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Digital airborne cameras are now penetrating the fields of photogrammetry and remote sensing. Due to the last decade's results in research and development in the fields of for instance detector technology, computing power, memory capacity position and orientation measurement it is now possible to generate with this new generation of airborne cameras different sets of geometric and spectral data with high geometric and radiometric resolutions within a single flight. This is a decisive advantage as compared to film based airborne cameras. The linear characteristic of the opto-electronic converters is the basis for the transition from an imaging camera to an images generating measuring instrument. Because of the direct digital processing chain from the airborne camera to the data products there is no need for the processes of chemical film development and digitising the film information. Failure sources as well as investments and staff costs are avoided. But the effective use of this new technology requires the knowledge of the features of the image and information generation, its possibilities and its restrictions.
This book describes all components of a digital airborne camera from the object to be imaged to the mass memory device. So the image quality influencing processes in the nature are described, as for instance the reflection of the electromagnetic sun spectrum at the objects to be imaged and the influence of the atmosphere. Also, the essential features of the new digital sensor system, their characteristics and parameters, are addressed and put into the system context. The complexity of the cooperation of all camera components, as for instance optics, filters, detector elements, analogue and digital electronics, software and so forth, becomes transparent. The book includes also the description of an example system.
Introduction.- Foundations and definitions.- The imaged object and the atmosphere.- Structure of a digital airborne camera.- Calibration. Data processing and archiving.- Examples of large-scale digital airborne cameras.- Index.
1Dr. Rainer Sandau, PhD 1997 and habilitation 1990, is Chief Scientist at the German Aerospace Center (DLR) in Berlin, Germany. He has over 25 years of experience in airborne and spaceborne remote sensing activities. He was involved in optoelectronic ins