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function to convert 3D geographical coordinates to Cartesian?

Tom Roche 
Is there packaged code to convert geographical coordinates (e.g.,
longitude, latitude, elevation) to Cartesian coordinates in 3-space?
The spherical-to-Cartesian math is straightforward enough, but there's
certainly scope for error, so I'd prefer to use tested, previously-used
code if available.

TIA, Tom Roche <Tom_Roche at pobox.com>

Thread (4 messages)

Tom Roche function to convert 3D geographical coordinates to Cartesian? Dec 29 Edzer Pebesma function to convert 3D geographical coordinates to Cartesian? Dec 30 Tom Roche function to convert 3D geographical coordinates to Cartesian? Dec 30 Tom Roche function to convert 3D geographical coordinates to Cartesian? Dec 30