海岸带地区SPOT-5遥感影像无控制点正射校正方法

Orthorectification of SPOT-5 remote sensing image without GCP in coastal zone

本文利用ENVI遥感软件处理平台,针对海岸带地区影像特点,对传统的SPOT-5遥感影像正射校正流程进行改进,主要有:增加SPOT传感器辐射校正;在影像融合前,使用伪正射校正代替几何校正;利用GDEM数据代替传统的DEM测量数据及野外测点数据;使用Google Earth Bridge功能检验校正结果精度。结果表明:经过改进的无控制点正射校正流程可有效减少人为误操作产生的误差,降低了正射校正的难度,提高了影像处理的效率,拓宽了影像检验的思路。正射校正影像精度符合研究要求,取得较为满意的结果。

Based on the ENVI remote sensing software, the paper provided several methods to improve traditional orthorectification process of the SPOT-5 image according to the features of coastal zone, such as： increasing SPOT sensor radiometric calibration, using false-orthorectification instead of geometric correction before image fusion, using GDEM data instead of traditional measured data and measured point data in the field, testing the definition of results by the Google Earth Bridge function. The results showed that the im- proved processing, non-GCP-orthorectification, could reduce the error caused by human errors effectively, and reduce the difficulty of orthorectification to improve the efficiency of image processing, and provide the new way in image testing. The study results could meet the requirements which were satisfied with the better definition of the SPOT-5 image.