d.rast.num - GRASS manual
Author: GRASS Development Team
Description: d.rast.num: Overlays cell category values on a raster map displayed in the active graphics frame.
Keywords: display, map annotations, raster

## 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: Saturday May 09 12:56:20 2026

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