This parameter can be employed for ship detection and bridge detection from a polarimetric SAR image. 该参数能在河流区域很好地进行舰船检测与桥梁检测。
Then,the difficulty for mechanical checking from those was given,and a research way for total property and local damaging of bridge structure was pointed out. 总结了通过试验及计算进行桥梁检测和评估的难点，以及进行桥梁整体结构与局部损伤研究的一种途径和方法。
