为了在精细尺度下定量刻画地形特征,给地理建模提供更准确的定量地形参数,克服当今应用领域中常用商业软件的局限性,本研究讨论了面向栅格DEM的"简化数字地形分析软件"(SimDTA 1.0版本)。SimDTA实现了诸多计算局域和区域地形属性、定量描述地形部位信息的现有算法,以及新建算法。例如,针对一个实际的应用问题——坡位模糊分类,采用以坡位典型位置作为原型的新思路,在SimDTA中,实现了一个新的坡位模糊分类方法,能够克服现有其他方法忽略空间位置信息等问题。这一坡位模糊分类方法和SimDTA中实现的其他功能相结合,形成了一套完整的坡位模糊分类流程。本文通过在东北嫩江流域一个小区的实际应用和讨论来体现SimDTA的有效性和实用性。
This paper proposed a digital terrain analysis(DTA) software that mainly uses gridded DEM,i.e.Simple Digital Terrain Analysis Software(SimDTA,version 1.0).Overcoming some limitations in applying common commercial software related to DTA,SimDTA was designed to quantify terrain characterization on a finer scale and provide accuracy for terrain parameters for geographic modeling.Besides many widely-used DTA algorithms,a lot of new algorithms of local topographic attributes,regional topographic attributes,and quantification of slope positions were also implemented in SimDTA.For example,aiming at a practical problem in DTA(i.e.,fuzzy classification of slope positions),we developed a new method for fuzzy classification of slope positions by adopting a new idea in which typical locations of slope positions are used as prototypes and therefore the problems(such as ignorance of spatial information) in former methods can be dealt with.Furthermore,a workflow for fuzzy classification of slope positions was established by implementing this new method and combining it with other functions in SimDTA.This paper used a real application in a small catchment in Nenjiang watershed,Northeast China to show the validity and practicality of SimDTA.