Converting WGS84 to NAD27 and back

  • Uses a bit of spherical trig called the Standard Molodensky transform
  • PROJ.4 does this for us, too 
cs2cs +proj=latlong +datum=WGS84 +to +proj=latlong +datum=NAD27
  • PROJ.4 knows about lots of other datums and projections, as well
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