地基天空成像系统的地理空间透视重投影
Geospatial Perspective Reprojections for Ground-Based Sky Imaging System
摘要：
天空成像系统使用透镜来获取将光束集中在传感器中的图像。由天空成像器接收的光束具有相对于设备法线的仰角。因此，图像中的像素包含来自成像系统视场内的天空的不同区域的信息。包含在像素中的视场的面积随着入射光束的仰角减小而增大。当天空成像仪安装在太阳跟踪器上时，光束在像素中的入射角随时间而变化。这项调查制定和比较两个地理空间的重投影，将原来的欧几里德帧的成像仪平面的地理空间大气横截面的天空成像仪的视野相交的云层。假设一个对象（即，云）在对流层中移动足够远，因此地球表面近似为\emph{flat}。另一个变换考虑了地球在大气部分中的曲率（即，voxel），即记录。结果表明，当太阳仰角低于$30^\circ$时，两种地理空间转换计算的维度之间的差异在千米数量级。
英文摘要：
Sky imaging systems use lenses to acquire images concentrating light beams in a sensor. The light beams received by the sky imager have an elevation angle with respect to the device normal. Thus, the pixels in the image contain information from different areas of the sky within the imaging system field of view. The area of the field of view contained in the pixels increases as the elevation angle of the incident light beams decreases. When the sky imager is mounted on a solar tracker, the light beam's angle of incidence in a pixel varies over time. This investigation formulates and compares two geospatial reprojections that transform the original euclidean frame of the imager plane to the geospatial atmosphere cross-section where the sky imager field of view intersects the cloud layer. One assumes that an object (i.e., cloud) moving in the troposphere is sufficiently far so the Earth's surface is approximated \emph{flat}. The other transformation takes into account the curvature of the Earth in the portion of the atmosphere (i.e., voxel) that is recorded. The results show that the differences between the dimensions calculated by both geospatial transformations are in the order of magnitude of kilometers when the Sun's elevation angle is below $30^\circ$.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
