d.rast.num(1grass)

NAME
d.rast.num - Overlays cell category values on a raster map displayed in the active graphics frame.

KEYWORDS
display, map annotations, raster

SYNOPSIS
d.rast.num
d.rast.num --help
d.rast.num [-af] map=name [text_color=name] [grid_color=name] [precision=integer] [font=string] [path=name] [charset=string] [--help] [--verbose] [--quiet] [--ui]

  Flags:

-a
    Align grids with raster cells

-f
    Get text color from cell color value

--help
    Print usage summary

--verbose
    Verbose module output

--quiet
    Quiet module output

--ui
    Force launching GUI dialog

  Parameters:

map=name [required]
    Name of raster map

text_color=name
    Text color
    Either a standard color name or R:G:B triplet
    Default: black

grid_color=name
    Grid color
    Either a standard color name, R:G:B triplet, or "none"
    Default: gray

precision=integer
    Number of significant digits (floating point only)
    Options: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
    Default: 1

font=string
    Font name

path=name
    Path to font file

charset=string
    Text encoding (only applicable to TrueType fonts)

DESCRIPTION
d.rast.num overlays cell category values onto a raster map layer displayed on the user’s graphics monitor. Category values will be displayed in the text color given and scaled to fit within a single cell. A grid outlining each map cell will also be overlain in a user-specified color, unless it has been set to "none".

If no grid color is given the default will be used. If no map layer is specified, the program will use whatever raster map layer is currently displayed in the active frame on the graphics monitor.

If the -f flag is given the displayed number will take on the color of the base map in that cell.

NOTES
The user is advised to set the current region to a relatively small area (i.e., less than 100 rows by 100 columns); otherwise, the individual cells being displayed will be small and the category value associated with each will be difficult to see. No data cells are indicated with "Null".

EXAMPLE
Distance from the streams network (North Carolina sample dataset):

g.region raster=streams_derived -p
r.grow.distance input=streams_derived distance=dist_from_streams
d.rast.num dist_from_streams -a

Euclidean distance from the streams network in meters (detail, numbers shown with d.rast.num)

SEE ALSO
d.frame, d.grid, d.rast, d.rast.arrow, d.rast.edit, g.region, r.slope.aspect

AUTHORS
Raghavan Srinivasan, and Chris Rewerts,
Agricultural Engineering, Purdue University

SOURCE CODE

Available at: d.rast.num source code (history)

Accessed: Thursday Oct 30 22:16:26 2025

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