Mathematics in Education, Research and Applications, MERAA online - banner

 

Creative Commons License

Mathematics in Education, Research and Applications (MERAA), 2017(3), 1


Back to Content

Published online 2017-12-04
DOI:http://dx.doi.org/10.15414/meraa.2017.03.01.11-16

B-spline surface for distribution of the agriculture soil moisture

Dušan Páleš, Jozef Rédl, Ivan Beloev
Slovak university of Agriculture in Nitra, Nitra, Slovak Republic

Article Fulltext (PDF), pp. 11–16

In the agricultural locality Pohranice were measured soil moisture values for the selected control points. Over these points we put the B-spline surface, which relatively detailed description we supply. On a simple example of 4 x 4 points we debugged program for generation of base functions. Furthermore, we verified process to generate knots of B-spline surface, which we subsequently used for the programming of the surface itself. In this manner formed algorithms we applied to 11 x 11 measured values of soil moisture. Discrete values of measurements were by clamped B-spline surface smoothed and its corner values constitute the edge measurement points. Evenly spaced points at a distance of 1 m in both directions slightly simplified the procedure, which can deal with irregular layout of points.

Keywords: basis functions, B-spline knots, surface fitting
JEL Classification: M55, N55