海岸带水边线等高条件控制下的航空影像外部定向

Exterior Orientation for Aerial Imagery Controlled by Equal-elevation Condition of Line of Water Area in Coastal Zone

提出了一种基于海岸带水边线等高条件的航空影像外部定向方法,该方法将局部区域水边线上各点的高程值相等作为控制条件,在立体像对的外部定向中,引入这些等高点,和其他平高控制点一起参加平差,计算立体像对的绝对方位元素。实验证明,该方法能够有效地提高航空影像的外部定向精度,尤其是高程的定位精度,提高了海岸带地形的测图精度。

In this paper, an exterior orientation method of aerial imagery which was based on the equal-altitude condition of the coastline was proposed. This method regarded that points on the line of water area ot a local area were equal in elevation as a control condition, and in exterior orientation of the stereo images, introduced these equal-elevation points into the adjustment, calculating with elements of exterior orientation of the stereo images. The experimental results indicated that the method improved the precision of exterior orientation of aerial imagery, especially the precision of elevation, and improved the precision of the coastal topographic map.