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【求助】一个ArcInfo grid文件的投影问题
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<P>ncols 351 nrows 396 xllcorner ??????? yllcorner ?????? cellsize 20000 NODATA_value -9999 整个北美数据,知道分辨率20km,等角投影。还有这些信息:</P> <P><B><FONT size=3>North American grid: </FONT></B> <p> <P><FONT size=3> parameter (cenlon = -100., ! longitude of projection center <p></FONT> <p> <P><FONT size=3> * cenlat = 45., ! latitude of projection center <p></FONT> <p> <P><FONT size=3> * offx = -190., ! offset from projection center <p></FONT> <p> <P><FONT size=3> * offy = -140., ! to grid center (->E,->N, km) <p></FONT> <p> <P><FONT size=3> * earthr = 6.37122e6, ! earth radius (m) <p></FONT> <p> <P><FONT size=3> * sp1 = 30., ! standard parallel #1 (deg N) <p></FONT> <p> <P><FONT size=3> * sp2 = 60.) ! standard parallel #2 (deg N) <p></FONT> <p> <P> <P>但资料中的这两个参数xllcorner,yllcorner怎么设啊?SOS! </P> |
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