DEM数据可视化在地震应急中的应用

Study on DEM data Visualization

数字高程模型(Digital Elevation Model简称DEM)是通过一组有序数值阵列对地面海拔高度数字描述的实体地面模型,是数字地形模型(Digital Terrain Model,简称DTM)的一个子集。并可通过对DTM数字处理得到其他各种地形特征值。DTM是描述包括高程在内的各种地貌因子,如坡度、坡向、坡度变化率等因子在内的线性和非线性组合的空间分布,其中DEM是单一的数字地貌模型,通过对DEM数据处理可派生出坡度、坡向及坡度变化率等地貌特性。基于ARCGIS技术平台,对DEM数据进行处理建模,可以得到地形真实情景再现,为震后应急指挥人员、工作人员了解震区的地貌、地形提供直接的数据支撑。

Digital Elevation Model DEM for short array is an ordered set of numerical description of EGL digital terrain model of the entity, is a Digital Terrain Model（DTM） is a subset of the. And through the DTM digital other kinds of terrain features. DTM is to describe the various geomorphologic factors, including elevation, slope gradient, slope, direction of slope factors, rate of change of linear and nonlinear combinations of spatial distribution, of which DEM is a single digital relief model, based on DEM data processing can derive slope, aspect and slope landform characteristics such as rate of change. Based on the ARCGIS platform, to process DEM data modeling terrain real situation can be obtained, and for earthquake emergency commanding officer, landforms, topography of the staff to the earthquake zone to provide direct support.