This world map data set is extracted and customized from the Digital Chart of the World (DCW) data set and organized as a TatukGIS project file. Data layers are organized for each country separately, and for each state separately in the United States, Canada, Brazil, and Australia. The data for each country or state consists of six SHP format data layers. The separate data sets can be assembled by database query to be displayed together at higher level zooms. At multi-country region or country specific zoom levels, the data files associated with only that particular region or country can be called, thereby enhancing the speed.

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更新时间:2008-2-28 | 录入时间:2007-3-2 | 编辑:liuzh |