Analysis of Several Map Georeferencing Methods
Analysis of Several Map Georeferencing Methods

Summary/Abstract: Whenever one derives maps in other projections and at other scales compared to the base maps, the latter must be georeferenced. In the present article, we have studied multiple georeferencing methods employed through a series of professional applications such as AutoCAD Raster Design, AutoCAD Map 3D, ArcGIS Pro and QGIS, with the aim of making an educated choice with regards to their individual use cases. The residual errors obtained in the control points were analysed by applying different methods of transforming the Cartesian coordinates used in the georeferencing of a scanned map. For georeferencing, we used polynomial transformation with different order polynomials, a triangular method, adjustment transformation, spline transformation and similarity. For each method described above, the distances between the source and destination points were measured, reduced at the map scale and compared to the graphical precision of measuring a distance on a map. The present study centralizes the results obtained when using different georeferencing methods and can act as an aid for students or any party interested in georeferencing scanned images to create maps or perform different analyses based on georeferenced images.

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