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How to provide cost effective, high performance spatial relation/spatial predicate implementation is one important issue for Internet map server design. To avoid the disadvantages of computational geometry algorithm approach, it proposes one improved method, combined with the rendering engine, which can enhance the filter accuracy. This proposal can record coverage area of border grid cells accurately...
How to provide cost effective, high performance spatial query and spatial analysis implementation is one important issue for internet map server design. In this paper, we present one novel, rasterization approach to internet map server design and implementation. Like most modern internet map server implementation, this system stores pre-rendered map image tiles for different scales on the web server,...
It is a critical technique in GIS about how to implement spatial relation/spatial predicate with high performance. To avoid the disadvantages of computational geometry algorithm approach, we propose one improved method, combined with the rendering engine, which can enhance the filter accuracy and avoid drawbacks of four color raster signature (4CRS). This proposal can record coverage area of border...
The spatial index method is one critical factor affecting the query performance in the case of web feature service. The R-tree method, which is one popular method used in spatial database, has limitations for web feature service. In this paper, we propose one rasterization spatial index method utilizing AGG as the engine for the mapping between geographic features and image pixels. After illustrating...
It is a critical technique in GIS about how to implement map overlay with high performance. To avoid the disadvantages of computational geometry algorithm approach, an optimal algorithm based on rasterization is proposed in this paper, which adopts approach of rasterization of vector polygons with run length encoded scan line, map overlay on the basis of raster representation and vectorization of...
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