[Proj] Calculating +towgs84 values from source / dest .xyz file

[Mark Johnson]

Is there a c program source that can take a list of x/y/z points for a
source and destination and calculate a valid 7 parameter +towgs84 value
that could be used with cs2cs?

I found something similar at http://helmparms3d.sourceforge.net/, called
helmparms3d - but it seems calculate values that cannot be used for
+towgs84.

Mark Johnson, Berlin Germany
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