射电源0851 202,1228 126,1749 701的光学定位

利用北京天文台施密特望远镜ＣＣＤ类星体多色测光巡天中的１５次观测,以ＮＰＭ星表作为参考星表和底片常数法进行处理,得到３颗河外射电源０８５１＋２０２,１２２８＋１２６,１７４９＋７０１的光学位置。文中分析比较了ＩＲＡＦ软件中计算星象中心的三种方法;同时提出应根据待测星的星等（或星象的半峰宽度）选择合适的采样范围。     

Calibration of the Wild P32 Camera Using the Camera-On-Theodolite Method

The calibration of phototheodolites such as the Wild P32/T2 combination sometimes involves determining not only the camera interior orientation parameters but also the camera-to-theodolite parameters. The latter become particularly important when the theodolite set orientation parameters are to be used as observations, especially as known quantities for data reduction in subsequent photogrammetric applications. This paper presents experiments to determine these parameters for a Wild P32 camera using a new camera-on-theodolite method, with details of results achieved.     

The Role of a Digital Intelligent Camera in Automating Industrial Photogrammetry

In the past few years the automation of digital industrial photogrammetric systems has increased dramatically. Due to digital image processing software, coded targets and automatic matching methods, a huge number of photogrammetric measurement tasks can be fully automated. In many cases a "one button click" is enough to provide the three dimensional co-ordinates of measured points without any manual interaction, immediately after acquiring the images. The technology of intelligent cameras is a logical step towards automated photogrammetric measurements. An intelligent camera, which has an integrated computer, analyses the image immediately after it is taken. This technology provides not only a much shorter processing time for the images but also more control over the measurement process just when it is needed, during image acquisition. This takes place in the form of real time feedback.
This paper describes the role of a digital intelligent camera in the automation of an industrial photogrammetric measurement system and gives an overview of existing automation techniques in industrial photogrammetry. As an example of an intelligent camera, the performance of the new INCA digital intelligent camera, developed and manufactured by Geodetic Services, Inc. (GSI) and distributed by Leica, is described.     

The Principal Point and CCD Cameras

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.     

ADS40机载数字传感器的摄影测量处理与应用

ADS40机载多波段数字传感器是徕卜推出的最新传感器，因其具有高分辨率、多波段成像、形成3对立体像对的能力以及能直接获取数字影像等特点而备受摄影测量界的关注。文中简要介绍了ADS40相机的系统构成及其性能、优势，探讨了其产品的摄影测量处理过程，并对其应用前景进行了展望。     

数字相机畸变差的检测

通过分析数字相机的结构和误差来源,提出对数字相机畸变差检测的严密数学模型,并运用序贯方法解算该数学模型.实验证明采用本方法进行数字相机的畸变差检测简便易行,且通过对实验结果的分析得出一些有参考价值的结论.     

数码相机实施摄像测量的几个问题

提出像方几何量均取像素为单位处理，以直接使用现有摄影测量程序并使检校过程简化，给出α值的检校要求关系式，罗列主距的锁定方式，总结数码相机所摄影像的多种处理方法并充分利用数码相机功能。     

云台1m镜PI1024TKBCCDUBVRI测光系统

给出了云南天文台１ｍ望远镜ＰＩ１０２４ＴＫＢＣＣＤＵＢＶＲＩ测光系统的光谱响应曲线、中心波长和半宽,并同国际标准系统作了比较     

GPS辅助光束法平差中系统偏移的处理

介绍了在ＧＰＳ辅助光束法区域网平差中处理空间偏移的原理和算法，并用太原航摄机综合性能试验场实际ＧＰＳ航摄飞行资料验证了方法的正确性和有效性。     

Measuring Flume Surfaces for Hydraulics Research Using a Kodak DCS460

A critical problem in hydraulics research is accurate measurement of fluvially worked sediments, both in the field and in scaled representations of field situations in laboratory flumes. Such measurement must provide information on individual grain characteristics, and their organisation into structures referred to as bedforms. Existing measurement approaches are based upon mechanical or laser profiling devices, which are both expensive and take considerable time to acquire data, particularly where information is required at very high densities. This paper demonstrates how conventional automated terrain model extraction software, combined with image acquisition using a Kodak DCS460 digital camera, has been effective in generating digital elevation models of complex bed morphology. This has reduced time spent collecting data in the flume and has allowed data collection at much higher spatial and temporal densities. Application of the method is illustrated by research carried out at Hydraulics Research Wallingford. Issues discussed include configuration of photographs and control coordinates; appropriate camera calibration methods; stability of inner orientation of the Kodak DCS460; and accuracies obtained. Comparisons with independent check data reveal that accuracies of ±2.5mm have been achieved using a camera-to-object distance of 4.2 m.