DEM及数字地形分析中尺度问题研究综述

A Review on the Scale Issue in DEMs and Digital Terrain Analysis

基于DEM尺度的概念与类型、DEM地形分析的尺度效应、DEM地形分析尺度研究的关键问题、DEM地形分析尺度研究的方法等几个方面的论述,分析了当前国内外在该领域的研究进展,并指出了今后应重点研究的方向,包括自然地面与DEM模拟地面之间的尺度匹配、尺度冲突与尺度耦合的关系;空间尺度参数对DEM地形分析影响的过程与机理;DEM格网单元地形分析的异质性效应。在尺度层面上,提出不同地形复杂度条件下的DEM地形分析的确定性与不确定性规律,建立以尺度为自变量的多尺度地形分析模型,建立DEM地形分析的尺度转换模型。

This paper takes an overall review on the former researches firstly. Focus mainly on the concept, types, scaling effect, key problems of DEM scale, as well as its impact on DEM based digital terrain analysis. A few key research topics were put forward through an overall analysis of the research development in recent years, i.e. the property of scale con- flict and scale matching between natural and DEM simulated surface; the principle and mech- anism of how the spatial scale parameters impact the terrain analysis, the heterogeneity effect in terrain analysis within DEM grid cells. And then, from the view point of regional scale level, both the certainty and uncertainty property in digital terrain analysis should be investigated. In addition, more work should be done to establish a scale depended multiscaled terrain analysis model as well as DTM scale converting models. Finally, the research development tendency was prospected.