诸广岩体南部高植被覆盖区遥感蚀变信息提取

发布时间：2018-05-14 02:30

本文选题：诸广岩体 + 遥感蚀变信息提取　；参考：《铀矿地质》2015年03期

【摘要】：诸广南部花岗岩型铀矿田区内与铀矿化相关的赤铁矿化、绿泥石化和水云母化蚀变发育,但区内植被覆盖度高,直接对遥感图像进行铁染、羟基蚀变信息提取易受植被等因素的干扰。为了去除植被、水体、阴影和第四系的影响或使它们的影响降低到最小程度,分别采用ETM+4/3波段比值的高值掩模去除植被、7/1波段比值的低值掩模去除水体和阴影、以及用第四系分布的矢量图层掩模去除第四系的干扰。对去除干扰后的图像,利用ETM+1、3、4、5波段进行主成分分析,分析认为其第四主成分的高值为铁染主分量信息;ETM+1、4、5、7波段主成分分析结果显示其第四主成分为羟基主分量信息。将铁染和羟基主分量信息分别经过滤波处理和统计密度分割,获取诸广岩体南部铁染和羟基蚀变异常的分布信息。
[Abstract]:The hematitization associated with uranium mineralization in the granitic uranium ore field in the southern part of the Guangdong Province is characterized by the development of green-mud fossilization and hydromica alteration, but the vegetation coverage in the area is high, and the remote sensing images are directly stained with iron. The extraction of hydroxyl alteration information is easily disturbed by vegetation and other factors. In order to remove or minimize the effects of vegetation, water body, shadow and Quaternary system, the high value mask of ETM 4 / 3 band ratio is used to remove the low value mask of 7 / 1 band ratio of vegetation to remove water body and shadow, respectively. And the Quaternary pattern mask is used to remove the Quaternary interference. After removing the interference, the principal component analysis (PCA) was carried out in the band of ETM _ (1) ~ (3) O _ (3) and (4) ~ (5). It was concluded that the high value of the fourth principal component was the principal component information of iron stain. The results of principal component analysis in the band of ETM _ (1) ~ (4) ~ (4) ~ (5) ~ (5) showed that the fourth principal component was hydroxyl principal component. The iron-stained and hydroxyl group principal component information are filtered and the statistical density is partitioned respectively to obtain the distribution information of iron-stained and hydroxyl alteration anomalies in the southern part of the Guang rock mass.
【作者单位】：东华理工大学江西省数字国土重点实验室核资源与环境教育部重点实验室;
【分类号】：TP751

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