基于机载SAR影像调绘方法应用研究

Applied Study of Image Annotation Method Based on Airborne SAR

机载高分辨率In SAR技术作为一种新的技术手段,被广泛应用于地形测绘、资源调查及灾害监测等方面。机载In SAR影像不同于光学航空摄影,原有的像片调绘方法已不适用于地物的定性和定位。依据机载SAR成像机理,探讨了形状、色调、阴影等SAR影像直观特征对地物空间的对应关系及判读方法,并对地形起伏、地物高度、叠掩、阴影等引起的定位误差进行分析,提出了提高准确定位的措施。在某40km2的外业调绘项目中,其调绘成果经后期实测数据的精度验证,调绘成果定位中误差为0.87m,满足国家规范要求。

As a new technical means,the airborne high resolution interferometric synthetic aperture radar（ In SAR） has been widely used in topographic mapping,resources survey and disaster monitoring etc. The airborne In SAR image is different from optical aerial photograph,original image annotation method is no longer applicable to ground object characterizing and positioning. According to airborne SAR imaging mechanism,discussed SAR visual image features including form,hue,shadow etc. spatial correspondence with ground objects and interpretation method,carried out analysis of positioning errors caused by topographic relief,object height,layover and shadow etc.,put forward measures to improve accurate positioning. In a 42 km2 field investigation and plotting project,the result after succedent measured data accuracy verification,its positioning mean deviation is 0. 87 m,thus met the requirements of national specifications.