Methods
Gridding with stacked continuous curvature splines
in tension
The gridding method presented here is based on using
interpolation with splines in tension at various resolutions
decided according to source data density. The method
allows gridding parameters, such as the tension factor, to
be adjusted individually for each grid resolution. Each grid
is essentially compiled using the same approach as the
examples given by Smith and Wessel (1990), however,
with some important differences concerning how areas
with sparse data are treated