共查询到20条相似文献，搜索用时 78 毫秒
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本文对工业烟囱变形测定精度的规定、摄站选择应当考虑的几个原则、摄测四点法确定烟囱的倾斜分量、矢量法确定烟囱的最大倾斜方向、测定Y距所需的精度和如何精确计算Y距及烟囱半径、人工标志的布设和经纬仪定垂线等问题进行了分析研究。阐述了基本原理，指出了解决问题的方法，导出了相应的计算公式，并得出了相关的结构。 相似文献
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《测绘与空间地理信息》2020,(8)
针对工厂中大型烟囱的水平截面为圆形的特点,本文提出了一种基于间接平差法的垂直度监测方法。该方法是利用高精度的全站仪获取烟囱不同高度水平截面外边缘坐标,根据间接平差原理求解不同高度水平截面的圆心坐标,然后通过计算不同高度截面圆心坐标差,评判烟囱的垂直度。 相似文献
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厂区烟囱倾斜变形测量 总被引：1，自引：0，他引：1
结合兰州生物制药厂厂区烟囱倾斜变形测量的实例，阐述了对于塔式建筑物(如高层建筑、水塔、烟囱等)倾斜变形测量的观测方法、数据处理方法，得出了一些有益的结论。 相似文献
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烟囱倾斜变形观测的新方法及其应用 总被引：3，自引：0，他引：3
从测量实践中发现烟囱倾斜变形观测方法-前方交会法观测设计的不足,运用测量误差理论和高等数学极值原理,通过采用调整图形结构和改变测站位置的方法,找到烟囱倾斜变形观测的新方法.大角前方交会法(eA≈-eB)或小角前方交会法(eA≈eB). 相似文献
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结合工业烟囱的形状特点,将烟囱虚拟为两个不同半径的同心圆柱,综合运用全站仪悬高测量功能和圆柱偏心测量功能,提出一种一次架设仪器解决工业烟囱高度测量的新方法,该方法不仅能减少外业工作量,减轻测量人员的外业工作强度,还能得到满足测量精度要求的数据,对实际工程测量有一定的指导意义。 相似文献
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水塔烟囱,拆除还是保留 留心北京城事的人们也许都还记得2005年那场拆与保的风波. 2005年8月,北京儿童医院开始拆除院内已废弃了三四年的烟囱.截止到9月13日,原高35米的烟囱已经被拆卸了三分之一.拆除工程引来多方侧目,马国馨、刘开济、王昌宁,刘力等多位资深建筑专家挺身站出,竭力主张保护和修复烟囱. 相似文献
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针对目前传统倾斜测量方法不能够全面反映建筑物倾斜变形的问题,提出一种新的基于逆向工程技术的倾斜观测方法,该方法能够较全面地反映建筑物各个部位的倾斜变形情况。基于烟囱倾斜测量的实验结果表明,所提方法不仅可以快速获取监测物体的三维点云数据,还能够准确计算出建筑物的重点监测部位。研究结果可应用于一般建筑物和塔形建筑物的倾斜观测。论文将逆向工程技术引入到倾斜测量领域中,可以更加全面、直观、形象地反映建筑物的倾斜情况。 相似文献
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V. K. Anand G. Venkataraman S. Vishwanathan G. S. K. Rao 《Journal of the Indian Society of Remote Sensing》1987,15(1):49-54
This paper deals with the processes operating on the beaches of Goa, interpreted from imagery, followed by ground-truth collection and field checks. Studies on Landsat imagery bring out two distinct coastal geomorphological features, one north and the other south of Vasco-da-Gama. The beaches to the south indicate the prograding shoreline with deposition being the dominant phenomenon. The beaches to the north of Vasco-da-Gama reveal a retrograding shoreline where erosion is dominant. The presence of chimneys and stacks to the north of Vasco-da-Gama are characteristic of intensive erosional action while to the south a wide regular beach backed by a palaeo-strand line points to deposition. The pattern of the sediment load (in Band 4) is used as an index of longshore current movement. The action of erosion as against that of deposition in the two regions can be surmised from the diffused pattern vis-a-vis the uniformly wide even tone. Sand samples from the northern portion give a sorting coefficient of 1.100 while the southern portion shows a value of 0.712. It is hypothesised that the promontory on which Vasco-da-Gama lies is responsible for the formation of two different geomorphic zones. 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