Hi, My guess is because the Scale While Moving option is set to Fit and at one location you have some outlier points or a features at the top or bottom of the road (e.g. : electrical wires). Indeed when Fit is selected, the Model By Section tool will try to fit vertically and horizontally the points available at that section location. Since there is no vertical limit any points encounter vertically, even far away from the feature in the point cloud you try to model will influence the position of that feature. To change that behavior just use Preserve Scale instead. Thanks, Mathieu
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