https://communities.sas.com/t5/SAS-Programming/geodist-function/m-p/43880#M8994 Accroding to this SAS note:<BR /> <A href="http://support.sas.com/kb/36/198.html" target="_blank">http://support.sas.com/kb/36/198.html</A><BR /> <BR /> The new GEODIST function in SAS® 9.2 returns the geodetic distance between two latitude and longitude coordinates.<BR /> <BR /> <BR /> Is this geodetic distance the same as spherical distance/great-circle distance? Tue, 05 Apr 2011 05:33:48 GMT MarcTC 2011-04-05T05:33:48Z https://communities.sas.com/t5/SAS-Programming/geodist-function/m-p/43880#M8994 Accroding to this SAS note:<BR /> <A href="http://support.sas.com/kb/36/198.html" target="_blank">http://support.sas.com/kb/36/198.html</A><BR /> <BR /> The new GEODIST function in SAS® 9.2 returns the geodetic distance between two latitude and longitude coordinates.<BR /> <BR /> <BR /> Is this geodetic distance the same as spherical distance/great-circle distance? Tue, 05 Apr 2011 05:33:48 GMT https://communities.sas.com/t5/SAS-Programming/geodist-function/m-p/43880#M8994 MarcTC 2011-04-05T05:33:48Z https://communities.sas.com/t5/SAS-Programming/geodist-function/m-p/43881#M8995 No, it uses the Vincenty formula as referenced in the documentation of the function. See<BR /> <BR /> <A href="http://en.wikipedia.org/wiki/Vincenty%27s_formulae" target="_blank">http://en.wikipedia.org/wiki/Vincenty%27s_formulae</A> Tue, 05 Apr 2011 15:41:31 GMT https://communities.sas.com/t5/SAS-Programming/geodist-function/m-p/43881#M8995 Doc_Duke 2011-04-05T15:41:31Z