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徕卡ADS 80数字航空相机采用POS/GPS精确导航定位技术进行航空摄影,通过对GPS差分数据进行常规布设控制点、少量布设控制点甚至无控制点的内业空三解算结果的对比分析,探讨外业像片控制点的布设方案对IMU/DGPS辅助航空摄影测量加密精度的影响,利用不同地形类别的加密数据,分析在保证成图精度的情况下如何减少外业工作量,降低生产成本,缩短生产周期。 相似文献
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大比例尺彩红外影象图、影象线划图信息丰富、宏观性强、有利于目视判读,特别在专业应用中,较之黑白图象准确、经济、节约人力,可减少大量外业工作。然而,彩红外大比例尺航摄成图控制加密精度如何?彩红外影象线划图精度及市场效果又怎样? 相似文献
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主要探讨了Pleiades卫星遥感影像在1∶10 000基础测绘实际生产中的应用。重点阐述了利用该卫星遥感影像在像控点布设、外业施测、空三加密所取得的结果及通过外业实测地物点检查DOM并进行精度分析。 相似文献
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航测外业控制测量是为内业加密、测图提供准确、完整、清晰的像片控制点成图资料,以保证成图的质量。但是每个像对都要在野外测求四地面控制点,造成外业工作量太大,效率不高。根据像控点的布设要求和其他有关规定,通过对外业布点方案的分析、计算,在满足内业测图精度的情况下,调整外业布点方案,大量减少外业控制测量的工作量,保证内业在加密作业时可以求得测图所需的全部绝对定向或对点纠正所需的控制点的平面位置和高程。 相似文献
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POS(DGPS/IMU)技术能够获取航摄瞬间航片外方位元素,采用POS技术进行空三加密和DLG制作,能够节省大量的外业控制点,这对提高航测地形图生产效率,降低成本具有重要意义。本文主要研究POS技术在平原地区1:10 000地形图生产中的外业控制点布设。设计了二十三种外业控制点布设方案,采用集成传感器定向法进行空三加密试验,在实验结果的基础上选择精度符合要求的数据制作了一幅1:10 000DLG,并对其进行精度测试。通过试验和研究,提出了合适的外业控制点布设方案,为POS技术应用于大规模航测4D产品生产做好技术准备。 相似文献
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介绍基于ImageStation自动空三模块以及福建CORS进行内业加密与外业像控生产技术流程改进的基本原则与关键环节,总结出利用新的技术手段提高空三加密的精度和效率的一些经验和体会。 相似文献
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航测外业控制测量是为内业加密、测图提供准确、完整、清晰的像片控制点成图资料,以保证成图质量。那么改变加密点的位置与数量,对成图的精度又有怎样的影响呢?这些正是本篇论文将要研究的问题。 相似文献
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根据傅科第一类回转仪的设想模型,本文用分析力学的方法研究了单自由度陀螺寻北仪的定向原理,分析了陀螺轴的运动规律,建立了多种因素如陀螺力矩,常阻尼力矩和空气阻尼等影响下的运动微分方程,分别求出对应解,并用小扰动理论研究了稳定性。 相似文献
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为了在西部大开发中更好地为四川的经济的发展提供测绘保障,四川省测绘局决定重新编制《四川省地图集》。本文从几个方面探讨了新版《四川省地图集》的编制,主要包括编制背景,如何选择使用现势性资料,出版方式,装帧设计,结构设计,重点探讨了各图组内容表示的设计。 相似文献
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《测量评论》2013,45(18):241-242
AbstractIn working out vertical heights on the Akuse-Kete Krachi chain of triangulation in the Gold Coast a fairly considerable difference was found between values of the coefficient of refraction obtained from observations taken during the day and those taken at night, the mean values being 0.069 for daylight observations to heliographs and 0.087 for night observations to lamps. This difference no doubt is due mainly to the condition of the atmosphere during the day differing from its condition during the night rather than to any effect due to different sources of light. A new chain has recently been observed in Western Ashanti, and the index of refraction for the daylight observations again gave a lower value than that obtained from the night observations, the figures being 0.073 and 0.099 respectively. For the night work three different sources of light were used, hurricane lamps for short lines, Tilley vapour-pressure lamps for lines of intermediate length, and McCaw acetylene signalling lamps by Watts for long lines. It occurred, therefore, to the writer to examine the results to see if the mean values of the index of refraction showed any variations for the different light sources, since it seemed reasonable to suppose that the constitution of the light emitted from each source would be different and hence that the coefficient of refraction might vary. 相似文献
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Ye. V. Fadeyeva 《地理信息系统科学与遥感》2013,50(1):19-23
A method is proposed for the calculation, based on the Goudriaan model, of estimates of various combinations of spectral radiance coefficients Pi which are optimal for interpretation of soil color and moisture, vegetation cover density, above-ground reserves of phytomass, and color and orientation of phytoelements. These estimates correspond rather closely with actual measurements obtained from the field. Translated from: Vestnik Moskovskogo Universiteta, geografiya, 1986, No. 4, pp. 75-79. 相似文献
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本文对只在陀螺力矩作用下傅科第一类回转仪的运动规律进行了扰动级数分析,推导了其运动周期公式,并与其线性解进行了比较,同时用动能法分析了该系统的稳定性. 相似文献
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《测量评论》2013,45(38):480-481
AbstractIn a letter published in a recent issue of Nature, Prof. L. F. Bates and Mr J. C. Wilson, of University College, Nottingham, have described a new and novel method of determining the coefficient of thermal expansion of invar. Although this method is hardly likely to be applied to the measurement of the coefficient of expansion of long invar tapes, such as are used by surveyors, yet it is so novel and ingenious in itself that a short reference to it may not be out of place in this Review. One extremely interesting thing about it is that no measurements of a length, or of changes of length, are involved. 相似文献