Fernando Vanegas等人使用了一种基于无人机遥感的方法,以提高现有人工检查和昆虫诱捕器等监测手段来检测病虫害侵扰(例如葡萄园中的葡萄叶枯病,图1)的效率。该方法利用集成到无人机上的高光谱、多光谱和RGB传感器的数据,开发一种新的方法来收集、处理、分析和整合多光谱、高光谱、地面和空间数据,以获取不同分析结果。这种方式将为研究人员、农业专家和无人机从业者提供可靠的数据收集方法,以实现更快分析研究。
The flow field of a laboratory-simulated tornado was studied by means of 2-D ParticleImage Velocimetry or PIV technique with the purpose of investigating the effects of roughness onthe near-ground tornado-like vortex structure and its velocity distribution. The results show the flowregime transition from multi-celled vortices over the smooth surface at a higher swirl ratio to singleordual-celled vortices with roughness. Significant difference in velocities and turbulencecharacteristics is observed as a result of increasing ground roughness. This work is part of a projectthat seeks better understanding of the near-ground flow field and resulting wind-induced loads onstructures in a tornado.