ABSTRACT
This chapter addresses the major approaches to 3D data collection and object reconstruction. The advancement of sensor technologies has opened up many new avenues for acquiring 3D data. One of the major advancements in mapping is the increasing use of the direct georeferencing technology. Direct georeferencing provides both position and orientation information of onboard sensors using integrated inertial devices and positioning systems. Image-based 3D data acquisition has been in practice for years. It is well known and well documented in many reference books on photogrammetry. 3D data acquisition and object reconstruction is conventionally performed using stereo image pairs. Stereo photogrammetry, based on a block of overlapped images, is the primary approach for 3D topographic mapping. Fully automatic building reconstruction has received much attention in the research community. Single image-based methods utilize the image projection of the geometric perspective of the ground objects.
