SPIE Proceedings [SPIE Geoinformatics 2008 and Joint Conference on GIS and Built environment: Advanced Spatial Data Models and Analyses - Guangzhou, China (Saturday 28 June 2008)] Geoinformatics 2008 and Joint Conference on GIS and Built Environment: Advanced Spatial Data Models and Analyses - The abstraction method research of river network based on catchments' characters deriving digital elevation data

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