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RISS 인기검색어
- 검색키워드
- 저자 : Avinash Kumar Ranjan (검색결과 3 건)
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Avinash Kumar Ranjan,Bikash Ranjan Parida 대한공간정보학회 2019 Spatial Information Research Vol.27 No.4
Rice is an important staple food for the billions of world population. Mapping the spatial distribution of paddy and predicting yields are crucial for food security measures. Over the last three decades, remote sensing techniques have been widely used for monitoring and management of agricultural systems. This study has employed Sentinel-based both optical (Sentinel-2B) and SAR (Sentinel-1A) sensors data for paddy acreage mapping in Sahibganj district, Jharkhand during the monsoon season in 2017. A robust machine learning Random Forest (RF) classification technique was deployed for the paddy acreage mapping. A simple linear regression yield model was developed for predicting yields. The key findings showed that the paddy acreage was about 68.3–77.8 thousand hectares based on Sentinel-1A and 2B satellite data, respectively. Accordingly, the paddy production of the district was estimated as 108–126 thousand tonnes. The paddy yield was predicted as 1.60 tonnes/hectare. The spatial distribution of paddy based on RF classifier and accuracy assessment of LULC maps revealed that the SAR-based classified paddy map was more consistent than the optical data. Nevertheless, this comprehensive study concluded that the SAR data could be more pronounced in acreage mapping and yield estimation for providing timely information to decision makers.
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Avinash Kumar Ranjan,Aditya Kumar Patra,A. K. Gorai 한국기상학회 2021 Asia-Pacific Journal of Atmospheric Sciences Vol.57 No.3
Detailed, reliable, and continuous monitoring of aerosol optical depth (AOD) is essential for air quality management and protection of human health. The satellite-based AOD datasets have been typically used in many studies for the estimation of particulate matter (PM2.5 and PM10) concentration in the tropospheric region. The prime focus of this study is to review the past studies to analyze the performance of various satellite-based AOD datasets and models used for PM estimation. The review results suggest that every satellite sensors data have some specific capabilities as well as some drawbacks. Multi-angle imaging spectroradiometer (MISR) and visible infrared imaging radiometer suite (VIIRS) datasets showed better consistency in AOD and PM estimation in comparison to the moderate resolution imaging spectroradiometer (MODIS) datasets. In the context of PM estimation models’ accuracy, the mixed-effect model (MEM) has been extensively used and found to be more consistent in general, whereas, geographically weighted regression (GWR) model outperforms other statistical regression models in regional scale. Incorporation of land use parameters along with meteorological parameters improves the PM estimation accuracy at various spatial scale. The review suggests that in the near future, high resolution (spatial and temporal) satellite data with the improved algorithms will be highly appreciable for accurate estimation of AOD and PM.
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Patro Kanhu Charan,Avinash Ajitesh,Banidutta Arya,Kundu Chitta Ranjan,Bhattacharya Partha Sarathi,Pilaka Venkata Krishna Reddy,Muvvala Mrutyunjayarao,Kumar Ayyalasomayajula Anil,Aketi Srinu,Karthikeya 대한방사선종양학회 2024 대한방사선종양학회지 Vol.42 No.2
Surface mould brachytherapy is a conformal radiotherapy technique that can deliver high dose to the target while sparing nearby normal structures, Here, we aim to describe the procedurals details for high-dose rate (HDR) surface mould brachytherapy in sebaceous carcinoma of eyelid in a 54-year old lady. She was hesitant for surgery and any form of invasive intervention like interstitial brachytherapy. So, she was treated with surface mould HDR brachytherapy to a total dose of 52 Gy in 13 fractions at a dose of 4 Gy per fraction delivered twice daily using Iridium-192 isotope with no acute side effects. She was evaluated on a weekly basis for any radiation side effects and now she is disease-free for 6 months post-treatment with only mild dry eye. A detailed step-by-step procedure of surface mould technique, simulation procedure, dose prescription, planning, plan evaluation and treatment has been described in this paper. Surface mould HDR brachytherapy can be safely used as organ preserving modality of treatment for eyelid carcinoma.
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