空间数据库主要包括数字高程图、土地利用图与土壤类型图。
Using the technique of GIS, the paper analyses the climate, hydrology, soil and land uses in the study area.
针对传统地形图缩编中高程点抽稀存在的问题，提出基于特征点的高程点抽稀的方法，使用此方法一方面可以保留特征点处的高程点，另外可以实现高程点的自动抽稀。
Aiming at the existed problem of sparsing elevation points in traditional topographic map generalization, this paper presented the sparsing method for elevation points based on feature points.
另外，建立了数字高程模型、数字克山病分布模型、数字硒模型并作剖面图分析，定量分析了地形与微量元素分布的宏观变化规律。
Otherwise, based on DEM, digital model of KSD distribution, digital Se model and profile-map analysis, the research has a quantitative analysis of macro change rule in microelement distribution.
基于地球同步卫星定位原理，分析了当利用数字化地形图提供测站高程时测站的多解和无解现象。
According to the Earth synchronous satellite positioning principle, multi-results and non-results are analyzed when the station height is given using DEM.
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.
给出了一种同时利用数字高程模型和正射图的精确后向散射建模方法，并由此得到了三幅具有不同地形特征的SAR实时图。
A precise backscatter modeling method using digital elevation model and orthography is proposed, and three SAR real-time images with different terrains are simulated based on it.
针对传统地形图缩编中高程点抽稀存在的问题，提出基于特征点的高程点抽稀的方法，使用此方法一方面可以保留特征点处的高程点，另外可以实现高程点的自动抽稀。
In view of REM and height for suspending points, this paper points out the methods that solve practical problems, and provides the theory basis for the practical application.
网格图是通过网格点的不同颜色表示不同高程的图形。对于网格点稠密的图形，用网格图可以表达出图形的全部特征。
Signifying different elevation with different color of grid nodes, grid picture can express all characteristic of terrain in density grid.
本图所采用地形图是由华东院提供1：2000、6度带地方坐标高程系地形图。
Relief map employed by the drawing is1:20006degrees elevation relief map with local coordinates and provided by hydrochina. huadong engineering corporation.
为了测图的需要，所有由仪器测定的散列高程点，均可列入高程点这一名称。
For mapping purposes all scattered heights fixed by instrument may be grouped under this heading.
收集的地理实况数据包括1：5万的地形图和根据该地形图经数字化处理生成的数字高程模型(dem)。
The collected ground true data includes topography map with scale of 1:50 000 and the corresponding Digital Elevation Model (DEM).
通过对水利损失的计算，确定了各构筑物的高程，为绘制高程布置图和平面布置图提供了依据。
The loss of water through the calculation to determine the elevation of the structures for mapping elevation layout maps and graphic layout plan provided basis.
通过对水利损失的计算，确定了各构筑物的高程，为绘制高程布置图和平面布置图提供了依据。
The loss of water through the calculation to determine the elevation of the structures for mapping elevation layout maps and graphic layout plan provided basis.
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