Geodesic
Construction of isoline maps of functions of two variables
Numerical methods and programming, Tome 1 (2000) no. 2, pp. 15-23.

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Some questions on construction and treatment of level lines of real functions of two variables are considered. Parametric two-dimensional splines are used to smooth isolines. An algorithm for constructing profiles of functions of two variables is proposed. The reconstruction of a function is discussed for the case when a family of its isolines of different levels is given.
Keywords: isolines of functions, parametric splines, recovery of functions using isolines, smoothing of isolines, mapping problems. 
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     author = {L. G. Beliovskaya and N. A. Bogomolov and A. D. Kovalev},
     title = {Construction of isoline maps of functions of two variables},
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     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMP_2000_1_2_a2/}
}
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L. G. Beliovskaya; N. A. Bogomolov; A. D. Kovalev. Construction of isoline maps of functions of two variables. Numerical methods and programming, Tome 1 (2000) no. 2, pp. 15-23. http://geodesic.mathdoc.fr/item/VMP_2000_1_2_a2/