Depending on how many camera modules are used in the system, the control electronics consists of up to 3 complete PCI-bus based slot PC's, which are operating a in parallel. The image data of the camera modules are transferred v a parallel bus to high speed frame grabber PCI-bus cards. Finally, the data are transferred via a separate FC-AL link from each slot-cPU system onto a ruggedized RAID hard system with removable storage units. Full modularity allows easy adaptation of standard storage devices to the system. one RAID unit is equipped with a storage capacity of 280 GByte. With a maximum of 3 units the total storage capacity is 840 Gbyte. At full resolution (12bit) and color mode more than 2,000 images can be taken. This is more than 3 rolls of 500 ft film taken with a classical film camera An optional Inertial Measurement Unit (MU) can be integrated into the system, opening up the possibility to work without ground control, or with a reduced set of ground control points. 2.2. Optical Concept The enterpiece of the system is the camera head and the CCD matrix as the key element. technological and economical reasons, it is not possible to choose the ideal solution which would individual, large-area very expensive CCD chip with the size of a "silicon pizza similar to existing film formats. However, for the image recording procedure it is important to have a sensor footprint on ground ground coverage with one shot as wide as possible. This is provided by parallel operation of several compact camera heads, where each CCD has its own lens. The modules are directed to the scene at slightly displaced field angles. Figure 4 shows a ground print taken with four such camera heads This modular approach permits simple scalability of the overall system. The principle of parallel image recording has been established and cross track Y successfully used by Carl Zeiss for Figure 4. Ground coverage of 4 head camera more than 30 years in reconnaissance cameras such as KS-153, and drone camera systems such as KRb 8/24. The high resolution version of the DMC is equipped with four 7k x large chips and performance lenses with a focal length of 120 mm in the panchromatic channel care has over the entire image homogenous fat lenses. sponse of the MTF (Modulation Transfer Function) Each lens is calibrated with a standard goniometer technique. Geometric distortion is described with the parameter model of Brown (1971) The radial distortion is modeled by decentering is described by Aya other parameters are typically much less significant.