Approach of Vectorization for GIS Raster Data Based on Run-length Encoding System
GO Guo-qin · 2004
In order to overcome the restriction of the traditional methods of converting raster to vector, an effective approach of vectorization by using the run-length encoding system of compressed raster is developed in this paper, and the implementation procedures of the algorithm are given in detail. Because the run-length encoding system has the characteristics of accessing easy, proper compressed ratio, and inter-converting with normal raster rapidly, by using this approach, the computer's ability and speed of handling large scale and complex raster with high precision will be promoted. It can be used to extracting the attribute's borderline from the results of raster-type geographical spatial analysis and remote sensing images, this approach has been proved to be high efficiency and implementation easy in the test.