envi_files: ENVI File Manipulation

In nplatonov/ursa: Non-Interactive Spatial Tools for Raster Processing and Visualization

ENVI File Manipulation

Description

Management of ENVI files similar to functions of OS file manager.

Usage

envi_exists(pattern = ".+", path = ".", all.files = FALSE, full.names = TRUE,
           recursive = FALSE, ignore.case = TRUE, exact = FALSE)
envi_list(pattern = ".+", path = ".", all.files = FALSE, full.names = recursive,
          recursive = FALSE, ignore.case = TRUE, exact = FALSE)
envi_remove(pattern = ".+", path = ".", all.files = FALSE, full.names = recursive,
            recursive = FALSE, ignore.case = TRUE, verbose = FALSE)
envi_copy(src, dst, overwrite = TRUE)
envi_rename(src, dst, overwrite = TRUE)

ursa_exists(fname)

Arguments

pattern	Either filename (like basename function) or mask in format of regular expressions or full path name.
path	Either path name (like dirname function) or ignored if pattern describes full path.
all.files	A logical value. If FALSE, only the names of visible files are returned. If TRUE, all file names will be returned. Similar to all.files argument in list.files function
full.names	A logical value. If TRUE, the directory path is prepended to the file names to give a relative file path. If FALSE, the file names (rather than paths) are returned. Similar to full.names argument in list.files function
recursive	Logical. Should the listing recurse into directories? Similar to recursive argument in list.files function
ignore.case	Logical. Should pattern-matching be case-insensitive? Similar to ignore.case argument in list.files function
exact	Logical. Attempt to cancel regular expressions.
verbose	Logical. TRUE provides some additional information on console.
src	Strings of length 1 or more. Name or directory name or path of source ENVI files.
dst	Strings of length 1 or more. Name or directory name path of destination ENVI files. Length is assuming to be equal to length of src
overwrite	Logical. TRUE overwrites destinations ENVI files. FALSE does nothing if destinaton ENVI file exists.
fname	Character. Full file name or file pattern with file path.

Details

Functions do not view content of any files. The major identifier of ENVI files in file system is ENVI header (*.hdr) file. Binary file is searching along 1) original *.envi, *.bin, *.img, *.dat extensions, 2) externally packing *.gz. *.bz2, *.xz extensions, or 3) packed by this package *.envigz, *.bingz extensions. Functions envi_copy() and envi_rename() keeps original extension of ENVI binary file; use file.rename to rename ENVI binary file.

Value

envi_exists() returns integer number of found ENVI files.

envi_list() returns character vector of found ENVI files.

envi_remove() returns character vector of deleted ENVI files.

envi_copy() returns 0L.

envi_rename() returns value of file.rename, which is applied to objects in file system.

ursa_exists() returs TRUE if any *.tif, *.tiff, *.bin, *.hfa file is found.

Author(s)

Nikita Platonov [e-mail]

Examples

session_grid(NULL)
wd <- setwd(tempdir())
a1 <- create_envi("tmp1.envi")
a2 <- create_envi("tmp2.")
close(a1,a2)
envi_list()
envi_copy("tmp1","tmp3")
envi_copy("tmp2","tmp4")
envi_list()
envi_rename("tmp3","tmp5")
envi_list()
envi_exists("nofilewithsuchname")
envi_exists("tmp[34]")
envi_remove(".+")
envi_list()
setwd(wd)

nplatonov/ursa documentation built on May 8, 2024, 6:02 p.m.