共查询到20条相似文献，搜索用时 78 毫秒
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以变形观测点的平均高程作为研究对象,对连云变电所地面沉降规律进行研究.在沉降区域内较均匀地布设一些能反映地面沉降情况的观测点,定期对其进行沉降观测,求得每期观测点的高程值.选用Gompertz曲线模型和Logistic曲线模型进行拟合,建立预测模型,对研究对象进行预测并进行精度评定.通过研究发现,该方法能较好地反映地面整体沉降情况,可以作为研究地面沉降的方法之一. 相似文献
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基于GPRS/GPS/GIS的车辆导航与监控系统 总被引：53，自引：3，他引：50
引入一种基于GPRS/GPS/GIS的车辆导航监控系统,系统具有车上进行自主导航,车下进行监控的特点.系统采用GPRS作为通信手段,不但减少运营费用,而且方便用户直接参与.对车辆导航监控系统的组成、关键技术进行阐述,最后对系统的实现情况进行介绍. 相似文献
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对基于LIDAR数据的建筑物重建进行研究,提出了一种自动化的建筑物重建方法.根据建筑物的边缘线通常互相垂直或平行这一特点对提取的轮廓线进行规则化.然后在屋顶三角网中随机选取种子三角形进行区域生长,将屋顶分割成不同的平面,通过平面相交得到建筑物的屋脊线.最后通过搜索离建筑物轮廓点最近的LIDAR点云,将搜索到的LIDAR点云高程值赋给该轮廓点.实验结果表明:利用该方法进行建筑物重建具有较高的精度. 相似文献
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历史航片元数据录入建库工作就是将航摄像片进行扫描,对像主,占'进行判读,再进行航片元数据录入,对文档资料进行扫描制作.本文对该项目的工艺流程及质量控制进行论述,对实际生产工作具有指导意义. 相似文献
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基于信息损失的街道渐进式选取方法 总被引：2，自引：0，他引：2
对街道网的量测信息、拓扑信息和专题信息进行了计算,在此基础上提出了一种基于信息损失的街道选取方法.按照该方法对GB 12343-90中的一幅街区式居民地地图进行了实验.结果表明,该方法能够动态和渐进地进行街道选取. 相似文献
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研究了采用水上拍摄方式,对水下近景摄影测量进行精密测量的理论模型.首先对已有的两种理论模型在实际应用中存在的局限性进行了分析,推导了界面法构像方程模型,并设计了相应测量方案.对水下天线进行测量试验,获得了±0.9 mm的测量精度.从而验证了界面法构像方程模型的实用效果. 相似文献
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Positions and proper motions obtained from observations by the very large array (VLA) and the multi-element radio-linked interferometer
network (MERLIN) are used to establish the link of the Hipparcos Celestial Reference Frame (HCRF) to the International Celestial
Reference Frame (ICRF). The VLA and MERLIN data are apparently the latest ones published in the literature. Their mean epoch
at around 2001 is about 10 years after the epoch of the Hipparcos catalogue and, therefore, the data are considered suitable
to check the Hipparcos link established at epoch 1991.25. The parameters of the link, i.e., the angles of frame orientation
and the angular rates of frame rotation, are estimated by fitting these parameters to the differences of the optical and radio
positions and proper motions of stars common to the Hipparcos catalogue and the VLA and MERLIN data. Both the estimates of
the angles of orientation and the angular rates of rotation show nearly consistent but insignificant results for all samples
of stars treated. We conclude that not only the size of the samples of 9–15 stars is too small, but also that the accuracy
of the radio positions and, above all, of the radio proper motions is insufficient, the latter being based on early-epoch
star positions of low accuracy. The present observational data at epoch 2001 suggest that maintenance of the Hipparcos frame
is not feasible at this stage. 相似文献
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Anko Brner Lorenz Wiest Peter Keller Ralf Reulke Rolf Richter Michael Schaepman Daniel Schlpfer 《ISPRS Journal of Photogrammetry and Remote Sensing》2001,55(5-6)
The consistent end-to-end simulation of airborne and spaceborne earth remote sensing systems is an important task, and sometimes the only way for the adaptation and optimisation of a sensor and its observation conditions, the choice and test of algorithms for data processing, error estimation and the evaluation of the capabilities of the whole sensor system.The presented software simulator SENSOR (Software Environment for the Simulation of Optical Remote sensing systems) includes a full model of the sensor hardware, the observed scene, and the atmosphere in between. The simulator consists of three parts. The first part describes the geometrical relations between scene, sun, and the remote sensing system using a ray-tracing algorithm. The second part of the simulation environment considers the radiometry. It calculates the at-sensor radiance using a pre-calculated multidimensional lookup-table taking the atmospheric influence on the radiation into account. The third part consists of an optical and an electronic sensor model for the generation of digital images. Using SENSOR for an optimisation requires the additional application of task-specific data processing algorithms.The principle of the end-to-end-simulation approach is explained, all relevant concepts of SENSOR are discussed, and first examples of its use are given. The verification of SENSOR is demonstrated. This work is closely related to the Airborne PRISM Experiment (APEX), an airborne imaging spectrometer funded by the European Space Agency. 相似文献
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DanteSalvini 《地球空间信息科学学报》2002,5(1):18-21
One type of aerial cableway consists of a continuous cable,which works at the same time as carrying cable and drawing cable.This kind of cableway is supported by many towers,which divide the total length in linear sections.even small deviations from the planed layout can increase the strain of the cable and the danger of derailments.The deviations of the position of the towers from the planed layout are due to local sliding or sinking of the foundation or other mechanical movements.Up to now the axis of the cableways were periodically measured by traditional methods. The goal of this project is to demonstrate the possibility of measuring the axis of a cableway with GPS techniques,while the cable is moving.The results show that the proposed measuring device provides precise results in a simple and reliable way. 相似文献
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This paper provides a review of ground-based SAR (GBSAR) interferometry for deformation measurement. In the first part of the paper the fundamentals of this technique are provided. Then the main data processing and analysis stages needed to estimate deformations starting from the GBSAR observations are described. This section introduces the two types of GBSAR acquisition modes, i.e., continuous and discontinuous GBSAR, and reviews the different GBSAR processing and analysis methods published in the literature. This is followed by a discussion of the specific technical aspects of GBSAR deformation measurement. A section then summarizes the pros and cons of GBSAR for deformation monitoring. The last part of the paper includes two reviews: one concerning the GBSAR systems described in the literature, including non-strictly SAR systems and a second one addresses the main GBSAR applications. 相似文献
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The monitoring of different crops (cultivated plots) and types of surface (bare soils, etc.) is a crucial economic and environmental issue for the management of resources and human activity. In this context, the objective of this study is to evaluate the contribution of multispectral satellite imagery (optical and radar) to land use and land cover classification.Object-oriented supervised classifications, based on a Random Forest algorithm, and majority zoning post-processing are used. This study emerges from the experiment on multi-sensor crop monitoring (MCM'10, Baup et al., 2012) conducted in 2010 on a mixed farming area in the southwest of France, near Toulouse. This experiment enabled the regular and quasi-synchronous collection of multi-sensor satellite data and in situ observations, which are used in this study. 211 plots with contrasting characteristics (different slopes, soil types, aspects, farming practices, shapes and surface areas) were monitored to represent the variability of the study area. They can be grouped into four classes of land cover: 39 grassland areas, 100 plots of wheat, 13 plots of barley, 20 plots of rapeseed, and 2 classes of bare soil: 23 plots of small roughness and 16 plots of medium roughness. Satellite radar images in the X-, C- and L-bands (HH polarization) were acquired between 14 and 18 April 2010. Optical images delivered by Formosat-2 and corresponding field data were acquired on 14 April 2010.The results show that combining images acquired in the L-band (Alos) and the optical range (Formosat-2) improves the classification performance (overall accuracy = 0.85, kappa = 0.81) compared to the use of radar or optical data alone. The results obtained for the various types of land cover show performance levels and confusions related to the phenological stage of the species studied, with the geometry of the cover, the roughness states of the surfaces, etc. Performance is also related to the wavelength and penetration depth of the signal providing the images. Thus, the results show that the quality of the classification often increases with increasing wavelength of the images used. 相似文献
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以滑坡蠕变阶段坡体的蠕变会引起环境条件的改变，进而影响植被生长状况的野外考察客观现实为依据，提出一种间接监测滑坡变化的新方法。利用高分辨率光学遥感技术，对滑坡蠕变阶段遥感影像上坡体上覆植被的异常特征进行判识，建立遥感影像上植被异常与滑坡蠕变的关系，反映滑坡的演化过程，弥补GPS技术、InSAR技术及部分地面监测手段在地势高、地形陡峭、植被茂盛等条件下监测工作的不足，为后续的滑坡预测研究提供帮助。以植被覆盖度较高的新磨村山体高位滑坡为例，首先，对研究区域进行分区；其次，计算各分区的植被覆盖度；最后，利用植被覆盖度分析遥感影像上的植被异常与滑坡蠕变的关系，并根据滑后遥感影像和实地考察情况进行验证。结果显示，2014年—2016年，滑坡的主要物源区、变形体上方细长局部崩滑区和泉眼及冲沟周边的植被覆盖度出现明显的下降，即随着滑坡发生时间的临近，植被受滑坡蠕变的影响变大，植被生长状况变差；而且随着距裸地等滑坡风险较大区域的距离增大，植被受滑坡蠕变的影响变小，植被生长状况变好。这表明，植被异常与滑坡蠕变存在明显的时空相关性，体现了滑坡蠕变阶段遥感影像上植被异常与滑坡蠕变的内在联系，反映了滑坡逐步失稳的演化过程，为进一步预测滑坡的发生提供依据。 相似文献
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随着城市面貌日新月异,地下管网的建设也在持续推进,作为城市的地下“神经网络”,全天24 h保障城市的正常运转和发展。本文以实现城市管网管理系统的高可用、无插件、智能化为目标,采用“地上地下一体”“二三维一体”的设计理念,研究基于WebGL的三维智慧管网系统的关键技术,实现了管线设施管理的信息数字化、空间化与图形化。 相似文献
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随着移动定位、移动GIS与物联网等技术的不断发展,动态交通信息的服务能力和服务水平不断提升,对数据管理效率提出了更高要求。本文将本体应用到交通GIS中,借助本体概念层次结构和语义扩展等特性来组织和分析动态交通数据：首先应用本体论的理论和方法,从交通本体的层次模型出发,构建一个简单的交通应用本体;其次以实例的形式给出交通信息本体的系统应用框架;最终就动态交通信息本体实现与应用进行进一步论述。大量实测的试验数据结果表明,本文方法可解决交通信息领域中的多专题动态信息综合管理问题,促进交通信息管理与服务的提升。 相似文献
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GridGNSS--网格化全球卫星导航系统 总被引：3，自引：0，他引：3
计算机网络技术的发展已经使全球的信息资源实现网络互联和页面浏览,新一代的基于IPv6的IP地址方案的实施,将可以满足全球几乎任意的资源连接互联网的需要。随着移动通讯技术的发展,移动互联网和移动IP技术可以使移动用户通过网络实现全球资源的互联和访问。因此,对于通过全球卫星定位系统进行移动目标定位的用户,可以通过移动网络的方式实现传统的数据传输和通讯。随着新一代互联网络的的发展,WebService成为全球信息发布的最主要的平台,基于WebService的GNSS综合信息发布可以实现全球GNSS资源和信息的访问,计算机网格的出现为全球GNSS计算提供技术支持,本文基于网格技术,提出了GNSS网格和GridGNSS的概念,对GridGNSS的功能和研究内容进行了详细分析,并对GridGNSS的实现过程和应用进行了阐述。 相似文献
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根据系统空间数据结构的特点 ,提出了图块_实体数据模型 ,有效地解决了对空间信息操作的复杂性 ,有利于施工中空间数据的动态更新和维护。该系统的空间数据结构为相关信息系统建立适宜的空间数据结构提供了一条可行的途径。 相似文献