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A digital orthophoto quadrangle〔 〕 (DOQ) is aerial photography or satellite imagery that has been corrected so that its pixels are aligned with longitude and latitude lines, and have a narrowly defined region of coverage. This is a widely used format introduced by United States Geological Survey (USGS).〔 The correction technique is called image rectification and is a large part of photogrammetry.〔 (【引用サイトリンク】 Introduction to Photogrammetry ) 〕 DOQs produced by the USGS cover an area measuring 7.5-minutes longitude by 7.5-minutes latitude (the same area covered by a USGS 1:24,000-scale topographic map, also known as a 7.5-minute quadrangle) or 3.75-minutes by 3.75-minutes. The second format is also known as a digital orthophoto quarter quadrangle (DOQQ) because each covers one quarter of a quadrangle (four 1:12,000-scale DOQQs display the same area as one 1:24,000-scale DOQ).〔 (【引用サイトリンク】 USGS DOQ History ) 〕〔 (【引用サイトリンク】 USGS 7.5-minute maps ) 〕 〔 (【引用サイトリンク】 DOQHEAD Toolkit ) 〕 ==See also== * Orthophoto * QDGC 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「Digital orthophoto quadrangle」の詳細全文を読む スポンサード リンク
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