Abstract:

A multi-scale management method for visualization of geographic vector data on server cluster is proposed. Based on the idea of vector data tiling, a global tilepyramid index model is established. Then, the vector dataset is divided into individual vector tiles according to the index structure. When rendering tiles on servers, the tiled dataset acts as the feature data source so as to avoid doing spatial query on the raw dataset on the fly. Experimental results indicate that the proposed method can reduce the time of data preparation and the cost of I/O when rendering a tile image, and consequently promote the performance of geographic vector data visualization.

Key words: vector data;multi-scale;visualization;spherical Mercator;vector tile