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I3.注
任意の
Epoch tでの、ITRF間の座標変換パラメータP(t)は、基準Epoch1998.0での座標変換パラメータP(1988.0)より出発して次のごとく与えられる。P
(t)=P(1988.0)+P(t-1988.0)
ここで、
Pは変換パラメータの時間変化率である。