研究目的
To map paddy acreage and predict yields using Sentinel-based optical and SAR data in Sahibganj district, Jharkhand, India, during the monsoon season of 2017.
研究成果
The study successfully mapped paddy acreage and predicted yields using Sentinel data, with SAR data providing more reliable results for paddy mapping. The RF classifier and regression models are effective, offering timely information for agricultural decision-making, though improvements are needed for broader applicability and accuracy.
研究不足
The study is limited to a specific district and season, with potential overestimation of yields due to limited survey data. Optical data are affected by cloud cover during monsoon, and SAR data may have misclassifications in certain areas like bareland or mining regions.
1:Experimental Design and Method Selection:
The study used a comparative approach with optical (Sentinel-2B) and SAR (Sentinel-1A) satellite data. A Random Forest (RF) classifier was employed for land use/land cover (LULC) classification, and a simple linear regression model was developed for yield prediction.
2:Sample Selection and Data Sources:
Field data included GPS points from 38 paddy plots collected using a handheld GPS, and survey data from 80 farmers in 8 villages for area, production, and yield (APY) data. Satellite data were acquired from USGS (Sentinel-2B) and ASF (Sentinel-1A).
3:List of Experimental Equipment and Materials:
Handheld GPS (Garmin eTrex-30), SNAP software for data processing, ArcGIS software for map layout, Sentinel-2B and Sentinel-1A satellite data.
4:Experimental Procedures and Operational Workflow:
Pre-processing of SAR data included thermal noise removal, speckle filtering, radiometric calibration, and terrain correction using SNAP. RF classification was applied to generate LULC maps. Accuracy assessment was done using confusion matrices with ground truth points. Yield prediction used regression models based on survey and historical data.
5:Data Analysis Methods:
Statistical analysis included calculation of accuracy metrics (e.g., kappa coefficient) and regression analysis for yield prediction.
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