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man page of g.transform

g.transform: Computes a coordinate transformation based on the control points.

g.transform - Computes a coordinate transformation based on the control points.


general, transformation, GCP


g.transform g.transform help g.transform [-srx] group=name order=integer [format=string[,string,...]] [coords=name] [--verbose] [--quiet] Flags: -s Display summary information -r Reverse transform of coords file or coeff. dump Target east,north coordinates to local x,y -x Display transform matrix coefficients --verbose Verbose module output --quiet Quiet module output Parameters: group=name Name of input imagery group order=integer Rectification polynomial order Options: 1-3 format=string[,string,...] Output format Options: idx,src,dst,fwd,rev,fxy,rxy,fd,rd Default: fd,rd idx: point index src: source coordinates dst: destination coordinates fwd: forward coordinates (destination) rev: reverse coordinates (source) fxy: forward coordinates difference (destination) rxy: reverse coordinates difference (source) fd: forward error (destination) rd: reverse error (source) coords=name File containing coordinates to transform ("-" to read from stdin) Local x,y coordinates to target east,north


g.transform is an utility to compute transformation based upon GCPs and output error measurements.


For coordinates given with the coords file option or fed from stdin, the input format is "x y" with one coordinate pair per line. The transformations are: order=1: e = [E0 E1][1].[1] [E2 0][e] [n] n = [N0 N1][1].[1] [N2 0][e] [n] order=2: 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] order=3: 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] ["." = dot-product, (AE).N = N'EA.] In other words, order=1 and order=2 are equivalent to order=3 with the higher coefficients equal to zero.
Brian J. Buckley Glynn Clements Hamish Bowman Last changed: $Date: 2010-09-18 21:44:46 +0200 (Sat, 18 Sep 2010) $ Full index (C) 2003-2010 GRASS Development Team G.TRANSFORM(1)

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