NAME

       d.rast.edit  - Edits cell values in a raster map.

KEYWORDS

       display, editing, raster

SYNOPSIS

       d.rast.edit
       d.rast.edit --help
       d.rast.edit  input=name  output=name  [aspect=name]   [width=integer]   [height=integer]   [size=integer]
       [rows=integer]   [cols=integer]   [--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:
       input=name [required]
           Name of input raster map

       output=name [required]
           Name for output raster map

       aspect=name
           Name of input aspect raster map

       width=integer
           Width of display canvas
           Default: 640

       height=integer
           Height of display canvas
           Default: 480

       size=integer
           Minimum size of each cell
           Default: 12

       rows=integer
           Maximum number of rows to load
           Default: 100

       cols=integer
           Maximum number of columns to load
           Default: 100

DESCRIPTION

       The d.rast.edit program allows users to interactively edit cell category values in  a  raster  map  layer
       displayed to the graphics monitor using a mouse cursor.

   Overview window
       An  overview  window  shows  the  entire  map with a red box showing the current editing region. The edit
       window shows the cells within the selected area.  Click on a new spot on the overview window to move  the
       editing area.

   Raster cell editing
       Cell  editing is done using the mouse cursor to indicate the cell(s) on the displayed raster map that are
       to be edited.

       To change the value of a cell put the new value to use in the "New value" box at the bottom left  of  the
       edit window. A value of "*" indicates a NULL value should be used.

       Important:  the  new  value  in the "New value" box must be confirmed with ENTER, otherwise it is not yet
       active.

   Saving the edited map
       To save the edited map, the "File" menu contains the entry Save.  To leave d.rast.edit, use Exit  in  the
       menu.

   Map pan with arrow keys
       The map can be shifted using the arrow keys on the keyboard.

NOTES

       There is no "undo" command nor way to exit edit mode without saving changes to the output map.

       Any  MASK  in  place  will be respected when writing the new raster map layer, including any edits to the
       MASKed areas.

   Geographic Region Concerns
       d.rast.edit reads the region definition for the raster map layer being  edited  from  its  internal  cell
       header file. The new, edited copy of the raster layer will be created with the same resolution and region
       dimensions.

       The  primary  bane  of  the  d.rast.edit program involves large map layers with lots of rows and columns)
       and/or slow computers, since the program must read and write raster map layers row by row  for  the  full
       size  of  the  map  layer as dictated by its region size and resolution.  (The current region settings of
       north, south, east, and west will not limit the size of the edited copy of the map layer, since by use of
       the overview selection these values may change several times during the editing session).

EXAMPLE

       Editing raster values in a LiDAR DEM, North Carolina sample data:
       g.region raster=elev_lid792_1m -p
       # pan to area of interest and edit raster cells (I used "102" as value to modify cells
       # Use:  File > Save to save
       # then: File > Exit
       d.rast.edit input=elev_lid792_1m output=elev_lid792_1m_modified
       # comparison of raster statistics
       # original stats, note the min value
       r.univar -g elev_lid792_1m
       # modified map stats, note the min value
       r.univar -g elev_lid792_1m_modified
       Figure: Editing of pixels in an elevation raster map using d.rast.edit

TODO

       d.rast.edit should not create a new raster map layer if the user makes no cell edits  while  running  the
       program and leaving it without saving.

       It  would be nice to incorporate a scrollable version of d.legend (such that one could see a label legend
       for files with many categories on a standard size sub-frame).  It would be  even  nicer  to  be  able  to
       select the category values from a graphical legend when editing cell values (thereby saving a trip to the
       text frame to type in the new value).

       Perhaps  method(s)  for  multiple   or  mass cell edits would be useful.  This could be done by providing
       modes in which the user may:

       1      edit a block of cells to a given value by drawing a box;

       2      be able to choose a given value which is automatically used as the new value on each  cell  chosen
              until a different value is desired.

       There  is  no  user-interrupt  handling.  This could leave files in .tmp or (rarely) result in half-baked
       raster maps.  The original file would survive unscathed by an interrupt at most any point  in  execution.
       Beware of exiting the program by means other than using exit on the Main Menu.

SEE ALSO

        d.rast.arrow, d.rast.num, wxGUI.rdigit

AUTHORS

       Tcl/Tk (2007) and wxPython versions (2008): Glynn Clements
       Replaces Xdriver version in C by Chris Rewerts, April 1991, Agricultural Engineering, Purdue University

SOURCE CODE

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

       Accessed: Monday Apr 01 03:09:27 2024

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       © 2003-2024 GRASS Development Team, GRASS GIS 8.3.2 Reference Manual

GRASS 8.3.2                                                                                  d.rast.edit(1grass)