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针对矿化蚀变信息常常受其他地物信息的干扰与影像空间分辨率的制约而表现得非常微弱的问题,该文以Landsat7号ETM+30m空间分辨率的影像为数据基础,重采样得到一系列不同空间分辨率的影像;运用ETM+波段3/波段1比值法获得铁染蚀变相对含量灰度图,采用分形模型计算出不同分辨率下蚀变矿物的分维值,进而获得分辨率—分维值的一元线性回归方程;最后建立了基于分形理论的蚀变矿物多尺度分析模型,得到蚀变矿物空间分布特征变化的参考尺度。结果表明,在一定尺度范围内(30~280m),蚀变矿物显示出空间尺度特征。
In allusion to the fact that the mineralization alteration information is very weakly restricted by the interference of other geo-information and the spatial resolution of the image, this paper takes the image of Landsat ETM + 30m spatial resolution as the data basis, Series of different spatial resolution images; using ETM + band 3 / band 1 ratio method to obtain the relative content of grayscale iron grained diagram using fractal model to calculate the fractal dimension of altered minerals at different resolutions, and then get the resolution - Dimensional linear regression equation of fractal dimension. Finally, a multi-scale analysis model of altered minerals based on fractal theory is established, and the reference scale for the change of spatial distribution of altered minerals is obtained. The results show that, within a certain range of scale (30 ~ 280m), altered minerals show spatial scale features.