Remotely sensed data is becoming more and more important in GIS application.Data conversion between raster and vector is one of the key technologies for the integration of RS and GIS.In this paper

we analyzed the relations between pixel and pixel in the classified raster map.Based on the relations

all vector points and the connection information between them can be extracted. All arcs are traced rapidly by using the connection information between points. Polygons and the topological information between polygons are built automatically from the arcs.Finally

the experiment demonstrates that the method is a highly efficient scheme to automatically convert classified raster map to general format GIS data.