利用DEM数字高程模型计算坡度的差异性分析

以DEM数字高程图为本底资料进行坡度图的计算,精确度高,方法简单,省时省力,针对全省面积的大范围坡度图制作由于涉及到不同地形,不能只建立一套标准。分别针对山地、平原、丘陵3种地形进行坡度计算,像元值分别采用25 m,50 m,100 m,150 m,200 m,5个分级,得出同地形在不同像元大小情况下,像元越小,差异越小;同像元大小在不同坡度级别情况下,坡度越大,差异越大。

Analysis of the Diversity Using DEM Numeral Elevation Model Calculating Declivity

Calculating declivity chart carrying on the DEM numeral elevation as the background material,the precision is high,the method is simple,saving time and efforts.Because of involving different terrain,a set of standards making wide range declivity chart in view of entire province can't be established.The authors calculate declivity separately aiming at the mountainous region,plain and hilly area,images separately using 25 m,50 m,100 m,150 m,200 m,5 graduations,it is concluded that the same terrain is in different image plain size,the smaller image plain is,the smaller diversity is;the same image plain is in different declivity situation,the larger declivity is,the larger diversity is.