions Yamaguchi volume component Alpha angle Dihedral scattering and Volume Difference Index (VDI) |
| url | http://www.sciencedirect.com/science/article/pii/S1110982322000229 |
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