NAME¶
r.describe - Prints terse list of category values found in a
raster map layer.
KEYWORDS¶
raster, metadata
SYNOPSIS¶
r.describe
r.describe help
r.describe [-
1rndiq]
map=
name
[
nv=
string] [
nsteps=
integer] [--
verbose]
[--
quiet]
Flags:¶
- -1
-
Print the output one value per line
- -r
-
Only print the range of the data
- -n
-
Suppress reporting of any NULLs
- -d
-
Use the current region
- -i
-
Read fp map as integer
- -q
-
Run quietly
- --verbose
-
Verbose module output
- --quiet
-
Quiet module output
Parameters:¶
- map=name
-
Name of input raster map
- nv=string
-
String representing no data cell value
Default: *
- nsteps=integer
-
Number of quantization steps
Default: 255
DESCRIPTION¶
r.describe prints a terse listing of category values found in a
user-specified raster map layer.
r.describe ignores the current geographic region and mask, and
reads the full extent of the input raster map. This functionality is useful if
the user intends to
reclassify or
rescale the data, since these
functions (
r.reclass and
r.rescale) also ignore the current
geographic region and
mask.
The
nv parameter sets the string to be used to represent NULL
values in the module output; the default is '*'.
The
nsteps parameter sets the number of quantisation steps to
divide into the input raster map.
NOTES¶
FLAGS¶
If the user selects the
-r flag, a range of category values found in the
raster map layer will be printed. The range is divided into three groups:
negative, positive, and zero. If negative values occur, the minimum and
maximum negative values will be printed. If positive values occur, the minimum
and maximum positive values will be printed. If zero occurs, this will be
indicated. The range report will generally run faster than the full list (the
default output).
The
-d flag can be used to force
r.describe to respect the current
region extents when repoting raster map categories. The default behavior is to
read the full extent of the input raster map.
If the
-1 flag is specified, the output appears with one category
value/range per line.
The
-n flag suppresses the reporting of NULL values.
EXAMPLES¶
The following examples are from the Spearfish60 sample Location:
# Print the full list of raster map categories:
r.describe landcover.30m
* 11 21-23 31 32 41-43 51 71 81-83 85 91 92
# Print the raster range only:
r.describe -r landcover.30m
11 thru 92
*
# Print raster map category range, suppressing nulls:
r.describe -n landcover.30m
11 21-23 31 32 41-43 51 71 81-83 85 91 92
# Print raster map categories, one category per line:
r.describe -1 geology
*
1
2
3
4
5
6
7
8
9
SEE ALSO¶
g.region, r.mask, r.reclass, r.report,
r.rescale, r.stats, r.univar
AUTHOR¶
Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
Last changed: $Date: 2008-05-16 21:09:06 +0200 (Fri, 16 May 2008) $
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