Finite Difference Gridding (FDG) is a gridding tool provided by EVS/MVS for situations in which standard gridding methods have proven less efficient and/or less practical.
Examples of where FDG can be used include:
Sparse or irregular data.
Varied clusters of data, specially, those taken around DNAPLs.
When trying to match a building's boundary to standard grid, FDG is the only tool that rotates a grid.
As a preprocessor for MODFLOW and MT3D, FDG is used for initial geological input for Groundwater Vistas.