Abstract
Rice is one of the most important food crop in India covering about one-fourth of the total cropped area. India is the second largest producer and consumer of rice and accounts for 21% of the world’s total rice production. Rice is fundamentally a kharif season crop and grown in mainly rainfed areas. Recently there is a considerable increase in production, area and yield of rice crop in India. Temporal monitoring of crop area under cultivation is essential for the sustainable management of agricultural activities on both national and global levels. The present study is envisaged to estimate area under kharif rice using multi-temporal Sentinel-1 Synthetic Aperture Radar (SAR) data with dual polarization (VH and VV) in Bhandara district of Maharashtra. The geographical area of Bhandara district is 4087 square kilometres and lies in between 20°64′03′' to 21°60′18′' N latitude and 79°44′93′' to 80°08′70′' E longitude. The rice area is extracted using Random Forest (RF) classification techniques available in SNAP tool and validated using the ground observation collected from the field. An area of 1760 square kilometres was found under kharif rice out of 4087 square kilometres area of entire Bhandara district. The rice is predominant crop and covered around 43% of the total geographical area of Bhandara district during kharif season. The user accuracy (omission error), producer accuracy (commission error) for rice crop, overall accuracy and Kappa coefficients were 82.7, 90.0, 91% and 0.80, respectively. The study found that SAR data can be successfully used for acreage estimation with RF classifier.
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Acknowledgement
Authors extend their sincere gratitude to Regional Remote Sensing Centre-Central, National Remote Sensing Centre (NRSC), Indian Space Research Organisation (ISRO) and Jawaharlal Nehru Technological University Kakinada for providing opportunity and facility to conduct the study. The technical support provided by RRSC-Central staff is duly acknowledged. We are also thankful to Sentinel Copernicus Science Hub maintained by the European Space Agency (ESA) for online accessibility of Sentinel-1 SAR data. Authors are also thankful to the anonymous reviewers.
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Nandepu.V. V. S. S. Teja Subbarao, Jugal Kishore Mani and A. O. Varghese formulated and designed this research. Nandepu.V. V. S. S. Teja Subbarao, Jugal Kishore Mani and Ashish Shrivastava carried out the data processing and analysis. Nandepu.V. V. S. S. Teja Subbarao and K. Srinivas wrote the paper. A. O. Varghese provided suggestions and modified the paper. Nandepu.V. V. S. S. Teja Subbarao, Jugal Kishore Mani and A. O. Varghese revised the manuscript draft.
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Subbarao, N.V.V.S.S.T., Mani, J.K., Shrivastava, A. et al. Acreage estimation of kharif rice crop using Sentinel-1 temporal SAR data. Spat. Inf. Res. 29, 495–505 (2021). https://doi.org/10.1007/s41324-020-00374-2
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DOI: https://doi.org/10.1007/s41324-020-00374-2