Seismic damage information extraction and evaluation of buildings with high resolution remote sensing based on object-oriented method

In order to rapidly determine the scope of stricken area and timely assess the extent of damages after an earthquake, this paper proposes a technical process of rapid extracting and evaluating building damage information by using the geometric structure and texture feature information of high resolution remote sensing images based on the object-oriented building detection method. The process can rapidly locate the disaster areas, which is of great significance to the post-disaster first opportunity rescue. Taking the Yushu area as an example, buildings of disaster area are extracted based on the QuickBird images before and after the Yushu earthquake, and the extraction precisions of buildings is 88. 53% and 90. 21%, respectively. The extraction accuracy of building changing information is 79. 68%, and changing area reaches 15 923. 52 m², which accounts for 68. 16% of the entire studied area, therefore the area is evaluated as moderately-severe disaster area. The results of this paper are consistent with those of the field investigations, proving that the rapid seismic damage information extraction and evaluation process is effective. The presented method can quickly estimate the disaster areas, and provide an important reference for the first time rescue.