kriging interpolation method

[VivekRatan]

what is the basic difference between ordinary kriging and universal kriging?

[EricKrause]

Universal kriging removes systematic trends in the data before kriging on the residuals.  Ordinary kriging assumes that all apparent trends are due to spatial autocorrelation (and thus aren't actually "trends").

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//003100000048000000.htm
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00310000003s000000.htm

[VivekRatan]

thank you.i got my answer