共查询到19条相似文献，搜索用时 125 毫秒
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应用AutoCAD进行地形图的计算机辅助制图能极大地提高工作效率，但因其没有根据数字地形分析（DTM模型）自动产生等高线的功能，用VBA编程技术，将外业采集的离散点通过建立三角网，在三角形边上内插等高点的方式，能在AutoCAD中实现等高线的自动绘制。 相似文献
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文章介绍了用三角网络线性插值法绘制地形图等高线的新方法,即按地形特征点(线)划分片区,判断离散高程点的位置,按线性插值法确定等高线点的坐标,经追踪光滑,绘出等高线。该方法能高精度地逼真地反映地表实际形状。 相似文献
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基于DEM的青海贵德地区地形起伏度的研究 总被引：5，自引：0，他引：5
基于贵德地区1：5万地形图等高线数据内插生成的DEM数据,在ArcMap软件空间分析支持及Spss软件拟合曲线统计下,得到该地区地形起伏度提取的最佳窗口为400m×400m;基于400×400m2的分析窗口,提取贵德地区的地形起伏度,完成地形起伏度的专题图,统计分析高程与起伏度之间的相互关系,其结果与实际情况基本吻合。 相似文献
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MicroStation是一套可执行于多种软硬体平台的通用电脑辅助绘图及设计（CAD）软件。在MicroStation中,其制作的符号被保存在一个后缀为CEL符号库文件里,使用时只需正确连接符号库即可。使用MicroStation绘图时,SHARECELL功能为图形符号的替换带来方便。地形图主要使用GRAPHIC、POINTS两种符号类型,其可以通过层、颜色等属性来定义。符号制作时可依据国家标准地形图图示,设置大小及符号原点。设置合适的比例,库中符号则可绘制不同比例尺地形图。MicroStation的符号制作功能虽然灵活,但没有提供对符号要素的编辑功能是软件的一大缺陷。 相似文献
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Ninad Bodhankar 《Environmental Geology》2003,44(2):176-179
The Survey of India toposheet number 64 G/12 was used as a source of information pertaining to contours, urban features, drainage and lakes and surface water harvesting structures. The commercially available software Surfer was used in this study. Contours were digitized, on screen, from the scanned base map. These data were then interpolated to obtain intermediate contour lines. Using the contour data, a wireframe map was generated to visualize the topography and ground slope variation in three-dimension. Vectors are emplaced over contour and wireframe maps to evaluate the gradient variation in topography. It is evident that the ground slope facilitates the movement of surface water runoff, and is directly proportional. The vector map helps in emphasizing the correlation of ground slope and surface water flow for the topographic analysis of landform for the siting of surface water harvesting structures. Vector maps can be guiding tool for the construction of surface water runoff structures/traps for augmentation of artificial recharge. This is a very fast and reliable method to evaluate the utility of the proposed structure to be used for surface water harvesting before actual construction, and it can be of help to evaluate the suitability of the structure for its maximum utilization. 相似文献
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Samih B. Al Rawashdeh 《Arabian Journal of Geosciences》2013,6(12):4873-4880
The extraction of the water hydrographical pattern and watershed and subwatershed boundary is very important for many types of study. In Jordan the topographic map scale 1:25,000 produced at the Royal Jordanian Geographic Center is considered the most important source of contour lines and drainage pattern; therefore, it is imperative to estimate the accuracy of these types of data extracted from the previous topographic maps. In this project we aim to extract the hydrographical pattern of the Humrat Assahn basin in two methods: (1) an orthophoto based on aerial photographs using Socetset as photogrammetric software and (2) topographic maps at scale 1:25,000. A precise Digital Terrain Model (DTM) was built from stereoscopic aerial photographs using Socetset software. As we know, the quality of DTM is imperative to assure precise results and depends on the method of creation of this DTM besides other factors. A complete data base for the necessary information for achieving this objective was built. The obtained results were evaluated using GPS points and photo-interpretation. The results show that the drainage pattern extracted from DTM using photogrametric software was very accurate; meanwhile, the accuracy of the drainage pattern extracted from topographic maps has some flaws. 相似文献
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SURFER软件图形数据的进一步处理和利用 总被引：4，自引：6，他引：4
李绍荣 《物探化探计算技术》1997,19(2):174-180
ＳＵＲＦＥＲ软件可将原始数据网格化，自动生成等值线图形，使用方便，但它的图形编辑功能较弱，无中文标注功能，多图层操作功能方面也不能令人满意，为了弥补这些不足，需对其数据做进一步处理。本文讨论了ＳＵＲＦＥＲ软件数据的进一步处理和利用中的一些问题，作为例子，着重探讨ＳＵＲＦＥＲ软件与其它系统的接口 相似文献
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地形图数字化是获取矢量空间数据,建立GIS数据库的一项重要的基础工作,而地形图数字化的精度直接影响着GIS数据库的精度.地形图数字化的方式通常有两种,一是手扶跟踪数字化,另一种是扫描数字化.本文就扫描数字化的精度问题做以简单的探讨. 相似文献
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降雨在地表上随地形流动自然形成沟谷线、汇流区、分水岭等流域形态,研究地表流水线的数字模拟对数字流域水文分析具有重要意义.提出数字地表流线模型的概念,只考虑地形因素,利用等高线图建立一个能获得区域内每滴雨水沿地表流动的轨迹模型.并运用地图代数的距离变换对等高线及所在空间进行全方位的距离度量,研究了数字地表流线模型的建立方法.实验表明,该模型利用距离变换信息而不是高程计算流向,可避免DEM高程误差对流向、流线的影响,且不需要在DEM上进行复杂的洼地、平地的识别与处理.该模型对原始数据要求不高,能有效应用于沟谷线的自动提取、汇流区自动分割和分水线网络的自动提取. 相似文献
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在地质工作和测量程度低的地区开展地质调查工作时,由于缺乏基础资料,在工作设计及野外施工等方面极其不方便.本文利用91卫图助手软件免费下载工作区地形和影像数据,使用Global Mapper对该数据进行分析处理,并结合MapGIS软件能快速绘制出调查区的一系列基础图件如地形等值线图、测区沟系图、测区影像图等.在此基础上,使得测区的地质工作路线安排、化探沟系次生晕野外采集点布置更加方便,从而节约了成本,并提高了工作效率. 相似文献
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将SURFER软件应用到地下水位等值线图绘制中,并以希尼尔水库为例,研究采用不同插值方法下SURFER软件绘制等值线图的差异,提出了不同插值方法的适用范围。 相似文献
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Paul F. Czeglédy 《Mathematical Geology》1972,4(4):291-305
On the basis of samples taken from a known topographic surface, the parameters of two types of linear models are estimated. The first category is defined by polynomials or trigonometric functions, whose parameters are simultaneously computed from available data. In the second category a set of local centers is defined, and in the neighborhood of each center a fixed-degree polynomial is developed. An approximative resemblance index is calculated, and contour maps corresponding to various models are compared with the topographic map. It is found that with an increasing number of grid points, maps of local polynomials are converging both in continuity and in resemblance. For a sufficient number of grid points, this resemblance is always higher than those produced by models of the first category. 相似文献