Abstract
Abstract. Developing the project of geographic national conditions investigation is in order to obtain land cover change information which is caused by natural and human social and economic activities, and serve the information for government, enterprise and public. Land cover is an important method to describe the geographic national conditions information, which can truly reflect the land surface material type and its natural attribute. It has been contained in the content system preliminary scheme as an important portion. In this paper, it discusses and analyzes on the method and key technology, with according to the land cover content that geographic national conditions watches on. Then it evaluates the applicability of automatic classification method using in land cover information extraction, and comprehensively analyzes various extraction methods’ maximum effectiveness. Finally, it proposes a method that is based on high spatial resolution remote sensing imagery and can be used in engineering applications, which provides a reference method for geographic national conditions investigation.
Highlights
Land cover information obtaining is the primary mission of the project of geographic national conditions investigation; it’s the basis of the project
There are five series of global land cover products issued so far, correlative research is developed in China
The scale of global land cover research is too small, and it aims at satisfying the requirement of global change and earth’s mode simulation, which uses lower spatial resolution images
Summary
Land cover information obtaining is the primary mission of the project of geographic national conditions investigation; it’s the basis of the project. The classification system established in the project of geographic national conditions investigation is from the point of view of monitoring the changing information of geographic objects throughout the country, which has synthetically considered the requirements of multi-areas, and has referenced the national standards, technology norms and land cover classification systems that have been issued and applied broadly. In this project, it uses middle and high spatial resolution remote sensing images to extract information. The paper proposes a feasible method based on analyzing the theory of classification methods, which can provide references for the project of geographic national conditions investigation
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