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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 modifiy 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

AUTHOR

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

       Last changed: $Date: 2018-12-15 12:16:30 +0100 (Sat, 15 Dec 2018) $

SOURCE CODE

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

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