Interpolation by regularized spline with tension: II. Application to terrain modeling and surface geometry analysis |
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| Authors: | Helena Mitáová and Jaroslav Hofierka |
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| Institution: | (1) Illinois Natural History Survey, 607 East Peabody Drive, 61820 Champaign, Illinois;(2) Department of Physical Geography and Cartography, Comenius University, 84215 Bratislava, Czechoslovakia |
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| Abstract: | A general approach to the computation of basic topographic parameters independent of the spatial distribution of given elevation data is developed. The approach is based on an interpolation function with regular first and second order derivatives and on application of basic principles of differential geometry. General equations for computation of profile, plan, and tangential curvatures are derived. A new algorithm for construction of slope curves is developed using a combined grid and vector approach. Resulting slope curves better fulfill the condition of orthogonality to contours than standard grid algorithms. Presented methods are applied to topographic analysis of a watershed in central Illinois. |
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| Keywords: | topographic analysis curvatures flow lines |
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