r.cats

NAME

r.cats - Prints category values and labels associated with user-specified raster map layers.
(GRASS Raster Program)

SYNOPSIS

r.cats
r.cats help
r.cats map=name [cats=range[,range,...]] [fs=character|space|tab] [vals=value]

DESCRIPTION

r.cats prints the category values and labels for the raster map layer specified by map=name to standard output.

The user can specify all needed parameters on the command line, and run the program non-interactively. If the user does not specify any categories (e.g., using the optional cats=range[,range,...] argument), then all the category values and labels for the named raster map layer that occur in the map are printed. The entire map is read, using r.describe, to determine which categories occur in the map. If a listing of categories is specified, then the labels for those categories only are printed. The cats may be specified as single category values, or as ranges of values. The user may also (optionally) specify that a field separator other than a space or tab be used to separate the category value from its corresponding category label in the output, by using the fs=character|space|tab option (see example below). If no field separator is specified by the user, a tab is used to separate these fields in the output, by default.

The output is sent to standard output in the form of one category per line, with the category value first on the line, then an ASCII TAB character (or whatever single character or space is specified using the fs parameter), then the label for the category.

If the user simply types r.cats without arguments on the command line the program prompts the user for parameter values using the standard GRASS parser interface.

Parameter:

vals=value: Comma separated value list: e.g. 1.4, 3.8, 13

EXAMPLES

r.cats map=soils: prints the values and labels associated with all of the categories in the soils raster map layer;
r.cats map=soils cats=10,12,15-20: prints only the category values and labels for soils map layer categories 10, 12, and 15 through 20; and
r.cats map=soils cats=10,20 fs= :: prints the values and labels for soils map layer categories 10 and 20, but uses ":" (instead of a tab) as the character separating the category values from the category values in the output.

Example output:

10:Dumps, mine, Cc
20:Kyle clay, KaA

NOTES

Any ASCII TAB characters which may be in the label are replaced by spaces.

The output from r.cats can be redirected into a file, or piped into another program.

AUTHOR

Michael Shapiro, U.S. Army Construction Engineering Research Laboratory