共查询到20条相似文献,搜索用时 343 毫秒
1.
高分辨率数字航测相机现状和思考 总被引:4,自引:0,他引:4
本文根据国内外数字航测相机发展的实际情况,对于新型数字航测相机视场角、影像分辨率、像移补偿、摄影间隔和影像存贮器容量、相机系统的动态定位与定向以及真彩色与多光谱摄影等技术问题进行了分析并给出了相应的结论。 相似文献
2.
3.
介绍了国际上具有代表性的数字航测相机系统(ADS40、DMC、UhraCamD和DiMAC)的特点及其主要技术参数.实用化的数字航测相机应同时具备高分辨率和大视场的特性,才能保证在高精度成图的同时提高作业效率.结合我国自主研制的第一台大面阵彩色CCD航测相机,详细地介绍了相机系统的"3 1"技术路线、相机参数和系统组成.相机综合试验的结果表明,相机系统完全可以满足大比例成图精度的要求. 相似文献
4.
随着面阵数字航测相机在航空摄影领域的广泛使用,其参数校准成为亟待解决的关键问题。本文首先阐述了精密测角法的校准原理,在此基础上设计了基于大口径长焦距平行光管、精密测角转台和亚像素目标定位算法的面阵数字航测相机校准装置;其次通过对装置的误差分析,证明了该装置精度满足测绘行业标准中对数字航测相机的校准精度的要求;最后验证了该装置对面阵数字航测相机的实验室校准是可行的。 相似文献
5.
6.
7.
8.
9.
稀少控制航测可以大大减少外业测绘的工作量,随着GPS辅助航测技术的发展,使稀少控制测绘成为可能。本文以国产SWDC航摄仪为研究基础,阐述了GPS辅助数码空中三角测量的原理、技术流程及具体测区稀少控制的典型航测试验。结果表明,SWDC航摄仪的航测精度满足1∶1万地形测绘需求,验证了国产SWDC实施稀少控制航测的应用可行性。 相似文献
10.
宽角相机低空航测的精度分析 总被引:1,自引:0,他引:1
首先从理论上对低空航测精度与相机像场角的关系进行了定量分析,得出低空航测应尽可能使用宽角相机的结论;接着指明了单镜头相机扩大像场角的局限和现有市场上的组合宽角相机因重量过大而不适用于低空轻荷载无人机的不足,阐述了作者研制的具有自检校自稳定功能的组合宽角低空轻小型相机的特点,尤其是实现组合成像静态误差和动态误差自检校的技术原理;针对大比例尺测图的实践,提出通过宽角相机大重叠航空摄影提高低空航测精度的技术建议;最后用典型工程生产数据验证了上述理论分析的正确性。 相似文献
11.
SWDC-4数码航测相机填补了国产数字航测仪相机的空白,与国外UCD、DMC等相机相比具有众多优势,更适用于1∶10 000基础测绘数据更新。本文介绍了SWDC-4在邵阳基础测绘数据更新项目中的作业流程和技术设计过程,统计分析了空三加密和最终DLG产品的精度,为SWDC-4在其他基础测绘数据更新项目中的应用提供了借鉴。 相似文献
12.
The Principal Point and CCD Cameras 总被引:1,自引:0,他引:1
The principal point has long been regarded as one of the fundamental parameters in camera calibration. In the age of film based aerial and large format terrestrial cameras, the principal point could be located by a variety of techniques with a certainty of ±10 mm (Carman and Brown, 1961) and this was considered sufficient. However, aerial cameras were precision, purpose built, expensive pieces of equipment where the assembly was painstaking and the location of the principal point measured to a known tolerance. In the digital era, photogrammetrists, and many others, are using cameras which have not been specifically designed or built for photogrammetry. For these cameras there is no requirement for the manufacturers to position the lens in a pre-defined location relative to the image sensing plane or for the lens manufacturer to align the lens elements precisely. In fact, deviations from the centre of the sensor can be a considerable percentage of the extent of the sensor (up to 10 per cent for some zoom lenses (Burner, 1995)). This paper discusses the development of methods of obtaining the location of the principal point, considers the relationship between the principal point and other parameters in the functional model, and shows how the location of this point can be estimated with and without recourse to autocollimation methods. 相似文献
13.
随着数字成像技术的发展,数字航空摄影仪必将逐步取代胶片航空摄影仪,在胶片航空摄影中取得的一些航摄设计的技术参数将不再适用于数字航空摄影。本文基于数字航摄的特点,从航摄任务出发,就数字航空摄影时如何较合理的选择相应的数字相机和进行航摄设计等问题进行了初步分析和探讨。 相似文献
14.
15.
从数字地球到智慧地球 总被引:33,自引:2,他引:31
分析了数字地球的发展及其取得的成就,探讨了伴随着IT技术、通信技术和传感器技术的发展而出现的传感器网络和物联网这一新的基础设施,设计了基于全IP架构的物联网的平台框架和典型应用,并展望了从数字地球发展到智慧地球的趋势和美好前景。 相似文献
16.
17.
直接线性变换(D irect LinearTransformation)解法是建立观测点像方空间坐标和同名点物方空间坐标之间直接线性关系的算法。本次试验通过使用普通数码相机,并应用2维直接线性变换进行了建筑物变形监测的试验研究,试验结果表明,使用普通数码相机代替常规测量方法能够满足变形监测三等精度要求。 相似文献
18.
The first author commenced his experiences with aerial photography in 1945, when he joined the Royal Air Force (RAF). The aerial cameras used at that time were the Williamson F24 and F52, with Ilford HP3 and FP3 panchromatic films. Subsequently the Williamson F95 camera was tested against the USAF Sonne 11 camera. During his final years in the RAF, a variety of film types was employed: colour, monochrome infra-red and false colour infra-red. Additional experience was gained when the author was employed by the International Training Centre (ITC), The Netherlands and he saw the further development of the air camera from the Wild RC8 and Zeiss (Oberkochen) RMK 15/23 to the Wild RC20, Zeiss (Jena) LMK and Zeiss (Oberkochen) RMK TOP. He predicts that the future lies with digital cameras.
The second author started working with aerial photography in the 1950s. Details are given of cameras, visual navigation sights and survey aircraft dating from that period. Overseas operations, carried out mainly by Hunting Surveys and Fairey Surveys, posed particular problems because the majority of the work there was undertaken without the aid of existing maps. The introduction of external navigation systems is described, from the Decca ship navigation system, through the GNS-200 VLF/Omega low frequency radio system to INS, the Inertial Navigation System. The author later joined the ITC, which enabled him to participate in trials of the Computer-controlled Photo Navigation System. Eventually practical experience was gained with differential GPS, particularly in countries in southeast Asia. Aerial photography currently appears to benefit less from financial investment than the photographic, aviation and survey industries. However, the satisfaction of making a significant contribution to major overseas development projects outweighs the frustration of lack of acceptance of plans for the future of the air survey industry. 相似文献
The second author started working with aerial photography in the 1950s. Details are given of cameras, visual navigation sights and survey aircraft dating from that period. Overseas operations, carried out mainly by Hunting Surveys and Fairey Surveys, posed particular problems because the majority of the work there was undertaken without the aid of existing maps. The introduction of external navigation systems is described, from the Decca ship navigation system, through the GNS-200 VLF/Omega low frequency radio system to INS, the Inertial Navigation System. The author later joined the ITC, which enabled him to participate in trials of the Computer-controlled Photo Navigation System. Eventually practical experience was gained with differential GPS, particularly in countries in southeast Asia. Aerial photography currently appears to benefit less from financial investment than the photographic, aviation and survey industries. However, the satisfaction of making a significant contribution to major overseas development projects outweighs the frustration of lack of acceptance of plans for the future of the air survey industry. 相似文献
19.
几种常见数字航摄仪的分析与比较 总被引:1,自引:0,他引:1
数字航摄仪是直接获取高精度数字影像的重要手段之一。文中介绍当前国际上3种主流数字航摄仪ADS40(Airborne Digital Sensor 40)、DMC(Digital Mapping Camera)及Ultra CamD(UCD),并分析三者的成像原理及关键技术,同时从多个方面对三者进行评估和比较。 相似文献