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GIS data is of great value. The high cost of GIS data acquisition and the ease of data exchange via networks make the protection of distributed data sets a crucial issue. To resolve this kind of issues, many digital watermarking algorithms for vector digital maps have been proposed. However, most existing algorithms don’t fit the building layers… (More)
Our paper has studied the Oracle spatial GeoRaster feature and the OCCI programming environment with OTT. Using the above knowledges, this paper has implemented the GeoRaster image visualization in VisualC++6.0 based on data blocking and pyramid structure.