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In cartography, a phase line is a line to show some positional dependency or relation to the passage of time, most often changing phases of a military operation, or changing borders in histogeographic maps. ==Military usage== The term is also used in military terminology to refer to an imaginary line on a map used to coordinate phases of operations.〔 (【引用サイトリンク】 NATO Glossary of Terms and Definitions ) 〕 They are usually distinguished with different code names, varying by the particulars of the mission such as location and nature. By the same token, phase lines are frequently used after a battle or a military campaign by historians to describe what territory was controlled by which side at a given phase of the campaign. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Phase line (cartography)」の詳細全文を読む スポンサード リンク
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