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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Geographic coordinate conversion ： ウィキペディア英語版 Geographic coordinate conversion In geodesy, conversion among different geographic coordinate systems is made necessary by the different geographic coordinate systems in use across the world and over time. Coordinate conversion comprises a number of different types of conversion: format change of geographic coordinates, conversion of coordinate systems, or transformation to different geodetic datums. Geographic coordinate conversion has applications in cartography, surveying, navigation and geographic information systems. In geodesy, geographic coordinate ''conversion'' is defined as translation among different coordinate formats or map projections all referenced to the same geodetic datum. A geographic coordinate ''transformation'' is a translation among different geodetic datums. Both geographic coordinate conversion and transformation will be considered in this article. This article assumes readers are already familiar with the content in the articles geographic coordinate system and geodetic datum. ==Coordinate format conversion== Informally, specifying a geographic location usually means giving the location's latitude and longitude. The numerical values for latitude and longitude can occur in a number of different formats:〔(【引用サイトリンク】url=http://www.ordnancesurvey.co.uk/gps/transformation )〕 * degrees minutes seconds: 40° 26′ 46″ N 79° 58′ 56″ W * degrees decimal minutes: 40° 26.767′ N 79° 58.933′ W * decimal degrees: 40.446° N 79.982° W There are 60 minutes in a degree and 60 seconds in a minute. Therefore, to convert from a degrees minutes seconds format to a decimal degrees format, one may use the formula : $\backslash rm\; =\; \backslash rm\; +\; \backslash rm/60\; +\; \backslash rm/3600$. To convert back from decimal degree format to degrees minutes seconds format, : $\backslash begin$ \rm & = \lfloor\rm\rfloor \\ \rm & = \lfloor 60 *(\rm - \rm)\rfloor \\ \rm & = 3600 *((\rm - \rm) - \rm/60) \\ \end where the notation $\backslash lfloor\; x\; \backslash rfloor$ means take the integer part of $x$ and is called a floor function. 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「Geographic coordinate conversion」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.