Feature request #2731
Show residual in georeferencer in map units (if possible)
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The following patch shows the residuals in the gcp table in map units where possible and in pixels else. Because interpretation about the gcp errors is easier with map units, so the patch converts pixels->map units for linear transformation and helmert. For the other transformations, conversion to map units is not so straightforward, therefore they are kept in pixels.
#2 Updated by mmassing - over 7 years ago
- Status changed from Open to In Progress
Applied in 4d46f190 (SVN r13553) - thanks, Marco.
I'll leave the ticket open for now, because I'd eventually like to add this functionality for
the higher order transform types (linearization via jacobi matrix or numerical approximation of
the derivatives), and also a config option to choose the desired units.
I think the latter is useful because reporting residuals in pixel units shows if residuals
are in the ballpark of input discretization, whereas map units are useful to better get an estimate of absolute error.