Proposal of data source and method for creating 3D models of buildings

Abstract

The main objective of this research was to investigate how oblique imagery can be used to create simple models of buildings. Necessary data for this purpose may be acquired during field surveys, but not all details (in particular the roof) can be seen from the ground level. On the other hand, vertical aerial photos and high-resolution satellite images are not able to present the walls of buildings. Therefore, oblique photos might be a compromise. Such pictures show not only the shape but also the relationships between buildings and their surroundings. Oblique photos can be seen on Google Maps and Bing Maps. But none of them can be legitimately used for community projects like OpenStreetMap (OSM), aimed at creating editable and available without restriction map of the world. Instead, in case of hilly and mountainous areas, taking pictures from points high enough to allow good observation of the area of interest can also be considered sufficient source of such information instead of aerial oblique photos. On that basis the height of buildings, their colors and layout and color of roofs can be determined. The results of the research show, that it is possible to use oblique photographs to construct simplified models of buildings, which satisfy the requirements set by simple 3D buildings schema prepared by OSM developers.

Automatic Detection of Earthquake-Damaged Buildings by Integrating UAV Oblique Photography and Infrared Thermal Imaging

“…Rich, high-resolution textures on the top and sides of ground objects are acquired using oblique images to construct a 3D model in accordance with the principles of human vision. This model [12,24] overcomes the limitations of traditional aerial photography technology, which can shoot only from a vertical angle, and thus can obtain complete and accurate information of ground objects. Such information can provide high-resolution structural and textural information of single buildings and residential areas for post-disaster rescue teams.…”

“…A low-altitude remote sensing system for unmanned aerial vehicles (UAVs) has extensive applications, oblique photography [9,10] has become highly integrated and lightweight, and ultramicro oblique technology has emerged as required by the times. Accordingly, here we establish a 3D model [11,12] conforming to the principles of human vision based on multi-perspective imaging of an ultramicro oblique photography system, which provides high-resolution structural and textural information of single buildings and residential areas for disaster relief teams [13,14]. By applying a combination of infrared thermal imaging technology [15], the temperature field distribution on the external walls of buildings is determined by detecting the radiation energy on the surface of the walls to identify cracks and eliminate hidden dangers after the disaster.…”