BilinearInterpolation

Bilinear{V,I}

This struct stores the source and target grids for bilinear interpolation on a rectangular grid. Indexes specifying the location of the target points in the source grid are also stored for enabling efficient implementation of bilinear interpolation.

Fields

• sourcex: Source grid in x direction (nsourcex)

• sourcey: Source grid in y direction (nsourcey)

• targetx: Target grid in x direction (ntargetx)

• targety: Target grid in y direction (ntargety)

• startx: left index of location of a target x grid point in source x grid

• starty: left index of location of a target y grid point in source y grid

interpolatebilinear!(
    ftarget::AbstractArray{FT,N},
    bilinear::B,
    fsource::AbstractArray{FT,N},
) where {FT,N,B}

Interpolate fsource, defined on source grid, onto the target grid. The horizontal source and target grids are defined in bilinear. Here fsource is an N-dimensional array where the last two dimensions are assumed to be horizontal dimensions.

For example, fsource can be of size [n1, n2..., nx, ny], where nx and ny are the horizontal dimensions. Single horizontal level is also supported. The number of horizontal levels should be same for both source and target arrays.

https://en.wikipedia.org/wiki/Bilinear_interpolation

set_source_range!(
    start::AbstractVector{I},
    source::AbstractVector{FT},
    target::AbstractVector{FT},
) where {I, FT}

This function populates the 1D integer array start which provides the left indices of locations of target points inside the source grid specified by the 1D array source.

get_stencil_left_idx(alg::Linear, sourcegrid, targetpoint; first = 1)

Return the left index of location of targetpoint point in sourcegrid grid.