Users that want to compute their own Euler poles can do it with this tool. For using it all is needed are two lines in the main window, which will be mouse selected after hitting the “Pick lines from figure” button, and an initial estimate of the Euler pole. For selecting the lines follow the same procedure as described above for Euler rotations. That is: left-click to select and right-click to accept – once for each line. The results of the searching algorithm are graphically displayed every time a better fit pole is found. If at the end of the process the user is not fully satisfied with the result, that entire he needs is to restart again using this time a better initial guess of the starting pole.

Starting on version 2.0 the computation of the Euler poles is done by converting first the latitudes from geodetic to geocentric. The latitude of the pole location is reported in geodetic latitudes. In previous versions the calculus was performed without doing any latitude conversion. The result from both ways of computing the pole are normally very similar, except for large angles and when the north-south component of the movement is important. But the most important of all is to not mix rotation carried with geocentric latitudes and poles calculated in geodetic lats, or vice-versa.

Copyright © <2010>, <Joaquim Luis>

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