實驗結果表明，我們所提出的模型在天災預測方面達到了65% 的Precision、69%的Recall、以及67% 的F1 Score。除此之外，在模型準確預測的天災案例中，我們觀察到天災發生當日對美國玉米期貨市場價格的影響，無論是從期貨交易筆數、還是從整體價格的漲/跌幅的角度來看，我們發現價格多數呈現上漲趨勢。綜合上述，本研究展示了結合遙測技術和機器學習在農業監測和災害管理領域的應用潛力。;Our study aims to explore the impact of natural disasters on the Normalized Difference Vegetation Index (NDVI) in major corn-producing areas of the United States, and its potential influence on the US corn futures market, through the integration of remote sensing technology and machine learning methods.
To this end, we propose a model that combines an Auto-Encoder and Local Outlier Factor (LOF). Initially, the Auto-Encoder is utilized for feature learning to capture key characteristics within the data. Then, the trained Auto-Encoder′s encoder is used to transform the original dataset, serving as the input for the LOF model for anomaly detection (predicting natural disasters). Finally, through multi-stage parameter adjustments, our study seeks the optimal configuration of parameters and anomaly threshold settings.
The experimental results indicate that our proposed model achieved 65% Precision, 69% Recall, and 67% F1 Score in disaster prediction. Furthermore, in the disaster cases accurately predicted by the model, we observed the impact on the United States corn futures market price on the day of the disaster. From the perspective of both futures trading volume and overall price fluctuations (rising or falling), we found that prices generally showed an upward trend. In summary, our study demonstrates the potential application of combining remote sensing technology and machine learning in the fields of agricultural monitoring and disaster management.
