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Point in the ONwinsor subgrid.
82d00'00.000"W 42d00'00.000"N 0.0 81d59'59.6104"W 42d0'0.1602"N 0.000
82d00'01.000"W 42d00'00.000"N 0.0 82d0'0.6104"W 42d0'0.1602"N 0.000
82d00'02.000"W 42d00'00.000"N 0.0 82d0'1.6104"W 42d0'0.1602"N 0.000
84d00'00.000"W 42d00'00.000"N 0.0 83d59'59.8593"W 42d0'0.18"N 0.000
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Try with NTv2 and NTv1 together ... falls back to NTv1
99d00'00.000"W 65d00'00.000"N 0.0 99d0'1.5885"W 65d0'1.3482"N 0.000
111d00'00.000"W 46d00'00.000"N 0.0 111d0'3.1897"W 45d59'59.7489"N 0.000
111d00'00.000"W 47d30'00.000"N 0.0 111d0'2.7989"W 47d29'59.9896"N 0.000
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Switching between NTv2 subgrids
-112.5839956 49.4914451 0 -112.58307487 49.49145197 0.00000000
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Interpolating very close (and sometimes a bit outside) to the edges a NTv2 subgrid (#209)
-115.58333333 51.25000000 0 -115.58228512 51.24997866 0.00000000
-115.58333333 51.25000010 0 -115.58228512 51.24997876 0.00000000
-115.58333334 51.25000000 0 -115.58228513 51.24997866 0.00000000
-115.49166667 51.07500000 0 -115.49062909 51.07497666 0.00000000
-115.49166668 51.07500000 0 -115.49062910 51.07497666 0.00000000
-115.49166667 51.07499990 0 -115.49062909 51.07497656 0.00000000
##############################################################
Attempt first with ntv2_0.gsb and then conus
-111.5 45.26 -111.50079772 45.25992835 0.00000000
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NAD27 -> NAD83: 1st through ntv2, 2nd through conus
55d00'00.000"N 111d00'00.000"W 0.0 55d0'0.366"N 111d0'3.251"W 0.000
39d00'00.000"N 111d00'00.000"W 0.0 38d59'59.912"N 111d0'2.604"W 0.000
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