DBPapers
DOI: 10.5593/SGEM2014/B23/S11.122

THE INFLUENCE OF THE DISTRIBUTION OF GROUND CONTROL POINTS ON GEOREFERENCING

J. Havlicek, J. Cajthaml
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-12-4 / ISSN 1314-2704, June 19-25, 2014, Book 2, Vol. 3, 965-972 pp

ABSTRACT
The article presents information about one of the problematic aspects of georeferencing old maps, which is the layout of grounds control points. The transfer issue of old paper maps into a digital form and publishing them on the internet is still a hot topic, involving a number of professional cartographic companies, universities and government institutions. Old maps are a phenomenon for both the professional community and the general public. Old maps are currently being published as web services, and the user can compare the evolution of landscape in different historical periods. The most important act of publishing old maps on the internet is the georeferencing of scanned maps. Most cartographers georeference without giving adequate attention to choosing the appropriate distribution of grounds control points and without selecting the appropriate map projection. The article deals with the possibility of determining whether grounds control points are appropriately distributed across the map drawing. Old maps very often have a local distortion (shrinkage of paper, connection of individual drawings, etc.), therefore, the article describes the creation of a source code in MATLAB, which should draw attention to inappropriately located ground control points. It is important that the number of grounds control points in each section of a map is approximately the same. Another important indication is that the grounds control points are not too densely placed (e.g. choice of ground control points at one building, etc.), or the grounds control point are not too far from each other.

Keywords: Georeferencing, ground control point, transformation

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