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<em>i.ortho.transform</em> is an utility to compute transformation
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based upon GCPs and output error measurements.
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For coordinates given with the <b>coords</b> file option or fed from
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<tt>stdin</tt>, the input format is "x y" with one coordinate pair per
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<p>The transformations are:
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<div class="code"><pre>
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<div class="code"><pre>
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e = [E0 E1 E3][1 ] [1 ]
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[E5 0 0][e²] [n²]
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n = [N0 N1 N3][1 ] [1 ]
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[N5 0 0][e²] [n²]
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<div class="code"><pre>
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e = [E0 E1 E3 E6][1 ] [1 ]
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[E5 E8 0 0][e²] [n²]
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[E9 0 0 0][e³] [n³]
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n = [N0 N1 N3 N6][1 ] [1 ]
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[N5 N8 0 0][e²] [n²]
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[N9 0 0 0][e³] [n³]
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["." = dot-product, (AE).N = N'EA.]
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<p>In other words, order=1 and order=2 are equivalent to order=3 with
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the higher coefficients equal to zero.
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<em><a href="i.rectify.html">i.rectify</a></em>
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<p><i>Last changed: $Date: 2013-02-20 02:16:02 -0800 (Wed, 20 Feb 2013) $</i>