EPSG guidance note #7-2, http://www.epsg.org 2017-09-23 true false false Given a point with geocentric Cartesian 3D coordinates at coordinate epoch 2005.00 and having linear velocities: X = 2845456.0813 m VX = –0.0212 m/yr Y = 2160954.2453 m VY = +0.0124 m/yr Z = 5265993.2296 m VZ = +0.0072 m/yr t = 2005.00 (years) whose coordinates are required at coordinate epoch 2010.00. X(t=2010.00) = 2845456.0813 + (–0.0212) * (2010.00 - 2005.00) Y(t=2010.00) = 2160954.2453 + (+0.0124) * (2010.00 - 2005.00) Z(t=2010.00) = 5265993.2296 + (+0.0072) * (2010.00 - 2005.00) Then X = 2845455.9753 m Y = 2160954.3073 m Z = 5265993.2656 m t = 2010.00 (years) urn:ogc:def:method:EPSG::1064 Point motion (geocentric Cartesian) Note: These formulas have been transcribed from EPSG Guidance Note #7-2. Users are encouraged to use that document rather than the text which follows as reference because limitations in the transcription will be avoided. The Cartesian coordinates of a point at coordinate epoch t1 may be calculated at any other coordinate epoch t2 from: [X(t2)] = [X(t1)] + (t2 - t1) * [Vx] [Y(t2)] = [Y(t1)] + (t2 - t1) * [Vy] [Z(t2)] = [Z(t1)] + (t2 - t1) * [Vz]