By use of the rapid assessment approach of soil erosion based on minimum polygons,a case study is conducted in the Yellow River basin where serious erosion is occurring.

In view of the limitations of the traditional models in applications in different temporal and spatial scales,this paper presents a rapid soil erosion assessment approach based on minimum polygons.

An algorithm for the reproduction patterns recognition in the cellular automata;

Hexagon pattern and stripe pattern in dielectric barrier discharges in Argon;

Experimental investigation of square superlattice pattern formation in a dielectric barrier discharge;

Based on dynamic change update pattern,polygon characteristic and polygon object update model during the land use mapping,the dynamic change technique is proposed incorporating the GIS spatial analysis function.

<Abstrcat>Urban and rural integrated cadastral data would be divided into four layers,which stores the canton data,cadastral parcel data and patch data to express the situation of land utilization.

The method solved the relevant technical problems in patch interpretation,extraction and investigation for land changes using SPOT-5 data.

Taking LANDUSE-DAT files as data sources, this paper discusses the features, data structure, and generating methods of topological relationships of between in landuse database generalization, and puts emphasis on the methods for preserving consistency of topological relationships of patches in the process of landuse database generalization.

The homogeneous spectral units patches,were taken as the classification unit,and the neighboring-searching algorithm was employed to obtain the relationship of different spatial features,which results in higher classification accuracy of wetland,grassland and farmland.