ASTER多角度影像云参数模型解算与云迹风反演

ASTER Multi-angle Image Cloud Parameter Model Calculation and Cloud Motion Wind Inversion

卫星资料具有覆盖范围广、时空密度大等优点,能有效地弥补缺测地区观测信息不足的现状,可为天气分析和数值预报模式等研究提供大量有用资料。采用青藏高原西藏阿里地区上空的Terra ASTER多角度影像立体成像像对,结合遥感和摄影测量理论,建立了基于摄影中心、影像点和实际物方点共线关系的云顶三维参数解算模型,用以求取云顶三维坐标和云移动速度,同时依托影像立体像对高度重叠的特点,通过比较两张影像示踪云团的踪迹,反演云迹风风场。通过该两种方法,获取了影响高空云移动的风场分布,最后将两种方法的结果进行对比验证,并采用卫星影像云产品和探空数据对风场规律进行检验。结果表明,云顶三维参数解算模型计算精度较高,误差保持在2个像元内,模型解算与影像反演的风场相似性高、质量好、密度高、验证效果较好,清晰地反映出了高空的风场结构,证明了两种方法的可行性。

Satellite data has the advantages of wide coverage,high temporal and spatial density,etc.,can effectively make up for the lack of observational information in lack-observation areas,and can provide a lot of useful data for research on weather analysis and numerical forecasting models.By using multi-angle stereo image pair of Terra ASTER over Ali region of Tibet on the Qinghai Tibet plateau and combining remote sensing and photogrammetry theory,a cloud three-dimension parameter solving model based on the collinear relationship between the photography center,the image points and the actual object points were established,to obtain the cloud top three-dimension coordinates and cloud movement speeds.At the same time,relying on the characteristics of the high overlap of the image stereo pair,the wind field of the clouds was inverted by comparing trace of the tracer clouds in the two images.Through these two methods,the wind field distribution that affected the movement of high-altitude clouds was obtained.Finally,the results of the two methods were compared and verified by each other,and the wind field law was tested by satellite image cloud products and sounding data.The results show that the cloud three-dimension parameter solving model has high calculation accuracy,the error of which remains within 2 pixels,and the wind field obtaines by model calculation and image inversion has high similarity,good quality,high density and good verification effect,and clearly reflects the high-altitude wind field structure,which proves the feasibility of the two methods.