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The groundwater example requires quadrivariate interpolation because the observations are scattered in three-dimensional space and also vary over time. This involves four variables: three spatial dimensions and time.

Conditions: Input values are measured at 3D points over time.; Output is a 4D raster combining 3D space and time.

The groundwater example requires quadrivariate interpolation because the observations are scattered in three-dimensional space and also vary over time. This involves four variables: three spatial dimensions and time.

Conditions: Input values are measured at 3D points over time.; Output is a 4D raster combining 3D space and time.