[Qgis-user] Fwd: Georeferencer Plugin Help - QGIS

[uclaros]

You can see the QGIS implementation in
https://github.com/qgis/QGIS/blob/7d1ca8161882cf03b9a384b6e294fc9ce5f45ed8/src/app/georeferencer/qgsgeorefmainwindow.cpp#L1451-L1495

It breaks down to error = std::sqrt( ( sumVxSquare + sumVySquare ) / (
nPointsEnabled - mGeorefTransform.getMinimumGCPCount() ) );

where:
 sumVxSquare is the sum of the squares of enabled points x residuals,
 sumVySquare is the sum of the squares of enabled points y residuals,
 nPointsEnabled is the number of enabled gcps,
 mGeorefTransform.getMinimumGCPCount() is 2 for linear and helmert, 3 for
polynomial_1, 6 for polynomial_2, 10 for polynomial_3, 4 for projective and
1 for TPS





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Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-User-f4125267.html