asciigrid function

read/write to/from (ESRI) asciigrid format

read/write to/from ESRI asciigrid format

read.asciigrid(fname, as.image = FALSE, plot.image = FALSE, colname = fname,
 proj4string = CRS(as.character(NA)))
write.asciigrid(x, fname, attr = 1, na.value = -9999, ...)

Arguments

• fname: file name
• as.image: logical; if FALSE, a list is returned, ready to be shown with the image command; if FALSE an object of class SpatialGridDataFrame-class is returned
• plot.image: logical; if TRUE, an image of the map is plotted
• colname: alternative name for data column if not file name
• proj4string: A CRS object setting the projection arguments of the Spatial Grid returned
• x: object of class SpatialGridDataFrame
• attr: attribute column; if missing, the first column is taken; a name or a column number may be given
• na.value: numeric; value given to missing valued cells in the resulting map
• ...: arguments passed to write.table , which is used to write the numeric data

Returns

read.asciigrid returns the grid map read; either as an object of class SpatialGridDataFrame-class or, if as.image is TRUE, as list with components x, y and z.

See Also

as.image.SpatialGridDataFrame , image

Author(s)

Edzer Pebesma

Examples

x <- read.asciigrid(system.file("external/test.ag", package="sp")[1])
class(x)
image(x)