Visualization of landscape characterization
data as multivariate fields
modeled by bi, tri, and quadvariate Regularized Spline with Tension 
phenomenon (field) 
point data 
3D dynamic map 
elevation: z=f(x,y);
single surface 


precipitation: p_{i}=f_{i}(x,y); i=1,...,12;
time series of surfaces 


soil horizons: z_{i}=f_{i}(x,y); i=1,...,5;
vertical series of surfaces 


soil pH: pH=f(x,y,z); single volume 


concentrations of nitrogen in water: w=f(x,y,z,t); volume
evolving in time (jandec) 

