If coordinates are given with the input file option or fed from stdin, both the input and the output format is "x y" with one coordinate pair per line. Reverse transform is performed with the -r flag.
The format option determines how control points are printed out. A summary on the control points can be printed with the -s flag. The summary includes maximum deviation observed when transforming GCPs and overall RMS. The format option is ignored when coordinates are given with the input file option.
order=1:
e = [E0 E1][1].[1] [E2 0][e] [n] n = [N0 N1][1].[1] [N2 0][e] [n]
e = [E0 E1 E3][1 ] [1 ] [E2 E4 0][e ].[n ] [E5 0 0][e²] [n²] n = [N0 N1 N3][1 ] [1 ] [N2 N4 0][e ].[n ] [N5 0 0][e²] [n²]
e = [E0 E1 E3 E6][1 ] [1 ] [E2 E4 E7 0][e ].[n ] [E5 E8 0 0][e²] [n²] [E9 0 0 0][e³] [n³] n = [N0 N1 N3 N6][1 ] [1 ] [N2 N4 N7 0][e ].[n ] [N5 N8 0 0][e²] [n²] [N9 0 0 0][e³] [n³]
In other words, order=1 and order=2 are equivalent to order=3 with the higher coefficients equal to zero.
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