D.L.についての土木用語解説

DLとは　（でぃーえる）

Datum Line（DL）　工事などの基準面の高さを表す。

〔追記する〕

1．CALSとは　（きゃるす）

Continuous Acquisition and Life-cycle Support （継続的な調達とライフサイクルの支援） の略。一定の標準に基づいて情報の電子化を図り、ネットワークを介し情報の交換･連携さらには共有を可能とし、製品等の開発期間の短縮･コストの削減･生産性の向上を図ること。

2．CDLとは　（しーでぃーえる）

基本水準面のこと。海図の零位、すなわち海図の推進の基準値のことであり、平均水面から主要4分潮の半潮差の和を差し引いた水面である。

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