On the basis of geometric correction for remote sensing images data , detailed character analysis was conducted for the tm images . several image transformations which are linear scale transformation , ratio processing , principal components transformation , tasseled - cap transformation and minimum noise fraction rotation ( mnf transformation ) were then implemented 在对研究区数据进行几何精校正的基础上,对tm数据进行了详细的特征分析,并对其进行了有利于植被信息提取的几种图像变换:线性拉伸、比值增强、主成分变换、缨帽变换以及最低噪声分离变换( mnf变换) 。
Furthermore , the dq value ranges of profile multifarctal spectra in different landform types and in different directions of the same sections perform different properties and anisotrpies . it can be concluded that the landscape fractal properties depends closely on the int ensity , manner and inhomogenity of exogenic and inogenic processess , and with the properties , we can study quantatively the dynamic geomorphic process . by using the same methods just above , local fractal dimensions d , crossover length tc and the multifractal spectra dq - q of two large - scale landform profiles ( across and along tianshan mountain ranges respectively ) are calculated . the results show that in the studied scaling range the two profiles perform different scaling properties , and both of them can be divided to three evident different linear scaling subsections 不同类型地貌区二维地貌表面也表现出多度域分形特征,而且随着观测尺度的增加,每个区间的分维值均表现为依次减小,表明外营力作用的影响逐渐被内营力作用所取代:不同类型地貌区在相应区间的分维值表现为高山区中低山区盆地区,体现了不同类型地貌表面粗糙性或复杂性的差异,因此分维值大小可作为地貌表面外营力侵蚀作用强度的重要指标:利用标度区的间断点和各种地貌类型表面分维值或宏观效应趋于一致,提出5 - 6km左右可作为地貌的宏观临界点,并且与利用地貌剖线研究所得到的5km这一数值是基本吻合的。