SpatialSpectraDataFrame: Constructor for the SpatialSpectraDataFrame class.

In inspectr: Storing, manipulating and analysis spectroscopy and associated data in R.

Description

Constructor for the SpatialSpectraDataFrame class. Creates a SpatialSpectraDataFrame object from scratch.

Usage

SpatialSpectraDataFrame(coords, nir, data, coords.nrs = numeric(0), proj4string = CRS(as.character(NA)), match.ID = TRUE, bbox=NULL, wl=numeric(), id=data.frame(id=NA), units="nm")

Arguments

wl	a numeric vector giving the wavelengths at with the spectra have been measured
nir	a "matrix" or a "data.frame" object giving the spectra values for each sample
id	a vector giving the unique id of each sample in the collection
units	a character giving the unit in which the wavelengths values are expressed
data	object of class "data.frame" containing the attribute data
coords	numeric matrix or data.frame with coordinates (each row is a point)
proj4string	projection string of class CRS-class
bbox	bounding box matrix, usually NULL and constructed from the data, but may be passed through for coercion purposes if clearly needed
coords.nrs	numeric; if present, records the column positions where in data the coordinates were taken from (used by coordinates<-)
match.ID	logical; if TRUE AND coords has rownames (i.e., coerced to a matrix, dimnames(coords)[[2]] is not NULL), AND data has row.names (i.e. is a data.frame), then the SpatialSpectraDataFrame object is formed by matching the row names of both components, leaving the order of the coordinates in tact. Checks are done to see whether both row names are sufficiently unique, and all data are matched. If FALSE, coordinates and data are simply "glued" together. If character: indicates the column in data with coordinates IDs to match

Value

a new "SpatialSpectraDataFrame" object

Author(s)

Pierre Roudier [e-mail]

See Also

spectra, wl, SpatialSpectraDataFrame-class

Examples

  # Creating a SpatialSpectraDataFrame object from scratch
  my.wl <- 350:2500
  my.id <- LETTERS[1:4]
  my.nir <- matrix(runif(4*length(my.wl)), nrow=4)
  my.data <- data.frame(foo = runif(4), bar = LETTERS[1:4])
  my.coords <- matrix(runif(4), runif(4), ncol=2, nrow=4)

  my.ssdf <- SpatialSpectraDataFrame(wl = my.wl, nir = my.nir, id = my.id, data = my.data, coords = my.coords)

inspectr documentation built on May 2, 2019, 5:45 p.m.