Color Figures from Geographical Information Systems, Second Edition (32 of 67)

Plate 31 Influence of tension on the surface (a–c) and volume (d–f) models of nitrogen concentrations in the middle section of Chesapeake Bay. Low tension (a, d) leads to overshoots; high tension (c, f) creates extrema in data points. Appropriate tension (b, e) was found by minimising the cross-validation error.