朵云信息辅助卫星影像扫描区域的概略定位

利用卫星遥感影像中朵云与其阴影的成像差异以及扫描区域与成像时刻太阳方位角的关系,建立了3种云朵高度的计算公式。在此基础上,进一步提出了概略计算扫描区域坐标的方法。实验结果表明,该方法有效地解决了在缺乏传感器摆角的情况下对扫描区域的概略定位问题。根据推导的公式,利用物体与阴影在太阳赤纬角上的分量,还可以解决摄影时间不精确情况下的物体高度计算。该方式比用太阳高度角在时间上的敏感程度要小,因而降低了对时间的要求,尤其对单片航空摄影测量中物体高度计算更有利。

Initial Location for the Scanning Region of the Remote Sensing Imagery Based on the Cloudlet

The paper first analyses the difference between the cloudlet and its shadow in the satellite remote sensing image,investigates the relationship between the scanning region and the sun azimuth at the imaging time,and sets up three equations to calculate the height of cloudlet,and proposes the method for the initial location of scanning region.Results of experiments show the proposed method is efficient and effective in approximately positioning the scanning region without the attitude of sensors.Even without the precise imaging time record,it can also be used to solve the object height calculation problem using the components of the object and it shadows on the sun equatorial latitude angle,which is less intensive to time than using the component on the sun azimuth.Thus our proposed method lowers the demand on time,and is more favorable for calculating object height in mono-photo aerial photogrammetry.