| Airborne multi-angle and multi-spectral imaging system is a new remote sensing system. It is researched mainly based on the original Widas system as prototype, using aerial photography plane as it platform. At present, there many theoretical researching problems in quantitative remote sensing, like inversion algorithm actual to test and verify, the direction problem of inversion model, the lacking of high precision spectrum remote sensing date, and so on. With the demand of these requirements, it is necessity to research these sets of system. It is a important guarantee to our country to keep the advanced position not only in theory, but also the technical support when compared with the foreign counterparts. This subject came from State Key laboratory of remote sensing science in Institute of remote sensing application which invention airborne remote sensing devices for future researching needed. In the process of designing, referenced the related sets of the experiences of remote sensing airborne equipments which have invented, especially early AMTIS and Widas system that used in heihe experiments in2008.Airborne multi-angle and multi-spectral system consists two Conder-1000MS5-285Model multi-spectral CCD cameras and a S60infrared camera, using multi-angle three-dimensional observation model, it is a earth observation equipment which integrates computer technology、differential GPS technology、the external system date synchronization technology etc. when compared with original Widas system, each devices can be more coherence work, the imaging modalities are more reasonable, beneficial for various requirements in quantitative remote sensing date resources. Besides, it is also have traditional remote sensing airborne equipment mobile flexible、 short production cycle、high precision etc advantages, will have broad application prospects in the future.The main researching contents of this article spread from two big aspects:one is some key parameters design in hardware, the other is the image date processing and influencing factors analysis of processing accuracy. Specifically includes the following aspects: (1)Through comparing with the current domestic and foreign remote sensing imaging system, proposed the new system imaging mode, that mainly used several cameras to achieve the multi-angle observations, it reduced the original wide-angle image distortion which using wide angle lens, and the defects of image model too single.(2)Researched Widas system calibration principle, especially radial distortion and decentering distortion impacts in Widas system. Through the specific distortion mechanism researching, grasped how to improve the image quality through camera itself system distortion.(3)In the date processing, now we using original Widas date as our research object, Specific researching how to obtain image date and ground control date, through the actually computer elements of exterior orientation and acquire ground coordinates through stereo images, Such processing enhanced image processing capabilities.(4)Analyzed the impacts of external factors in aerial photography, like ratio of speed and height influence the time interval in aerial photography, topographic relief influence aerial photography overlap rate and aerial photography scale, it is also do a specific calculation to multi-band camera system in each band’ s image point displacement.(5)Combination the now existing work, proposed airborne remote sensing system equipment improving scheme and plan, and outlook the cross-platform application in the future, finally conclusion the importance that combined the traditional aerial photography measurement techniques and knowledge of remote sensing theories. |
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