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《测量评论》2013,45(26):206-213
AbstractRELATIVE to discussions on the Wild theodolite in the E.S.R. the following contribution considers some properties common to that instrument and the Zeiss II; perhaps to the Tavistock also, with which, however, the writer has had no experience on precise triangulation. 相似文献
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电子经纬仪三坐标精密测量 总被引:3,自引:1,他引:3
与三坐标测量机相比,电子经纬仪三坐标测量法易于搬迁,且能无接触地测量大尺寸物件。但迄今为止,电子经纬仪三坐标测量法一直被认为精度太低而不能用于精密坐标测量,影响其精度的主要因素是电子经纬仪自身标定时的精度大低,为此,给出了一种新的自身标定方法,这种方法能很好地消除自身标定时的误差,且通过实验验证。 相似文献
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提高建筑物沉降观测精度的方法 总被引:2,自引:0,他引:2
提出了提高建筑物沉降观测精度的方法,分析了能有效地避免观测值的粗差、i角及i角变化的误差、前后视距不等和立尺不直带来的误差影响,提高了建筑物沉降观测精度. 相似文献
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A. D. Jones 《The Photogrammetric Record》1966,5(27):181-188
The paper traces the history of the Wild series of rectifiers, paying particular attention to the mechanical solutions of the Newton and Scheimpflug conditions. 相似文献
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论精密水准测量的误差传播,精度估计和质量控制 总被引:8,自引:1,他引:8
本文根据统计相关理论,在进行精密水准测量的误差传播和精度估计研究的基础上,探讨了全中误差的限差和质量控制问题。根据图形相关原理,给出了计算全中误差的无偏公式。 相似文献
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就影响全站仪水平方向测角精度的有关因素作了分析,并提出内业检测和外业测量尤其是高精度的仪器或高精度的测量都应重视的因素。 相似文献
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浅谈DEM的边缘精度对土石方工程计算的影响 总被引:4,自引:0,他引:4
本文介绍利用数字地面高程模型(Digital Elevation Model,简称DEM)计算土石方的方法,重点分析DEM的边缘精度对其计算结果的影响。 相似文献
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Site procedures, instrumentation, analytical methods and accuracies achieved are described for the measurement of the deformation of a military steel bridge under load in a test gantry. Some remarks concerning the advantages and disadvantages of photogrammetry as a method of industrial measurement are made. 相似文献
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关于GIS属性数据逻辑运算方法的精度问题 总被引:1,自引:1,他引:1
本文对GPS属性类别数据进行逻辑运算的误差问题进行了研究,并且针对逻辑运算的“逻辑交”,“逻辑并”和“逻辑补”等算法的误差传播和精度问题进行了分析。 相似文献
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《测量评论》2013,45(95):22-30
AbstractThe procedure for aerotriangulation on the Wild A5 and similar plotting instruments is well known. The first overlap is set up in absolute orientation on well spaced plan and height control and successive overlaps are set up relatively, each to the previous overlap, by eliminating want of correspondence and preserving the height agreement of points falling in the common portion of successive overlaps. When each overlap is correctly set, the co-ordinates of selected points are measured on the instrument (machine co-ordinates). These co-ordinates differ from true ground co-ordinates only in origin, azimuth and scale, provided the settings and measurements are precisely done on error-free models, precisely connected together. However, such ideal conditions are never obtained, and the errors in azimp.th, scale and height datum increase with the number of overlaps added along a strip. 相似文献
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本文研究ASHTECH LOCUS GPS接收机测边精度,同时给出一种检验其基线处理软件的有效方法。在不需要标准基线场的情况下这种方法不失为一种检测GPS接收机精度的好途径。 相似文献
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《测量评论》2013,45(12):335-340
AbstractFollowing recent discussions in the E.S.R. some experiences in Sarawak may be of interest.The argument for opaque beacons has been strengthened by the experience here of the past season, when combined day-and-night observing was carried out on the primary series, the daylight pointings being made to black-painted opaque beacons. No difference in the accuracy obtained by the two methods was noticeable in the results. Beacons were necessary in any case for the breaking down to secondary points. 相似文献
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IGS精密钟差精度分析 总被引:1,自引:0,他引:1
对比了IGS官方提供的5 min和30 s间隔的精密钟差变化规律,分析了利用8阶滑动式Lagrange多项式插值和线性插值将精密钟差内插至30 s间隔的精度及可行性,得出了一些国内文献未论及的结论。 相似文献