Dear Colleagues,

As public or private archives started digitally publishing their maps, the enormous information content of ancient maps became available for the wider public. However, as these maps have spatial information, the search engines are not able to index them, and the proper form of publishing these maps is via GIS or WMS (Web Mapping Service) applications, and this type of publication requires georeferencing. As these maps were produced in different times, their scale, projection, accuracy, and production techniques are very different, so the georeferencing procedure requires a wide scale of applicable methods.

These methods vary from ground control point (GCP)-based polynomial transformations of individual maps to the map-to-map transformation of a series of adjacent map sheets requiring the definition of the map projection and geodetic datum in the GIS software. Besides these methods, any hybrid method combining existing methods or introducing new applications might provide a digital product that meets (or in some cases almost meets) the expected map accuracy standard. Quality control and metadata definition both emerge as important issues in georeferencing.

Any contributions focusing on methodology or any case studies, also in combination with conclusions in environmental history, demonstrating the feasibility of methods are welcomed in this Special Issue. The submissions which cover but are not limited to:

• Control point selection strategies
• Transformations used for georeferencing (affine, similarity, higher degree polynomial or any type of transformations)
• Map projection and/or map datum parameters (calculation and accuracy)
• Comparing different georeferencing strategies (work effort VS. accuracy)
• Web publishing of georeferenced historical maps (WMS, individual sites, standards)
• Application of georeferenced historical maps in environmental studies

Dr. Gábor Molnár
Prof. Dr. Gábor Timár
Guest Editors

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• map projection
• geodetic datum
• datum transformation
• parameter estimation
• ground control point (GCP)
• polynomial transformation