g.gui.rdigit - GRASS manual
Author: GRASS Development Team
Description: g.gui.rdigit: Interactive editing and digitizing of raster maps.
Keywords: general, GUI, raster, editing, digitizer

## NAME

g.gui.rdigit - Interactive editing and digitizing of raster maps.

## KEYWORDS

general, GUI, raster, editing, digitizer

## SYNOPSIS

g.gui.rdigit
g.gui.rdigit --help
g.gui.rdigit [create=name] [base=name] [type=string] [edit=name] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

### Flags:

--overwrite
  Allow output files to overwrite existing files
--help
  Print usage summary
--verbose
  Verbose module output
--quiet
  Quiet module output
--ui
  Force launching GUI dialog

### Parameters:

create=name
  Name of new raster map to create
  Name for output raster map
base=name
  Name of base raster map
type=string
  Type of raster map to be created
  Storage type for resultant raster map
  Options: CELL, FCELL, DCELL
  Default: CELL
  CELL: Integer
  FCELL: Single precision floating point
  DCELL: Double precision floating point
edit=name
  Name of existing raster map to edit
  Name of input raster map

## KEYWORDS

display, GUI, raster, editing, digitizer

## DESCRIPTION

Raster Digitizer is a simple tool to quickly draw lines, areas, and circles and save these features in a raster map. It is accessible from the Map Display toolbar (from the combo box on the right).

Raster Digitizer currently allows you to:

- draw polygons, lines and points
- set category value of the feature you are drawing
- set feature width (width of currently digitized line or diameter of a digitized point in map units)
- create a new raster from scratch or from an already existing raster
- undo edits and save edits before leaving the digitizer

The typical workflow includes these steps:

1. Set computational region as needed.
2. Switch to Raster Digitizer and select a map to create. Select either a new raster or create a new raster from existing raster, also select raster type (CELL, FCELL, DCELL)
3. Specify category value and width before drawing a feature
4. Specify digitizing tool (area, line, point)
5. Start digitizing and when you want to finish area or line, use right click
6. Change color of temporary overlay depending on your needs
7. Set different category and repeat
8. At any point you can use Undo or Save
9. If existing raster is used for the new raster, digitized areas will respect the color table, but you can always set different color table.

## NOTES

Raster Digitizer respects computational region including the currently set resolution.

## EXAMPLES

In the following figures we start with elev_lid792_1m raster map in North carolina sample dataset and digitize two buildings, one rectangular and one with circular footprint. Both buildings have the roof level at 130 m. We set the width when digitizing the point to 50 meters which results in the building having 50 m in diameter. When we are done with digitizing, we save the result and explore cast shadows of the buildings with r.sun module:

    g.region raster=elev_lid792_1m
    # now create elev_edited raster by digitizing and save
    r.slope.aspect elevation=elev_edited slope=elev_slope aspect=elev_aspect
    r.sun elevation=elev_edited aspect=elev_aspect slope=elev_slope beam_rad=beam day=172 time=6

Figure: Steps to digitize new buildings on elev_lid792_1m raster map.

## SEE ALSO

wxGUI, wxGUI components, r.in.poly (backend of digitizer), g.gui.vdigit

## AUTHORS

Anna Petrasova, NCSU GeoForALL Laboratory
Tomas Zigo (standalone module)

## SOURCE CODE

Available at: wxGUI Raster Digitizer source code (history)

Accessed: Monday May 11 23:19:54 2026

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