【摘要】 通过遥感技术在广西都安县石漠化预测分析研究中的应用 ,讨论了应用遥感技术圈定石漠化区域与遥感地质填图的异同 ,提出了“对石漠化区域的确定也就是对满足条件DR∈DC∩DV区域的确定”的数学分析结论和两种提取石漠化遥感影像信息方案 :一种是以石灰岩波谱特性和热性质参数为基础 ,直接从TM像元亮度 (或灰度 )数据中提取石漠化影像信息的方案 ;另一种是以植被波谱影像模型和图论为基础 ,通过对DC 与DV影像区域的图形关系逻辑运算 ,间接提取出裸露石灰岩分布区域的整体图形信息 (即边界线信息 )的方案。通过试验区 1991年和1998年两种TM时相的 30× 2种像元分析法试验 ,确定出以TM6波段图像为中心波段的最佳假彩色合成增强处理方案。将此方案用于对都安县全区 1991年和 1998年两种时相的TM图像处理 ,获得了“都安地区石漠化范围正在扩展 ,而这种扩展与当地人类活动加剧有关”的研究结论。更多还原

【Abstract】 This paper has discussed the similarities and differences between remote sensing and remote sensinggeological mapping in the rocky desertification area and drawn a mathematical analytical conclusion that the determination of the rocky desertification area is equivalent to the determination of the area that satisfies the condition D R∈ D C∩ D V . On such a basis, two schemes for extracting information from remote sensing images of rocky desertification are advanced. One is to extract the information of remote sensing images of the rocky desertification directly from brightness (or gray level) of every pixel based on the frequency characteristics of limestone rocks and the heat characteristic parameters, in which the relevant method used is called pixel analysis method or direct recognition method. The other is to extract the whole graphical information of the outcrop distribution area of limestone rocks indirectly through logical correlation operation between image areas D C and D V based on the model of vegetation image frequency and topology, in which the relevant method used is called graphic analysis method or indirect recognition method. The optimum scheme for pseudo-color composition with the Axis of TM6 as the central waveband has been determined through two times of 30×2 tests of pixel analysis method for images in the test area. Through comprehensive interpretation, it is concluded that the expansion of the rocky desertification area in Du’an is related to excessive human activities. This achievement is attributed to the utilization of this scheme to TM image processing in Du’an County in 1991 and 1998.更多还原