岩溶石漠化遥感信息增强技术探讨

Enhancement of Remote Sensing Information Technique of Rocky Desertification

岩溶石漠化是存在于中国西南及南方岩溶地区严重的脆弱生态地质问题,利用遥感技术的优势,可以准确、快速、经济地获取岩溶石漠化的现状、分布规律等结果数据,为石漠化的监测、石漠化的演变分析及后续治理提供科学依据。但在遥感调查与监测工作中,如何增强石漠化信息,方便后续的信息提取工作,已成为研究的热点与难点问题。影响岩溶石漠化的发育的因素众多,其评价指标一般考虑岩石裸露程度及其结构、植被结构等。在岩溶石漠化遥感信息增强工作中,很难直接获取岩石的裸露信息。野外调查发现:在热带亚热带岩溶地区,岩石的裸露程度与植被覆盖程度呈负相关关系,岩石的裸露程度越高,植被覆盖程度越低,岩溶石漠化越发育;据此可以利用植被覆盖情况来获取岩溶石漠化信息。在增强岩溶石漠化信息方面,本文提出了改进增强型植被指数模型(GEVI),并与现有的常用植被指数模型对比试验发现,具有较好的应用效果。

The rocky desertification is a terrible weak eeo -geographical problem in southwest China and karst area. By using the advantages of remote sensing, it can get the data exactly, quickly and economically, such as the condition and distribution regulation of rocky desertification, afford the scientifc accordance of monitoring, evolution and follow treatment. But in the investment and monitoring of remote sensing, how to improve the rocky desertification information and easy for follow information collection became the focus and rub of the study. There are many factors which effect the development of rocky desertification, the evaluating indi＇ cator usually consider the exposed grade and structure of rock and structure of vegetation and so on, In the enhancement of remote sensing information technique, it＇ s hard to get the exposed information of rock directly. By the field investment, it＇ s found that in the tropical and sub - tropical karst area, the expose grade of rock is Contrary to the over grade of vegetation, the more exposed rock, the less vegetation, the more development the rocky desertification. It can get the information of rocky desertification by using the vegetation cover condition. In the enhancement of remote sensing information technique, it carried out enhancement vegetation index model, and compared with the present vegetation index model, it has better application.