asc.from.raster: Raster conversion functions for adehabitat, raster, terra and...

In jeffreyevans/landmetrics: Legacy landscape metrics from spatialEco

Raster conversion functions for adehabitat, raster, terra and sp packages

Description

Raster conversion functions for adehabitat, raster, terra and sp packages

Usage

asc.from.raster(x)

raster.from.asc(x, projs = NA)

asc.from.sp(x)

sp.from.asc(x, projs = sp::CRS(as.character(NA)))

as.asc(
  x,
  xll = 1,
  yll = 1,
  cellsize = 1,
  type = c("numeric", "factor"),
  lev = levels(factor(x))
)

Arguments

x	is an object of class 'asc', 'RasterLayer' 'SpatRast', or 'SpatialGridDataFrame'. For the function as.asc, a matrix
projs	is a CRS projection string of the Proj4 package
xll	the x coordinate of the center of the lower left pixel of the map
yll	the y coordinate of the center of the lower left pixel of the map
cellsize	the size of a pixel on the studied map
type	a character string. Either "numeric" or "factor"
lev	if type = "factor", either a vector giving the labels of the factor levels, or the name of a file giving the correspondence table of the map see adehabitat as.asc helpfile details

Value

Returns an object of class requested.

Note

asc.from.raster and asc.from.sp extracts data from objects of class 'RasterLayer' (raster package) and class 'SpatialGridDataFrame' (sp package) into an object of class 'asc' (adehabitat packages). raster.from.asc and sp.from.asc does the reverse. as.asc creates an object of class 'asc' (adehabitat packages) from a matrix of data. Code and helpfile associated with as.asc were modified from adehabitat package.

These functions provide capabilities of using functions from many packages including adehabitat, sp (plus e.g., maptools, rgdal) and raster.

Author(s)

Jeremy VanDerWal (depreciated/orphaned SDMTools package) and Jeffrey S. Evans

Examples

library(sp)
library(raster)

#create a simple object of class 'asc'
tasc = as.asc(matrix(rep(x=1:10, times=1000),nr=100))
  print(tasc)
  str(tasc)

#convert to RasterLayer
traster = raster.from.asc(tasc)
str(traster)

#convert to SpatialGridDataFrame
tgrid = sp.from.asc(tasc)
str(tgrid)

#create a basic object of class asc
( tasc = as.asc(matrix(rep(x=1:10, times=1000),nr=100)) )

jeffreyevans/landmetrics documentation built on Nov. 14, 2023, 3:13 p.m.