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: Thursday Aug 01 11:32:16 2024

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       © 2003-2024 GRASS Development Team, GRASS GIS 8.4.0 Reference Manual