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MAP PROJECTIONS USED IN ROMANIA FOR MILITARY PURPOSES: LAMBERT-CHOLESKY AND GAUSS- KRUGER
Abstract
The current article presents two map projections used in Romania mainly for military purposes, namely Lambert-Cholesky (from 1917 to 1931) and Gauss-KrпїЅger (from 1955 to 1971). After a brief description of their individual characteristics and particularities of application in our country, a comparison of the distortions produced by both projections was presented in order to emphasise their various advantages. The accuracy of relief representation using contour lines on maps drawn to scales of 1:20,000 and 1:25,000 in the above projections were also subjected to comparison. Both map projections presented therein are conformal. Therefore, with regards to their linear and areal distortions for Romanian territories, they are negative in the Lambert- Cholesky projection and positive in the Gauss-KrпїЅger projection. The absolute values of the distortions are almost double in the Lambert-Cholesky projection compared to Gauss-KrпїЅger. In order to compare the accuracy of relief representation, ten transverse profiles were made between the same points identified on maps in both projections. Only minor differences were observed, proving that the elevations were determined by comparable methods in terms of accuracy.
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References7
Calistru, V., Munteanu, C., Cartografie matematica, Institutul de Constructii Bucuresti; Bucharest, 1974, pp 231-232.
Brezinski, C., Tournès, D., André-Louis Cholesky: Mathematician, Topographer and Army Officer; Springer International Publishing; Switzerland, 2014, pp 32-33.
Munteanu, C., Cartografie matematica, Matrix Rom, Bucharest 2003, pp. 182-183.
Deetz, C., The Lambert conformal conic projection with two standard parallels, Washington Government Printing Office; Washington, 1918.
The military topographic map L-35-129-C-c, third edition, Direcția Topografică Militară, Bucharest, 1991.
Fire plan in the Lambert projection – Cernavoda town (5343), scale 1 : 20.000, Serviciul Geografic al Armatei, Bucharest, 1928.
Clinci, T. S., Badea, A. C., Badea, G., Evolution of Geodesy and Cartography in Romania, pp. 191 – 198, 13th International Multidisciplinary Scientific Geoconference SGEM 2013, 16-22 June, 2013, Albena Co., Bulgaria, Conference Proceedings, volume II, Section Geodesy and Mine Surveying, ISBN 978-619-7105-01-8, ISSN 1314-2704, DOI: 10.5593/SGEM2013/BB2.V2/S09.025.
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