Freehand Vector Georeferencer
Plugin ID: 5458
An intuitive georeferencing (coordinate-correction) tool for vector layers. Grab an old node and release it at the new position to add control points, preview the Helmert/Affine transform in real time, and apply the result as a new layer, as features added to the current layer, or as an in-place edit.
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Align survey/CAD-derived vector data to known points with a direct, PowerPoint-like feel (move, rotate, scale). No numeric input is required: control points (GCPs) are added with the mouse only. Press an old node and release at the new position to add a GCP; click an existing GCP to include/exclude it from the fit, or drag it to move its destination. Sources and destinations snap to the vertices of any visible vector layer (including the target itself), and a source may also be a free point. Transforms: Helmert (fixed scale or with scale) and Affine. The transformed geometry is previewed in real time while dragging, with adjustable preview FPS and vertex decimation for heavy data. Per-GCP X/Y error, overall RMS, standard deviation and scale factor are shown; residuals are colored green-to-red and the list is sortable. Apply as a new layer, as features added to the current layer, or as an in-place edit (add/edit run in edit mode, so Ctrl+Z undoes them and nothing is committed until you save). GCPs can be saved/loaded as CSV to reuse the same transform on another layer in the same CRS, and a temporary CSV is written on every apply. Same-CRS workflow only (no reprojection): keep the layer CRS and the project CRS identical; a warning is shown when they differ. Acknowledgment: the interactive UI (grab a node and move it to add control points) is inspired by the "Freehand Raster Georeferencer" plugin by Guilhem Vellut (https://github.com/gvellut/FreehandRasterGeoreferencer); licensed under GPL v2 or later, this plugin is distributed under GPL v3.
