Discussion on the process of plotting terrain map by digital scanning and its related problems;
介绍了工程地形图自动绘制系统实现过程中所采用的几个有效技术。
The soil erosion potential possibility can be studied using the soil background map and digital terrain map supported by GIS;
在GIS支持下，利用土壤背景和数字地形模型可实现水土流失潜在可能性分析。
In addition, a pipe network description language for water supply system is designed to locate pipe networks in city terrain map.
给出一个管网系统(供水)的管网图形描述语言，使管网系统能快速准确地定位于地形图上。
In this paper, the methods of drawing contour line from terrain map, the vector of contour line and generating elevation data from vector data are discussed.
论述了从地形图中提取等高线、对等高线矢量化以及通过矢量数据生成高程数据的实现方法。
This system can be used to accomplish both data acquisition and calculation to automatically output result data table, terrain map and cross section.
该系统能完成从野外数据采集到室内的数据计算、成果报表、平面图、断面图的自动打印输出。
By analysing error resulting from the process of terrain map by digital scanning, we studied the precision problem in this process and made this process much more reliable.
从扫描数字化的基本原理及实施过程出发，分析了基于大比例尺地形图的扫描数字化的误差来源，着重讨论了影响扫描数字化数据结果精度的主要原因及采取的措施。
By analysing error resulting from the process of terrain map by digital scanning, we studied the precision problem in this process and made this process much more reliable.
从扫描数字化的基本原理及实施过程出发，分析了基于大比例尺地形图的扫描数字化的误差来源，着重讨论了影响扫描数字化数据结果精度的主要原因及采取的措施。
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