Digital raster graphic(DRG) and digital line graphic(DLG) are two digital maps that can be taken cheaply, and DLG is a commonest data format now, it is the main data source of GIS.
数字栅格图和数字线划图是可以低成本获取的两种数字地图，而DLG是目前最普遍的矢量数据格式，是GIS的主要数据来源。
Digital raster graphic(DRG) and digital line graphic(DLG) are two digital maps that can be taken cheaply, and DLG is a commonest data format now, it is the main data source of GIS.
数字栅格图和数字线划图是可以低成本获取的两种数字地图，而DLG是目前最普遍的矢量数据格式，是GIS的主要数据来源。
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