3D Reconstruction of Building Based on High-Resolution SAR and Optical Images

Abstract

In high-resolution SAR image, the building can form the layerover and shade. Basing on the imaging equation of SAR image, we can extract the height, width and location information of the building. The high-resolution optical image can reflect the roof shape and location of the building. But the information in optical image is so rich that it can produce heavy error when extracting the roof of the building with some automatic methods. In order to extract the roof accurately, we attempt to fuse the SAR image with the optical image. Because the building's layerover can reflect the building's location, by the imaging equation of SAR image and that of optical image, we use the layerover of building in SAR image to confirm the approximate location of the building's roof in optical image. Thus, we obtain a small window that includes the roof of the building, and use the ISODATA method to classify the small window to get the roof class. In the end, we use the height, width, location and roof information to reconstruct the building. The result proves that me method is a good idea.