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Read coordinates of points on a habitat mask from a text file.
read.mask(file = NULL, data = NULL, spacing = NULL, columns = NULL, ...)object of class mask with type `user'
character string with name of text file
dataframe
spacing of grid points in metres
character vector naming the columns to save as covariates
other arguments to pass to read.table
For file input, the x and y coordinates are usually the first two values
on each line, separated by white space. If the file starts with a line
of column headers and `header = TRUE' is passed to read.table in
the ... argument then `x' and `y' need not be the first two fields.
data is an alternative input route if the x and y coordinates
already exist in R as columns in a dataframe. Only one of data
or file should be specified.
The grid cell size spacing should be provided if known. If it is
not provided then an attempt is made to infer it from the minimum
spacing of points. This can be slow and may demand more memory than is
available. In rare cases (highly fragmented masks) it may also yield the
wrong answer.
From 2.3.0, additional columns in the input are saved as covariates. The
default (columns = NULL) is to save all columns.
mask
## Replace file name with a valid local name and remove `#'
# read.mask (file = "c:\\myfolder\\mask.txt",
# spacing = 3, header = TRUE)
## "mask.txt" should have lines like this
# x y
# 265 265
# 268 265
# ...
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