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中国测绘学会工程测量专业委员会，于一九八一年四月十日至十六日在长沙召开了城市及建筑工程测量学术会议。参加会议的代表共178人，会议收到学术论文160篇。会议采取大会报告、专业组报告与讨论相结合的方式进行。会议分五个专业组：城市控制测量组；摄影、地形测量组；建筑工程测量组，电磁波测矩测量组；误差理论与平差计算组。这次会议贯彻了“百花齐放、百家争鸣”的方针，发扬了学术民主，广泛地交流了经验，取得了较好的效果。例如： 相似文献
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根据相关平差理论，指导出两组相关观测值的逐次间接平差数学模型，提出改化第二组误差方程来消除两组间的相关性。文章给出了多组相关观测值误差方程的改化算法，并根据ＧＰＳ载波相位观测值协方差阵的特殊性，给出了改化三差误差方程的算法。 相似文献
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在新疆，如今提起“358”这组数字，大多数的百姓可能还很陌生。可对国土资源部门来说，这是一组吉祥的数字。它凝聚着中央对促进新疆经济发展的亲切关怀和期待，是国土资源部与自治区政府合奏起的推进新疆地质找矿实现重大突破的主旋律，是广大地质工作者心底飞出的一首歌。“三年要有好的眉目，五年要有鼓舞人心的成果，八年要有令国人为之振奋的重大成效。”“358”，这是一组令人心潮澎湃、热血沸腾的数字。它为新疆实现地质找矿重大突破，找大矿找好矿，实施优势资源转换战略， 相似文献
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本文在跨断层多期复测整体平差基础上分析了一期数据对最小二乘结果之影响，探讨了跨断层监测中异常数据发现问题，平差模型可以视为一种模型，其编差除了来自模型假设与实际不符之外，还可能是由于数据中成员的影响不均造成的。文章研究了某组数据对平差结果的影响，如果某组数据影响过大，则包含这组数据与不包含这组数据对所作的统计推断就会出现明显差异，于是造成人们对这个模型的不信任感，跨断层监测数据是断层活动的客观反映 相似文献
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群山逶迤，测旗飘扬，一支农民测绘队伍，战斗在北京市延庆县白河引水工地上。这个测量组共六十五人（其中女同志十八人），都是人民公社社员。一九七○年建组以来，在县委和 相似文献
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分别利用多通道Gabor滤波器和马尔可夫随机场模型对纹理图像进行分析，得到两组特征影像。将上述两组特征影像进行融合，最后利用融合后的数据实现图像的分类。实验证明，基于上述方法的纹理特征融合分类算法大大提高了图像的分类精度。 相似文献
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用切贝谢夫配点法消除地球自振常微分方程组在地… 总被引：1，自引：1，他引：1
用切贝谢夫配点法求解地球自振常微分方程组，无需进一步改化即可消除这组方程在地心处的奇异性，并能获得高精度的结果。 相似文献
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在毛主席的革命路线指引下，在批林整风和批林批孔运动的推动下，合肥工业大学建筑系测量组坚持开门办学，把教学、科研、生产紧密结合起来，采用多种形式积极为工农业生产服务。这个组有教师6名。工人1名、实验室工作人员2名，在完成建筑、地质类四个专 相似文献
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何宗宜 《解放军测绘研究所学报》2001,21(3):47-53
本文详细地介绍了《深圳市地图集》普通图组的设计原理和编制方法。首重论述了序图组各图幅的设计与编制，区图、镇图的设计与编制，城区说图的设计与编制，制作普通地图的技术路线设计。 相似文献
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Adam P. Freedman 《Journal of Geodesy》1991,65(1):53-65
Summary A globally distributed network of high-precision receivers which obtain data from the full Global Positioning System (GPS) configuration of 18 or more satellites may soon become an efficient and economical method for the rapid determination of short-term variations in Earth orientation. A covariance analysis has been performed to evaluate the errors associated with GPS monitoring of Earth orientation. Earth orientation parameters were modeled either as constants over observing windows of various lengths, or as stochastic process-noise variables. The sensitivity of Earth orientation estimates to systematic errors in selected model parameters was also examined. GPS measurements appear to be highly competitive with those from other techniques, and have the potential to generate nearly continuous centimeter-level Earth orientation information to aid both spacecraft navigation and the study of high-frequency Earth orientation-related processes. 相似文献
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极区基于地球第二近似椭球模型横向坐标系编排复杂,编排本身存在原理性误差,而地球第一近似球体模型虽然存在几何误差,但在极区惯导编排简单,且相对于中低纬度地区,第一近似几何误差较小。惯导极区编排地球模型的选用问题随着极区惯导的深入研究逐渐凸显。针对这一问题,在定义适用于极区的地球近似模型的基础上,推导建立了基于地球第一近似模型几何误差引起的惯导系统误差方程,通过仿真分析对比地球近似模型的惯导误差,分析地球近似模型的适用性。仿真结果表明,地球第一近似模型几何误差会随惯导运行时间发散,而第二近似模型的编排误差随时间变化不大,当惯导运行时间长则地球第一近似模型不再适用。 相似文献
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H. Fan 《Journal of Geodesy》1998,72(9):511-515
Historically, the mean Earth ellipsoid is obtained by fitting an ellipsoid of revolution to the geoid. Such an ellipsoid,
however, does not necessarily best fit the physical surface of the Earth due to the existence of topography outside the geoid.
In this paper, we present a purely geometrically defined Earth ellipsoid that best fits the physical surface of the Earth
so that the resulting ellipsoidal height attains minimum global mean square value. Using a global digital terrain model and
a global geopotential model, the size, shape and position of such an Earth ellipsoid have been numerically estimated.
Received: 6 September 1996 / Accepted: 1 April 1998 相似文献
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浅谈GoogleEarth二次开发技术 总被引：2，自引：0，他引：2
从GoogleEarthComAPI的发布谈起，回顾GoogleEarth的发展历史，介绍基于GoogleEarth为平台的二次开发技术，提供把GoogleEarth应用到现实生活中的思路。 相似文献
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The present study aims to extend the traditional rotation theory of the rotational-symmetric Earth to the triaxial Earth.We re-formulate the Liouville equations and their general solutions for the triaxial nonrigid Earth and find that the traditional theory intro-duces some theoretical errors in modeling the excitation functions.Furthermore,we apply that theory to the atmospheric excitation and find that theoretical errors should not be neglected given the present measurement accuracy.Thus we conclude that the traditional the-ory of the rotation of the rotational-symmetric Earth should be revised and upgraded to include the effects of the Earth’s triaxiality. 相似文献
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新一代数字地球平台与“数字中国”技术体系架构探讨 总被引：21，自引：0，他引：21
本文系统分析和总结了Google Earth的四大特点,及为地球科学研究、"数字地球"和"数字中国"的发展所带来的影响和启迪,提出了数字地球平台(DEP)的概念,并针对"数字中国"的建设,提出了建立"数字中国"的数据交换标准(DCML),提出了全新的以地学信息浏览器/空间信息服务器(G/S)结构为主的下一代数字地球、数字中国的技术体系架构,进一步对"数字中国"技术体系架构应遵循的原则进行了论述,对"数字中国"建设和应用服务进行了展望。 相似文献
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《International Journal of Digital Earth》2013,6(1):4-16
Abstract Digital Earth's framework can be traced to evolutionary threads with historic foundations that fostered the fertile conceptual and technological incubation. These threads incorporate writings, such as those of the visionary engineering-genius, Buckminster Fuller, in conjunction with an array of space age developments in computers, internet and communications, satellites, and education. In 1998, when Vice President Al Gore articulated the Digital Earth Vision, he portrayed the vision based upon myriad technology factors for the intellectual foundation and sparked a worldwide phenomenon that fortuitously included the Chinese leadership's recognition and acceptance. The Beijing Declaration is recognised for its role promulgating the International Digital Earth Symposium series to promote better understanding of the impacts of Digital Earth technology and applications on behalf of all humankind. Combinations of industrial, academic, and government organisations have advanced the technological components necessary for implementing the Digital Earth Vision at a prodigious rate. Commercial leaders, such as Google, have accelerated the influence of large segments of society towards components of the Digital Earth Vision. However, challenges still remain regarding requisite collaboration on international standards for metadata, interoperability, and data formats for space and time that will affect Digital Earth implementation scenarios. Functional requirements for the model Digital Earth geobrowser remain to be fully articulated. The current paper presents an overview of the historical components, the key players on the international scene, the catalytic technological advances, and the societal response to the growth of the Digital Earth community. 相似文献
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Cédric H David David J Gochis David R Maidment Wei Yu David N Yates Zong-Liang Yang 《Transactions in GIS》2009,13(4):363-377
The National Elevation, Hydrography and Land Cover datasets of the United States have been synthesized into a geospatial dataset called NHDPlus which is referenced to a spheroidal Earth, provides geospatial data layers for topography on 30 m rasters, and has vector coverages for catchments and river reaches. In this article, we examine the integration of NHDPlus with the Noah-distributed model. In order to retain compatibility with atmospheric models, Noah-distributed utilizes surface domain fields referenced to a spherical rather than spheroidal Earth in its computation of vertical land surface/atmosphere water and energy budgets (at coarse resolution) as well as horizontal cell-to-cell water routing across the land surface and through the shallow subsurface (at fine resolution). Two data-centric issues affecting the linkage between Noah-distributed and NHDPlus are examined: (1) the shape of the Earth; and (2) the linking of gridded landscape with a vector representation of the stream and river network. At mid-latitudes the errors due to projections between spherical and spheroidal representations of the Earth are significant. A catchment-based "pour point" technique is developed to link the raster and vector data to provide lateral inflow from the landscape to a one-dimensional river model. We conclude that, when Noah-distributed is run uncoupled to an atmospheric model, it is advantageous to implement Noah-distributed at the native spatial scale of the digital elevation data and the spheroidal Earth of the NHDPlus dataset rather than transforming the NHDPlus dataset to fit the coarser resolution and spherical Earth shape of the Noah-distributed model. 相似文献
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The Google Earth terrain model could prove beneficial for extraction of positional data in the future. At present, only an aging independent benchmark study (Potere, D., 2008. Horizontal position accuracy of Google Earth's high-resolution imagery archive. Sensors, 8, 7973–7981) provides constraints on positional accuracy for Google Earth imagery. In this investigation, we compared virtually traced positions against high-precision (<1 m) field measurements along three stratigraphic unconformity sub-sections in the Big Bend region to determine current positional accuracy for the Google Earth terrain model. A horizontal position accuracy of 2.64 m RMSEr was determined for the Google Earth terrain model with mean offset distance being 6.95 m. A vertical position accuracy of 1.63 m RMSEz with mean offset distance of 2.66 m was also calculated for the terrain model. Results suggest data extracted from the Google Earth terrain model could plausibly be used in future studies. However, we urge caution in using Google Earth data due to limited information disclosures by developers. 相似文献