从规则高程格网中自动提取等高线是地理信息系统以及计算机制图的基本功能。
The extraction of contour lines from Grid DEM is a primary function in computer-aided cartography and GIS.
在遥感与GIS技术的基础上，应用数字高程模型(DEM)生成的格网模型进行洪水的淹没分析。
Based on remote sensing technology the GIS grid model generated by digital elevation model (DEM) is utilized to analyze the flood submergence.
论述了一种基于大规模格网数据或离散高程点动态构建多分辨率地形模型的算法。
This paper presents a dynamic construction algorithm for the multi-resolution terrain model based on the large scale GRID data or discrete elevation data.
数字高程模型(DEM)是一定区域范围内规则格网点的平面坐标及其高程的数据集或者是经、纬度和海拔高度的数据集。
DEM (Digital elevation Model) is a data set of plane coordinate or longitude, latitude, and elevation of the regular square grid points in some region.
对于采用本方法计算淹没区，准确性受地形图等高距大小、数字化采集精度、数字地面模型（DEM）高程精度以及格网间隔大小、像素探测分辨率等因素的影响。
The accuracy of flood area is mostly dependent on the contour interval of map, accuracy of digitizing map, accuracy of DEM, and interval of GRID, detecting resolution of pixels.
结合数字高程模型的特点，对土石方工程量格网法计算方法进行改进。
Combined with the digital elevation model characteristics, this paper improves the grid method that is used to calculate earth-rock volume.
基于规则数字高程模型格网的峡谷检测是地形特征分析的重要手段。
Valley extraction based on a regular DEM grid is an important method for terrain analyzing.
本文主要对大规模地形数据(基于规则格网数字高程模型)的组织与可视化进行研究。
In this paper, study on organization and visualization of the massive terrain dataset mainly on Regular Square Grid data format are discussed.
本文主要对大规模地形数据(基于规则格网数字高程模型)的组织与可视化进行研究。
In this paper, study on organization and visualization of the massive terrain dataset mainly on Regular Square Grid data format are discussed.
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