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1·Based on the principles of fuzzy mathematics, this paper established the fuzzy comprehensive assessment model of the quality of DLG, one of the 4d products.

本文以模糊数学的原理为基础，建立了“4d”产品之一的DLG产品质量的模糊综合评价模型。

2·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。