Difference between revisions of "China datums"
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==Datums in China== | ==Datums in China== | ||
| − | + | Please see e.g., http://www.asprs.org/a/resources/grids/05-2000-china.pdf . | |
| + | On this page we aim to just supplement the more widely known information. | ||
==Coordinate systems used in China== | ==Coordinate systems used in China== | ||
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===Web maps=== | ===Web maps=== | ||
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觀測中國電子地圖諸網站常見座標系統， | 觀測中國電子地圖諸網站常見座標系統， | ||
An observation of Chinese web mapping sites shows various non longitude / latitude systems in use. | An observation of Chinese web mapping sites shows various non longitude / latitude systems in use. | ||
| Line 14: | Line 14: | ||
visible in the URLs generated when "sharing" map views with friends. | visible in the URLs generated when "sharing" map views with friends. | ||
| − | + | Also a factor is the state mandated distortion... 另需考慮政府所規定之偏移… | |
| − | |||
| − | |||
| − | + | ====搜狗 Sogou==== | |
| − | + | *[http://map.sogou.com/api/documentation/javascript/api2.0/interface_translate.html Sogou API] (type=1) | |
| − | + | Experimentation proves they are merely using the | |
| − | + | [http://en.wikipedia.org/wiki/Alexander_Ross_Clarke Clarke] 1866 ellipsoid, | |
| − | + | a=6378206.4 rf=294.978698213898 . | |
| − | + | $ [http://proj.osgeo.org/ proj] +proj=merc +ellps=clrk66 | |
| − | |||
| − | |||
| − | + | ====Google==== | |
| + | *WGS84 longitude / latitude | ||
==See also== | ==See also== | ||
*[[Taiwan datums]] | *[[Taiwan datums]] | ||
| + | [[Category:Datums by country]] | ||
[[Category:China]] | [[Category:China]] | ||
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Revision as of 10:03, 1 March 2012
Datums in China
Please see e.g., http://www.asprs.org/a/resources/grids/05-2000-china.pdf . On this page we aim to just supplement the more widely known information.
Coordinate systems used in China
Paper maps
Web maps
觀測中國電子地圖諸網站常見座標系統， An observation of Chinese web mapping sites shows various non longitude / latitude systems in use.
Very many of them are plain Mercator projections. They are visible in the URLs generated when "sharing" map views with friends.
Also a factor is the state mandated distortion... 另需考慮政府所規定之偏移…
搜狗 Sogou
- Sogou API (type=1)
Experimentation proves they are merely using the Clarke 1866 ellipsoid, a=6378206.4 rf=294.978698213898 .
$ proj +proj=merc +ellps=clrk66
- WGS84 longitude / latitude