A Numerical Implementation of Interval-Valued Kriging
Distance matrix calculation.
Extract subset of an intsp or intgrd object
Function to create a variogram object for interval-valued data.
Print the head of an intgrd object.
Print the head of an intsp object.
Function to reassign the contents of the interval slot
Function to extract the interval of an intsp or intgrd object
Convert intgrd or intsp object back to a data frame
An interval extension of a SpatialPixelsDataFrame
INTERVAL-VALUED KRIGING MODELS IN R
Algorithmic implementation of interval valued kriging.
An interval extension of a SpatialPointsDataFrame
Function to fit empirical variograms for an interval-valued spatial ob...
Function to visualize the three variograms from an interval valued spa...
Create an interval plot for spatial grid.
Create an interval plot for spatial points.
Print the contents of an intgrd object
Print the contents of an intsp object
Print the object summary to the screen.
Print the object summary to the screen.
Extension of the show function for intgrd objects
Extension of the show function for intgrd objects
Summarize the contents of an intgrd object, including special summar...
Summarize the contents of an intsp object, including special summari...
Print the tail of an intgrd object.
Print the tail of an intsp object.
An interval-valued extension of ordinary and simple kriging. Optimization of the function is based on a generalized interval distance. This creates a non-differentiable cost function that requires a differentiable approximation to the absolute value function. This differentiable approximation is optimized using a Newton-Raphson algorithm with a penalty function to impose the constraints. Analyses in the package are driven by the 'intsp' and 'intgrd' classes, which are interval-valued extensions of 'SpatialPointsDataFrame' and 'SpatialPixelsDataFrame' respectively. The package includes several wrappers to functions in the 'gstat' and 'sp' packages.