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Data frame was designed to store digital map data.
规定了数字地图分区存放的数据结构。
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Data quality controlling is a important index for topographic digital map.
数据质量控制是良好的数字地形图质量的重要保证。
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Data quality controlling is a important index for topographic digital map.
数据质量控制是良好的数字地形图质量的重要保证。
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