While we assume that these small differences will be insignificant in the application to a property characterization, we do want to understand and hopefully reduce or remove them. A roof’s eave causes a small parallel shift vis-à-vis the cadastral data to make them fit the segmentation result. The inconsistencies from bay windows or balconies also would disappear if one were to redraw the classification boundaries. These interventions would affect the classification results and rate of misclassifications. These considerations create the need for methods to automatically improve the alignment of the cadastral line work and the segmentation boundaries. This could be possible e.g., by using a variational boundary regularization. Until such algorithms are developed and implemented, we perform such minor improvements by hand. Figure 10 illustrates the discrepancies and their removal.