> Does anyone know how to determine the tangent to a point on a wgs84 ellipsoid? > In particular I'm trying to find the "geodetic center point" of a wgs84 > ellipsoid based on a geodetic point on the surface.
Given an ellipsoid E a^2 x^2 + b^2 y^2 + c^2 z^2 = 1, the equation of the tangent plane touching E in the point (x_0,y_0,z_0) is a^2 x_0 x + b^2 y_0 y + c^2 z_0 z = 1. -Gerhard -- | voice: +43 (0)662 642934 *** web: http://www.cosy.sbg.ac.at/~gwesp/ | | If emailing to [EMAIL PROTECTED] doesn't work, please try [EMAIL PROTECTED] _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
