航空照片数字地图的几何校正

A Cost-Effective Method for Accurate Target Location

如何减少在航空照片数字地形图制作过程中的几何失真 ,已成为提高数字地形图定位精度的重要问题。针对航片数字地图的几何失真问题提出了一种简单实用的几何校正方法 ,该方法是利用一定的数学模型通过控制点解算的方法对图像进行几何校正 ,该方法简单灵活 ,需用设备少 ,适合工程实际应用。

Accurate digital terrain maps are essential to accurate target location. Geometric distortion, mainly due to deviation of optical axis of photographic equipment from vertical, causes inaccuracies in digital terrain maps. We present a method for reducing greatly the geometric distortion. The method is cost-effective because the usually required special equipment is no longer needed. It is also simple because it needs only three certain control points in each digital map instead of every grid point of the map; this is very important when a great amount of digital terrain maps of airscape images needs to be produced. We used this cost-effective and simple method to make RPV(remotely piloted vehicle) digital terrain maps of airscape images; the results do show that our method of correction of geometric distortion is satisfactory.