Dear Louis and Bruce, Thanks for your help. It is now much clearer.
Cheers, Pat Naughtin CAMS Geelong, Australia on 2002-12-05 19.41, Louis JOURDAN at [EMAIL PROTECTED] wrote: > At 22:31 -0500 02/12/4, Bruce Hebbard wrote: >> The coordinates cited below are almost certainly ECEF or >> "Earth Centered, Earth Fixed", as described by Peter H. Dana >> (which is about all I know about this :)... >> [begin quote] >> * Earth centered, earth-fixed, X, Y, and Z, Cartesian coordinates >> (XYZ) define three dimensional positions with respect to the center >> of mass of the reference ellipsoid. >> * The Z-axis points toward the North Pole. >> * The X-axis is defined by the intersection of the plane defined by the >> prime meridian and the equatorial plane. >> * The Y-axis completes a right handed orthogonal system by a plane >> 90 degrees east of the X-axis and its intersection with the equator. >> [end quote; from... >> http://www.colorado.edu/geography/gcraft/notes/coordsys/coordsys_f.html >> <Peter H. Dana, The Geographer's Craft Project, Department of Geography, >> The University of Colorado at Boulder> >> see Coordinate Systems / Global Systems / ECEF X, Y, Z for links to a >> couple of handy diagrams] >> >> The US National Geodetic Survey has a little interactive converter at >> http://www.ngs.noaa.gov/TOOLS/XYZ/xyz.html; plugging in the XYZ values >> you gave (in *meters*, he said, desperately trying to keep this on topic >> :-), it spits out... > > Fascinating! > > And it also works the other way around : from now on my postal address will > be: > X = 4269556.7194 > Y = - 48024.6218 > Z = 4722335.2744 > > (please note that the Z coordinate above refers to my favorite > position, i.e. lying in my bed...) > > Louis >
