摘要
在近景摄影测量的全过程中 ,包括摄影机检校、实地控制测量以及摄影测量处理各阶段 ,其操作限差存在特殊的理论 ,系统说明这些理论并详尽推导了一系列相应的关系式。
Close_range photogrammetry is to determine the shape and size, of the object,in stead of it's absolute position.Therefore, at first, any translation and rotation of the photogrammetric model of the object caused by whole geodesic, photographic and photogrammetric procedures in close_range photogrammetry could not be considered,in other hand, it is necessary to analyze the all reasons which cause the deformations of the shape and size and to present their corresponding theories and equations. This situation, of course, is very different from the conventional topophotogrammetry. In this paper some specific charateristics of limit errors in close_range photogrammetry are presented in detail,including limit errors for calibration of interior elements for close_range cameras, the limit errors of relative and absolute orientations in close_range photogrammetric procedures, and the limit errors of control works in close range photogrammtry. A theoretical equation of calibration accuracy for close_range camera is given. Relating to 3 examples in this paper, their theoretical accuracy requirement of interior elements of camera change in the scope of ±(0.005～0.480)mm. This discussion permits us to reduce accuracy requirment in calibration for an object with small relief,but the camera platform was located in violent vibration environment. Another theoretical equations were also presented for control works in close_range photogrammetry, among them there is equation of relative RMS of base lines ( m S/S ), and the equation RMS of start direction. It was proved that the m S/S could be equal to the relative RMS of m Δ X / Δ X. It was proved as well that the permitting RMS of start direction is much bigger than the consistently using one. Some useful equations of limit errors in close range photogrammery were presented as well.Above mentioned suggestions are perhaps beneficial for increasing efficiency,for reducing production cost.
出处
《武汉测绘科技大学学报》
CSCD
2000年第6期542-547,共6页
Geomatics and Information Science of Wuhan University
关键词
近景摄影测量
尺寸
形状
绝对位置
限差
交向角
close_range photogrammetry
size
shape
absolute position
limit error
specific characteristic
