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.
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.
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.
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.
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).
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).
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