raster: layerize – R documentation

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layerize

Layerize

Description

Create a RasterBrick with a Boolean layer for each class (value, or subset of the values) in a RasterLayer. For example, if the cell values of a RasterLayer indicate what vegetation type they are, this function will create a layer (presence/absence; dummy variable) for each of these classes. Classes and cell values are always truncated to integers.

You can supply a second spatially overlapping RasterLayer with larger cells (do not use smaller cells!). In this case the cell values are counts for each class. A similar result might be obtained more efficiently by using layerize with a single RasterLayer followed by aggregate(x, , sum).

Usage

## S4 method for signature 'RasterLayer,missing'
layerize(x, classes=NULL, falseNA=FALSE, filename='', ...)

## S4 method for signature 'RasterLayer,RasterLayer'
layerize(x, y, classes=NULL, filename='', ...)

Arguments

`x`	RasterLayer
`y`	RasterLayer or missing
`classes`	numeric. The values (classes) for which layers should be made. If `NULL` all classes are used
`falseNA`	logical. If `TRUE`, cells that are not of the class represented by a layer are `NA` rather then `FALSE`
`filename`	character. Output filename (optional)
`...`	Additional arguments as for `writeRaster`

Value

RasterBrick

Examples

r <- raster(nrow=20, ncol=20)
values(r) <- c(rep(NA, 50), rep(1:5, 70))
b <- layerize(r)

r2 <- raster(nrow=5, ncol=5)
b2 <- layerize(r, r2)

raster

Geographic Data Analysis and Modeling

v3.4-10

GPL (>= 3)

Authors

Robert J. Hijmans [cre, aut] (<https://orcid.org/0000-0001-5872-2872>), Jacob van Etten [ctb], Michael Sumner [ctb], Joe Cheng [ctb], Dan Baston [ctb], Andrew Bevan [ctb], Roger Bivand [ctb], Lorenzo Busetto [ctb], Mort Canty [ctb], Ben Fasoli [ctb], David Forrest [ctb], Aniruddha Ghosh [ctb], Duncan Golicher [ctb], Josh Gray [ctb], Jonathan A. Greenberg [ctb], Paul Hiemstra [ctb], Kassel Hingee [ctb], Institute for Mathematics Applied Geosciences [cph], Charles Karney [ctb], Matteo Mattiuzzi [ctb], Steven Mosher [ctb], Babak Naimi [ctb], Jakub Nowosad [ctb], Edzer Pebesma [ctb], Oscar Perpinan Lamigueiro [ctb], Etienne B. Racine [ctb], Barry Rowlingson [ctb], Ashton Shortridge [ctb], Bill Venables [ctb], Rafael Wueest [ctb]

Initial release

2021-05-02