Title: Research in WebGIS Vector Spatial Data Compression Methods
Abstract: This paper introduces author's work in to vector spatial data, which will be transported in Internet/Intranet. On the basis of vector spatial data method, which is proposed by, the authors proposes next four innovation:(1)For vector spatial data, not only integer but also short data can be used to replace traditional double or float data. (2)The map data are mapped to a virtual screen, the formula of virtual screen width is: width=DispWidthPixel×MaxEnlargeRatio/stepWidth①. (3) In the mapping process, execute filter points compression to pattern points of arc(including polygon's boundary arc and line's arc). In the formula ①, if stepWidth=1, filter compression has no loss in precise of map displayed, else stepWidth1, it has precise loss in map displayed. (4) Long edge adding point to deal with exception of Offset compress to pattern points in arc, which offset in adjacent two points may larger than 127. After these compressions, a map vector data may be compressed to 20% or less.
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
Access and Citation
Cited By Count: 7
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