6Urban 3D Building Extraction Through LiDAR and Aerial Imagery
6.1Introduction
To meet the increasing requirement for accurate three-dimensional models of buildings, continuous updates for urban planning, cartographic mapping, and civilian and military emergency responses, the efforts for building extraction using a variety of data sources have been made in the past in remote sensing, photogrammetry, image processing, and computer vision communities. The previous methods can be grouped into three categories in terms of the employed data sources. The first category uses optical imagery, such as aerial imagery and high-resolution satellite imagery (e.g., IKONOS). The second category utilizes active imagery data, such as LiDAR data and radar ...
