Digital Terrain Model is a general designation of space topographical data set, and it is the digital description with the figure of space position and topographical attributive character.
数字地形模型是空间地形数据集合的统称，是具有空间位置特征和地形属性特征的数字描述。
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The working principle and design methods of this digital circuitry and system integration with CPLD are also introduced. The features and technical points in system designation are discussed as well.
The standard of size designation of clothes is one of the most important basic standards in clothe industry. It provides us a digital basis for the garment production and technical research.