根据桥梁和水体相交的空间关系，提出一种面向对象的高分辨率遥感影像桥梁提取方法，首先利用面向对象的影像分析方法对IKONOS全色影像进行河流、陆地分类；然后将陆地提取为一个矢量图层，同时对分类后的影像进行二值化处理，分成河流和陆地两部分，再经数学形态学处理，获得连通的河流对象，并提取河流为一个矢量图层；最后通过河流与陆地求交的空间运算获得桥梁。实验结果表明，这种方法简单、运算量小、效率高，在从高分辨率遥感影像提取桥梁的实践中具有广泛的适用性。

According to the relation of bridge with water，an object-oriented method to extract bridges from high resolution remote sensing image is put forward as follows.First，use the object-oriented image analysis method to classify the IKNOS image into two classes，water and the land.Second, export all the image objects of land class to a vector shape file.Then binarize the classified image as two parts，the land with white color and the water with black color.Fourth,process the binarized image based on mathematic morphology to get the connected water object.Fifth, extract the water object to a vector file.Finally，the destired bridge is extracted through the intersection of the land and water vector files.An experiment indicates that the method is of universal application with the features of simplicity，small amount of computation and high efficiency.