Texture Mapping of 3d Building Models with Oblique Direct Geo-referenced Airborne Ir Image Sequences

Infrared (IR)-radiation of buildings can be captured by thermal image data. Nowadays, thermal images of different parts of buildings acquired in various scales are analysed, however conducted analysis concern mainly the radiometric characteristics, avoiding dealing with the geometry of the images. Aim of our work is the automated texture mapping of existing 3D building models with images recorded by IR cameras. In this way, 2D images are connected with a 3D GIS database and can be further analysed together with the information about the geometry of objects. The extraction of the front facades textures of our test area was already obtained using the terrestrial images acquired from the mobile platform. However those image sequences are restricted to the facades at the street sites. Roof structures or backyards cannot be recorded in this way. Oblique images taken from the helicopter are expected to provide a sufficient complement of the missing data. The flight path was recorded by an inertial measurement unit (IMU) and GPS. In order to utilize the INS/GPS data, first the IMU misalignment with respect to the camera axis has to be corrected. Then the texture mapping is performed without any additional refinement of camera position. The evaluation of obtained textures is performed and some additional methods for their improvement are proposed.