AMSS图像几何畸变来源分析

与星载MSS(或TM)相比,AMSS成像具有独特的特点,其为行扫描方式,扫描视场角大,飞机飞行高度低,运动变化大,姿态稳定性差。因此,各种成像干扰因素对AMSS图像的影响更为严重,引起的图像几何畸变更为复杂,校正不仅非常困难,而且仿卫星扫描图像几何模式得不到正确有效的校正效果。本文详细地定量分析了各种因素对AMSS图像几何特性的影响,希望有助于AMSS图像几何畸变校正方法的研究。     

THE HYDROGRAPHIC APPLICATION OF SPACELAB PHOTOGRAPHY

Metric Camera photography has been examined by the Hydrographic Department to assess its potential in nautical chart compilation and revision. Some interesting benefits are reported in the positioning and delineation of offshore features.     

SOME ASPECTS OF PHOTOGRAPHY IN AIRBORNE SENSING

The paper discusses aspects of air photography and electronic processes which produce imagery by infra-red radiation and by radar waves. After preliminary comments on lenses, laboratory techniques and colour photography, the author indicates certain advantages in simultaneous photography using black and white, infra-red and colour films. Moreover, information is given on simultaneous photography by satellite and the paper terminates with a resume of methods that are used to obtain imagery by infra-red radiation and by radar.     

CENSUS OF GREY SEALS BY AERIAL PHOTOGRAPHY

The factors determining resolution in aerial photography of wildlife concentrations are considered and two developments that improve resolution with inexpensive equipment are described. Firstly, a rocking camera mount has been constructed that compensates for apparent image motion resulting from forward movement of the aircraft. The mount allows slower shutter speeds to be used so that aerial surveys can be conducted using high resolution colour film under poor light conditions. Secondly, critical prefocusing to the survey flying height is carried out, even for lenses of short focal length. Aerial photography of grey seal breeding colonies is used to illustrate these developments.     

加快四川省航空摄影的方法初探

本文提出加快四川省航空摄影的重要性，根据四川的气候条件，提出具体可航摄的季节和加快航摄进程及提高航摄质量的有关解决办法。     

EVALUATION OF SPACELAB PHOTOGRAPHY FOR SMALL SCALE MAPPING

The paper presents an assessment of the results of a practical investigation into topographic interpretation from photography taken from the Spacelab Mission launched on 28th November, 1983. Hunting Surveys Ltd. had carried out mapping at 1:100 000 scale of part of Oman from photography taken in 1981 and stereoscopic cover of this area from Spacelab was available, so providing the opportunity of a comparison of the interpretation with the existing mapping.     

SPOT5影像严格几何纠正方法研究

根据SPOT卫星的成像原理和特点,讨论了对SPOT5卫星影像按共线方程法进行有控制点的几何纠正的方法,经对关中、陕北和陕南三种地形的影像纠正结果进行对比检验,证明了该方法精度达到了较高水平。     

CONSIDERATIONS OF SPECIFICATIONS FOR SMALL FORMAT AERIAL PHOTOGRAPHY

Following the success of the symposium held by the Photogrammetric Society on 31st March, 1987, a second one-day symposium was convened to give further support to the rapidly growing interest in the development of small format photography for aerial survey. This was held at Burlington House, London on 1st November, 1988. Over 70 people attended. Six of the papers are reproduced here, dealing with a range of topics including specifications for and navigation of small format aerial photography, the creation of digital terrain models from 35 mm photography, wildlife surveys in the Arctic and survey photography from model aircraft and tethered balloons.     

THE USE OF COLOUR PHOTOGRAPHY FOR LARGE-SCALE MAPPING

Ordnance Survey experimental work has shown that colour film developed to a reversed positive image is best suited to the photogrammetric problems of large-scale mapping. Tests have shown no difference in accuracy between maps produced from colour photography and those produced from monochrome photography. The economy of using colour photography in this field has yet to he demonstrated.     

SOME ASPECTS OF IMAGE QUALITY IN SATELLITE PHOTOGRAPHY

The author discusses factors which affect satellite imaging systems and in particular the qualities of the Metric Camera and Large Format Camera photography.     

ACCURACY OF HEIGHTING FROM VERTICAL PHOTOGRAPHY OBTAINED BY HELICOPTER

Experimental photography at scales up to 1 : 500 has been taken and analysed, subsequently, using Zeiss C8 and Wild A8 instruments. Results indicate that a 25 mm contour interval may be achieved on reliable surfaces, such as roads and aerodrome runways.     

EVALUATING IMAGE QUALITY OF SMALL FORMAT AERIAL PHOTOGRAPHY SYSTEMS

The use of small format systems for aerial photography as an alternative to employing the more customary larger 230×230 mm format cameras continues to gain acceptance in a number of applications on the basis of the lower operating costs involved. The reduced costs and relative ease of operation with small format systems can attract unskilled operators who, by producing inferior photographic coverage, may delay the more widespread introduction of smaller systems for photo-interpretation and photogrammetric surveys of local sites. Anticipating the need for a flying and photography specification that would serve the needs of all interested parties, a series of laboratory trials were undertaken in conjunction with a literature review to quantify the comparative image quality performance of both large and small format systems. The spatial resolution of a typical small format system was assessed by photographing a low contrast resolution target using a collimator-based system and also by directly recording the target at a predetermined reduction scale. Comparative results between the two methods of evaluation are assessed and a comparison is made with the performance of larger format cameras.     

超小比例尺彩红外高空摄影应用探讨

本文介绍了国内外超小比例尺彩红外高空摄影像片应用现状,并对它的光谱分辨率、空间分辨率、综合分辨率、专题表达能力、成本等进行了较深入的分析,以探讨其应用于环境与资源调查的技术经济性能。研究表明,超小比例尺彩红外高空摄影像片的应用有着广阔的前景。