DEM digital elevation model

DEM ( Digital Elevation Model) is the most important basis of the Digital Earth model and other digital models. There are many methods to obtain it.

数字高程模型是数字地球技术和各种数字化模型的重要基础，目前已有多种DEM生成技术，以全数字摄影测量方法最具前途。

The Digital Elevation Model ( DEM) was obtained by vectorizing the topographic map.

对地形图进行矢量化，得到了哈尔滨市的数字高程模型（DEM）。

An information disguising and hiding technique is used to protect DEM ( digital elevation model) data for store and transformation in this paper.

提出了一种结合信息伪装和隐藏技术来保护数字高程模型（Digital elevation model，简称DEM）数据的方法，保证了DEM数据的安全传输和存储。

NOAA/ AVHRR and DEM ( Digital Elevation Model) together with the measured meteorological data are applied to modify Penman Formula. And the monthly potential evapotranspiration of Yarlung Tsangpo River Basin is calculated with the modified Penman Formula.

文中用NOAA数据、DEM数据结合实测气象数据对Penman公式进行修正，再用修正后的Penman公式计算雅鲁藏布江流域潜在蒸散量。

In this paper, the concept of SDTM ( Synthetic Digital Terrain Model) as a general condition model of civil engineering design is suggested and the original concept of DTM and DEM ( Digital Elevation Model) enlarged.

本文提出了作为工程设计一般条件模型的综合数字地面模型的概念，对原数字地面模型概念进行了拓展。

Based on the 1971& 2000 monthly precipitation data observed at 34 meteorological stations in the Chongqing region and the 100 m × 100 m DEM ( Digital Elevation Model) of Chongqing, the spatial distribution of precipitation of Chongqing was studied.

采用重庆地区34个气象观测站1971&2000年30a平均月降水总量资料，以及重庆地区100m×100m DEM（Digital elevation model）数据，对重庆地区降水空间分布进行研究。

With the development of modern hydrology, computer technology and 3S ( Remote Sensing, Geographical Information System, Global Position System) high-tech, distributed Hydrological Models based on DEM ( Digital Elevation Model) are becoming the new trend of Hydrological Models.

基于DEM的分布式水文模型是现代水文学同计算机，3S等高科技技术相结合的产物，是水文模型新的发展方向。

Most of distributed hydrological models are based on DEM ( Digital Elevation Model), by which we can extract drainage network automatically.

分布式水文模型大多基于DEM（数字高程模型），通过DEM，可以自动提取流域的地貌特征，其中包括流域数字河网的生成。

In the aspect of geological and mining, 3D data modeling is widely used in DEM ( Digital Elevation Model), mine surface modeling, and 3D open-pit modeling.

在地质采矿方面，三维数据建模广泛应用于数字高程地表建模、矿体表面建模，以及三维露天采坑建模等领域。

The distributed hydrological model based on DEM ( digital elevation model) is also an available approach to resolve diversified hydrological estimation in the regions that are short of data.

基于数字高程模型的分布式水文模型也是解决资料短缺地区的各种水文估计的有效途径。

Aiming at the demands of high efficiency and accuracy for seafloor DEM ( digital elevation model), the paper compared and analyzed thinning methods of mass data acquired by multibeam sounders.

针对构建海底DEM高效率、高精确度的要求，对比分析了海量多波束水深数据的抽稀方法。

DEM ( Digital Elevation Model) has become one of the core data of geographical spatial database in many countries and regions, the currentness of DEM is an important measure to evaluate the using value of it.

DEM已成为各个国家和地区地理空间数据库中核心数据之一，现势性是衡量其应用价值的重要指标。

The precision of Fukang digital elevation model was analyzed by DEM gross error.

通过对DEM的粗差检测分析，分析阜康地区的数字高程模型精度。

Based on some river basin characteristics collected from DEM ( Digital Elevation Model), such as the confluence network, length and gradient of flow route, and slope, a loose and coupled distributed hydrological model was developed for the Sanmenxia-Xiaolangdi section.

依据从DEM中提取的汇流网、水流路径长度和坡度等流域特征，建立了适合于黄河三门峡&小浪底区间水文过程的松散耦合型分布式水文模型。

In addition, we also investigate how do such scale-dependent changes vary with different types of landscape data, based on NDVI and DEM ( Digital Elevation Model).

此外，基于NDVI和数字高程模型（DEM）也探讨了对于不同的数据类型，格局的尺度依赖性如何变化。

The development of computer technology, GIS technology, remote sensing technology and digital photogrammetry provides a bright future for the application of DEM ( Digital Elevation Model) and remote sensing image.

计算机技术、GIS技术、遥感技术和数字摄影测量的发展，为DEM（Digital elevation model）和遥感影像的应用开辟了广阔的前景。