Digital surface models and building extraction: A comparison of IFSAR and LIDAR data

In this paper, the task of extracting significant built structure in digita l surface models (DSM) is analyzed. The original data are obtained by means of interferometric SAR or LIDAR techniques and have different resolution a nd noise characteristics. This work aims to make a comparison of what (and how precisely) it is possi ble to detect and extract starting from these models, taking into account t heir differences but applying to them the same planar approximation approac h. To this aim, data over Los Angeles and Denver is considered and evaluate d, The results show that LIDAR data provide a better shape characterization of each building, and not simply because of their higher resolution. Indeed, less accurate results obtained starting from radar data are mainly due to s hadowing/layover effects, which can be only partially corrected by means of the segmentation procedures. However, better results than those already pr esented in the literature could be achieved by using the IFSAR data correla tion map.