共查询到20条相似文献，搜索用时 140 毫秒
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应用Surfer增强ArcView的3维显示 总被引：5，自引：0，他引：5
简述ArcView和Surfer软件的各自3维功能，介绍以ArcView的高程点专题层为原始数据，应用ARC／INFO软件实现由ArcView数据格式向Surfer数据格式的转换，扩大ArcView数据的应用范围，增强其3维显示功能。 相似文献
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王枫 《测绘与空间地理信息》2008,31(1):152-154
由于ArcView提供的符号库难以满足各种专题地图的制作要求,影响了其图形输出性能的发挥。本文主要介绍ArcInfo中的线型符号制作方法及如何在ArcView中调用ArcInfo制作的线型符号,解决了ArcView制图中线型符号的配置问题。 相似文献
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由于ArcView提供的符号库难以满足各种专题地图的制作要求,影响了其图形输出性能的发挥。本文主要介绍ArcInfo中的线型符号制作方法及如何在ArcView中调用ArcInfo制作的线型符号,解决了ArcView制图中线型符号的配置问题。 相似文献
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ArcView GIS作为著名的地理信息系统软件，已经在许多领域得到广泛应用，本文重点对其空间面状数据的关系处理进行探讨。 相似文献
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本文评述了利用GIS软件ArcView制作县级土地利用规划图的步骤和方法,就制作中遇到的一些技术问题提出了相应的解决途径,并阐述了ArcView软件制作土地利作规划图的优点和不足。 相似文献
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在ArcView GIS中使用AutoCAD数据 总被引：8，自引：0，他引：8
随着地理信息系统的发展，GIS软件中不同格式的数据相互转化和应用更加频繁。系统用AutoCAD等平台录入的数据需要用ArcView进行处理构建系统。但不同系统的数据转换之间常常会丢失信息，如将CAD数据经过转换添加到ArcView视图中时会遇到要素重新分类，属性不可编辑，注记信息丢失等问题。介绍解决这些问题的一些处理方法和策略。 相似文献
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在ArcView中调用shape格式的文件时有时需要图形的显示是连续的、无缝的。利用ArcView的脚本语言avenue编写代码实现了图形漫游时的连续显示,自动载入与自动卸载。介绍了实现功能的基本思想与程序的具体实现过程。 相似文献
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ArcView平台下的襄樊GIS信息系统的设计与开发 总被引：4，自引：0，他引：4
湖北襄樊GIS信息系统以ArcView为基本平台,对从湖北省测绘局取得的地图、数据、分析结果、模型等进行集成,并应用ArcView所提供的AVENUE语言进行二次开发,设计并完成友好的用户界面,实现信息查询、数据库管理、图形编辑、制图、三维分析(模型)和输出的系统基本功能。重点介绍了系统开发的思路以及系统功能,给出了部分程序代码。 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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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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从系统总体设计原则、系统的总体结构设计、系统的功能模块组成、模块数据组成关系及各模块流程、开发平台的选择等几个方面探讨宗地与房产基底图入库发布系统的设计和开发。 相似文献
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随着全球导航卫星系统(GNSS)的发展,特别是Galileo和QZSS计划的提出,卫星导航领域提出了兼容与互操作的概念,并日益受到重视。增强与已有系统之间的兼容与互操作已经成为GNSS的一种发展趋势,因此,有必要对GNSS的兼容与互操作展开研究。在简述GNSS的兼容与互操作提出背景的基础上,分析了相应概念之间的区别和联系。基于GNSS兼容与互操作的3个关键因素,分别分析了兼容与互操作在空间信号、时间框架、大地坐标框架选取方面的应用体现以及产生的影响。最后提出了目前GNSS兼容与互操作研究可以展开的几个方向。 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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遥感数据成果的分级存储管理 总被引：1，自引：1，他引：0
本文在较为全面介绍分级存储技术的基础上,结合国家基础地理信息中心遥感数据存储管理的特点和用户需求,提出了详尽可行的分级存储应用方案,着重对数据迁移和回迁进行了讨论,并分析了方案特点。 相似文献
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气象模型GPT和GPT2均可用于获取测站的气压、气温等气象要素,对计算对流层延迟具有重要作用并在高精度的GPS数据分析中被广泛使用。GPT2对GPT模型精度的改进在很多文献中已经得到验证,但是目前没有相关文献对采用这两种模型获得的坐标时间序列的差异进行详尽的分析。本文分别利用气象模型GPT和GPT2处理相同的连续观测站数据,发现气压值偏差的季节性变化导致测站垂向位置偏差也产生季节性变化,是测站垂向位置“伪”年周变化信号的来源之一;同时,模型之间的气压值偏差对垂向位置的影响与测站纬度相关,表现为先验天顶延迟偏差传递进垂向位置偏差的比例随测站纬度增加而增大。 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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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