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用勘探线剖面图结合钻井与其他资料进行地质模型三维重建是三维地质建模的重要方法。其中勘探线剖面图从二维坐标系向三维坐标系的转换是三维建模的一个重要环节。针对当前勘探线剖面坐标转换过程中勘探线上钻孔并不总是布置在一条直线上(弯折勘探线)的特点,该文提出了一种构建弯折三维剖面的方法。该方法首先由剖面线的起点、终点以及勘探线上钻孔孔口点作为转折点构建三维折勘探线剖面框架;然后将二维剖面图上分段转换剖面上要素点的二维坐标到三维空间,并对跨越剖面转折点的长边添加转折控制点;最后以青海某煤田勘探区的二维勘探线剖面图数据为例,利用该勘探线剖面坐标转换算法,实现了二维勘探线剖面图到三维勘探线剖面图的转化,结果表明三维剖面上保持了原二维剖面所表达的地质模型的几何形态。 相似文献
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探讨了基于Excel与南方CASS软件的勘探线设计剖面图的自动生成原理,并详细介绍了"Excel剖面图数据处理模板"的使用方法。 相似文献
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研究利用ArcGIS Server构建的WebGIS体系结构及其内部运行机制,在详细介绍基于ASP.NETAJAX的Web ADF开发框架的基础上,结合地下管线剖面图动态生成的开发实例,给出基于ArcGIS Server的WebGIS系统中实现地理空间分析功能的具体方法,对WebGIS系统中实现复杂地理空间分析有一定的指导意义。 相似文献
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滑坡体地质剖面表达与绘制方法探讨 总被引:2,自引:0,他引:2
滑坡体的地质结构非常复杂,对如何有效地表示滑坡体内部结构采用计算机绘制其剖面图的研究具有很强的实用性。本文对采用数字高程模型(DEM)在计算机上绘制滑坡体地质剖面图进行了论述。 相似文献
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3维数据的获取一直是地体可视化的难点,而2维的剖面生成器的数据采集、存储、管理以及可视化表达可以为3维数据的快速获取提供解决方案。本文给出了基于知识的剖面器开发方法,研究了剖面图的数据模型,给出了知识获取方法,并给出了剖面图生成实例。 相似文献
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传统剖面图坐标方里网的展绘,基本采用坐标改算法;角距平行线法以及薄膜套制法三种。坐标改算法虽思路严密,但计算工作量大且不适合薄膜图方里网投影纵线的数字化处理,影响成图精度。剖面图坐标方里网的展绘常采用角距平行线法,它灵活方便,计算简便。 相似文献
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利用剖面图进行地质体建模因其复杂度很高,常常是利用CAD或类似的地质建模软件进行交互式的建模,因此非常耗时。本文以大坝地质平切图(剖面图的一种)为数据源,开发了一种"多段连接"的方法可以自动构建地质体的三维表面模型,以及一种"三次搜索法"用于模型剖切分析,并在实际项目中验证了本文方案的有效性。 相似文献
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从高斯光束经过光学系统的传输与变换规律出发,借助于高斯括号的性质,研究了激光束光学系统的变焦特性,导出了机械补偿式激光束变焦系统的变焦方程及补偿点位置方程,并给出了计算实例。 相似文献
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《制图学和地理信息科学》2013,40(1):48-60
The growth of web-based mapping is transforming geovisualization. Use of web mapping has become ubiquitous throughout much of the world and has sparked greater public interest in GIS and mapping. Despite the rapid growth of web mapping, there has been relatively little study of the design and usability of web maps. Moreover, the design and function of popular web mapping programs are sometimes at odds with standard GIS and cartographic practices for even the simplest of functions such as zooming into a feature of interest. This study advances understanding of web mapping design via web usability testing based on mouse metrics and eye tracking technology to assess the utility of four different web map navigation schemes: pan zoom; double clicking; zoom by rectangle; and wheel zoom. We found significant differences among the various interfaces, with marked preference for the standard GIS approach of rectangle zoom, followed closely by wheel zoom. Far fewer users preferred the web mapping standard of pan zoom or click zoom. In addition to finding significant differences in usability among these approaches, this work illustrates the broader utility of usability testing and eye tracking technology for creating a better web mapping experience for users. 相似文献
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建立了光学转像变倍微分方程,并应用于军械瞄准具无焦系统连续变倍过程的分析,给出两个数字例子的高斯光学设计结果 相似文献
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Tomasz Opach J. Korycka-Skorupa I. Karsznia T. Nowacki I. Gołębiowska J. K. Rød 《制图学和地理信息科学》2013,40(4):347-367
ABSTRACTProportional point symbols are commonly used in map displays. However, when such displays are zoomed out, the available map space shrinks and consequently symbols overlap and the display suffers from visual clutter. Therefore, solutions are needed to reduce visual clutter in zoomable map displays that contain proportional point symbols. The authors add to the body of knowledge through the investigation of the performance of three solutions: aggregation of unit areas, the displacement of overlapping symbols, and modified symbolization; four variations of modified symbolization are examined in detail. The original study begins with a consideration of the strengths and weaknesses of the solutions, with an emphasis on information loss. Thereafter, user sessions with 165 participants are arranged to gain empirical evidence of the performance of the solutions. The results reveal that although participants zoom out the map to zoom levels that implement visual clutter reduction techniques, they tend to zoom in the map and pan it to examine specific areas. Moreover, they willingly use the map with aggregated unit areas in cases when the solution facilitates task accomplishment. A certain amount of skepticism attaches to the solution that displaces overlapping symbols. 相似文献
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基于ArcEngine的基础地理信息系统的设计与实现 总被引:2,自引:1,他引:1
介绍了利用ArcEngine技术开发基础GIS软件的特点,重点讨论了在GIS软件中查询功能、缓冲区功能和注记随地图缩放功能的实现. 相似文献
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《The Cartographic journal》2013,50(4):292-303
AbstractThe presentation of graphics and maps on the Internet has led to the development of several new techniques. The use of dynamics and animations in maps has increased, and new types of applications are emerging frequently. Recently, several map providers on the web have introduced zooming in maps as an animated operation. In this paper, we look closer into how the animated zoom is perceived by participants in an experiment, and compare these observations with a corresponding test where the map scale is changed in more abrupt steps. The results indicate significant preference for the animated zoom. The experiment itself is carried out through the World Wide Web and all the participants made their contribution from their own computers. 相似文献
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第2代双正交小波的上升型构造及其应用 总被引:1,自引:1,他引:1
介绍了双正交小波分解的基本理论,并用数字滤波器的观点分析了双正交小波函数所满足的条件;讨论了双正交小波函数及滤波器的上升型构造方案,在此基础上从最简单的Haar小波基出发,通过上升型步骤构造出具有不同特性的第2代双正交小波数字滤波器;最后给出了基于第2代双正交小波变换的图像放大算法及实验结果。 相似文献