interpol: Interpolate from source to target locations
In tpilz/telemac: R Interface to the TELEMAC Model Suite

Description Usage Arguments Details Value

Interpolates values from source to target location using inverse distance weighting (IDW) of nearest neighbours.

interpol(trg, src, ...)

## S3 method for class 'SpatialPoints'
interpol(trg, src, ..., z, n = 5, output = "sp")

## S3 method for class 'matrix'
interpol(trg, src, ..., n = 5, output = "numeric")

## S3 method for class 'data.frame'
interpol(trg, src, ..., n = 5, output = "data.frame")

## S3 method for class 't2d_tin'
interpol(trg, src, ..., n = 5, output = "numeric")

`trg`	The target locations. Either: a `matrix` or `data.frame` with x and y coordinates; an object of class `SpatialPoints`; an object of class `t2d_tin`.
`src`	The source locations. Either: a `matrix` with x and y coordinates (argument `z` as to be provided); a `data.frame` with x and y coordinates and the variable of interest (`"z"`); an object of class `SpatialPointsDataFrame`, `raster`, or stars (only the first attribute is taken).
`...`	Further arguments passed to `idw`.
`z`	If `src` is a `matrix`: `numeric` vector of values at `src` locations to be interpolated to `trg` locations.
`n`	The number of nearest neighbours used for interpolation (default is 5).
`output`	The type of output: `numeric`, `sp`, or `data.frame` (see below).

Function calls idw. You can pass further arguments to that function, e.g. idp to influence the distance-based weighting of neighbours (default is 2).

output = "numeric": a vector of values interpolated to trg locations.

output = "data.frame": a data.frame with x and y coordinates of trg location and interpolated values ("z").

output = "sp": an object of class SpatialPointsDataFrame with the interpolated values at trg locations.

tpilz/telemac documentation built on Feb. 10, 2022, 2:12 p.m.