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DISTORTION ANALYSIS OF MAP PROJECTIONS

AUTHOR/S: O. S. KIRTILOGLU, I. B. GUNDOGDU
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 995-1002 pp

ABSTRACT

In this study, analysis and visualization of map projection distortions have been
discussed. For the realization of the distortion analysis in practice, an auxiliary program
was developed by MATLAB program, to calculate the amount of distortion. At the
stage of the calculation of distortion the world map projections have been focused on
and equations of these projections have been used. The points of interest were chosen
as the intersection points of the geographic network of the original surface. 5ox5o
geographic network intersection points were taken into consideration for the visual
analysis can be performed in a consistent way. The calculated distortion values are; the
maximum linear distortion at any point a, the minimum linear distortion at any point b,
linear distortion along the parallel k, linear distortion along the meridian h, maximum
angular distortion ω and the areal distortion value p. In this context, Tissot indicatrix,
isograms method, color method and the use of graticule in analysis have been discussed
and implemented to selected projections. To visualize the amount and distribution of
distortions of map projections, MapInfo 8.5 Professional software and its tool Vertical
Mapper 2.1 have been used. A detailed comparison of selected projections has been
carried out with the obtained results. As a result of the comparisons, which world map
projection is more appropriate for the purposes has been examined.

Keywords: Cartography, Map Projections, Map Projection Deformations, Tissot Indicatrix, Deformation Analysis

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