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Acreage estimation of kharif rice crop using Sentinel-1 temporal SAR data
Subbarao Nandepu V. V. S. S. Teja,Mani Jugal Kishore,Shrivastava Ashish,Srinivas Kumar Samayamantula,Varghese A. O. 대한공간정보학회 2021 Spatial Information Research Vol.29 No.4
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 20640 030 ’ to 21600 180 ’ N latitude and 79440 930 ’ to 80080 700 ’ 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.
Sandip P. Patil,Bhaskar Bethi,G.H. Sonawane,V.S. Shrivastava,Shirish Sonawane 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
Bi2O3-bentonite nanocomposites successfully synthesized by intercalation method, are used forphotocatalytic degradation of Rhodamine B (Rh B) under visible light irradiation. Bi2O3-bentonite showsenhanced photocatalytic efficiency than pure Bi2O3 due to intercalation with bentonite. Removal of Rh Bis achieved upto 98.5% using 3 gL 1 photocatalyst at pH 3. It is found that increase in light absorption anddecrease in electron-hole recombination enhances photocatalytic efficiency. Photocatalytic degradationof Rh B by Bi2O3-bentonite proceeds via advanced oxidative process. The plausible mechanism ofphotocatalytic degradation Rh B reported by LC-MS shows generation of different degradation productsincluding benzoic acid and benzonium ion.