摘要
ＴＭ图像是以０－２５５不同灰度级反映不同地物光谱反射信息的。在应用ＴＭ数据找矿时是以增强、提取图像中矿产信息为目的设计图像处理流程。传统的图像处理方法中将图像原始数据整体进行运算以减轻或压缩图像数据中一种背景信息突出目标信息，这种方法应用在多种环境因素干扰背景条件下增强图像目标信息时效果则受到影响，以致于无法增强所需要的信息。本研究课题在如何排除和减小环境因素干扰方面进行了研究和探索，取得一定效果。
Landsat 5 TM data, provides seven spectrum bands 30×30 spatial resolution information and good market price, is widely used in geological exploration and mapping. The spectrum characteristics of mineral assemblages in hydrothermally altered rocks depend on mainly the temperature, pressure chemical fluids and composition of host rocks. Altered rocks are geneticaly related to ore so that mapping hydrothermally altered rock spectrum using TM spectrum bands is an indirect approach to predict ore body. Rowan (1982), Abrams(1989)successfully identified alteration using TM 5/7 and 3/1 spectrum bands in rock exposed area. Loughlin(1991), Zhao Yanhong(1991), Xu Ruisong(1991) have confirmed that altered rocks can be distinguished by combination of 4/3, 5/7+PCA in dense forest areas.However, these methods are not effective in various environmental impact areas, The method designed for two project have got more effective results. The method consists of three steps(1) TM image masking,(2)PCA, (3)result components scatter map masking, the process is directed by characteristics of rock spectrum and by TM band loading values of PCA.
出处
《地质找矿论丛》
CAS
CSCD
1994年第2期84-88,共5页
Contributions to Geology and Mineral Resources Research
基金
国家人事部留学归国人员基金
