The application of remote sensing technique to identifying and classifying the quaternary sediments in south fringe of NAN XIANG basin
Zhao Buyi
Remote Sensing Application Center, Zhongshan university, 510275 China
Liu Yaotin
Wuhan Technital University of Survey and Mapping Wuhan, 430070 China
Abstract
In this paper, we have discussed the application of remote sensing "quantitative approach" to investigate of regional geology and national land in the quaternary sediment covered area, in order to improve the precision and efficiency. Based on the exploration of the typical profile of the Quaternary strata in the southern fringe of Nan-Xiang Basin, and combined with the regional geological investigation at the southern fringe of Nan-Xiang Basin, and combined with the regional geological investigation at the scale of 1:200000, we took the main aim at the method how to extract the information of the Quaternary layer from the remote sensing data. The J-M distance method is introduced as the criterion of selecting the optimum bands and band combinations. The methods of identifying and classifying the quaternary strata by using spectrum date assisted by TDM is discussed. On the basis of the transformation of geometrical projection for MSS images, we have tried to use computer to process the Quaternary geological map in the sub area (Guwan) at the scale of 1:50000.
The general situation of study area
With the development of economical construction, the investigation tasks of regional geology and national land in the quaternary sediment covered area are increasing rapidly. The investigations of the type of formation causes for Quaternary sediment, they're attributing, of Quaternary strata, and the mapping of Quaternary geology are the main point of the study.
These basic data are playing important roles in national planning and constructing. Generally, the landscape in this area is not rolling and was reconstructed by men. (e.g. cultivated)
It is difficult to enhance the precision and efficiency by using the conventional method and visual interpretation for the tasks above, especially for the precision requirements in the investigation of regional geology at medium scales 1:50000 to 1:200000, and the method is efficient for enhancing the precision and efficiency,
XiangFan is located at the Northern part of HuBei Province (112°00' ~ 113°00' 32°00' ~ 32040'N), and the area is about 6960.53 km
2, 80% of the study area (southern finge of Man-Xiang, Basin) is covered by the quaternary sediment. The strata of quaternary developed completely over there with bigger thickness and various type of contributing factors. There is close relationship between space distributing of Quaternary strata and the landforms there. (see
The study was done by combining typical section analysis of quaternary strata with remote sensing quantitative approach, that is, using synthetically method of Quaternary geology for typical section analysis establishing the order of strata, classifying stratum units and making details study in litho logy character of each unit and their depositing environment. The emphasis is put on using remote sensing techniques (especially, quantitative approach) for extracting information about Quaternary strata so that the space distribution of strata units is defined and the map of quaternary geology is finished.
