Study on the hierarchical classification method of land cover in the water-wind erosion region ——Taking Hengshan as an example;

We chose the Hengshan County which in the agriculture and pasturage interlaced zone of northern shaanxi as a study area, and then used the hierarchical classification method to extract land use/land cover information from TM images of the Hengshan County, obtained the thematic maps of 1986 and 2003.

The stratified classification is a method based on the idea of division of layers step by step and different criteria and methods in each layer; while the supervised classification highlights traditional statistical and analytic approach, which is a mature algorithm, simple and convenient as well as easily being operated.

This paper analyzes the necessity of setting up social welfare system for the countryside non-agriculture industry mass of China, and puts forth such a corresponding solution as setting up social welfare system for the countryside non-agriculture industry mass by means of categorizing and classifying, and a creative way .

This paper points out the important functions of and main problems existing in reference-rooms of secondary colleges in university, and taking College of Public Administration of Sichuan University as the example, probes into the book classification of reference-rooms of secondary colleges in university.

This paper analyzes the differences and correlation of field 690 and field 905 in CNMARC, and advances the implementing schemes of subdivision and rough arrangement of book classification under the total open management mode.

He s principal academic achievement, a book entitled Decimal Method of Book Classification in China and its great influence in mainland China and Taiwan after a century so far.