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.

USAGE

       Note:  this help page refers to the old Tcl/Tk version of this program. Parts of it may be out of date or
       wrong.

   Overview window
       An overview window shows the entire map with a 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.  Moving the editing view can take a while.

   Mouse and menus
       Cell  editing  is done using a mouse cursor to choose menu selections and indicate areas on the displayed
       raster map that are to be edited.

       Selections available at the top of the edit window are Save and Exit.

       As the mouse travels over the cells in the edit window you are shown the current coordinates and  current
       cell values under the cursor.

       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 under the coordinate information bar. A value of "*" indicates a NULL value should be used.

   Arrows
       This function is available for users editing aspect maps.  The  d.rast.arrow  program  is  called,  which
       draws  arrows  over the displayed cells to indicate the downslope direction of the cell.  You can set the
       aspect map to use on the command line.  Aspect maps are expected to be  in  regular  "GRASS"  format,  as
       produced by r.slope.aspect; i.e. degrees counter-clockwise from east.

NOTES

       There is no "undo" command or way to exit edit mode without saving changes.

       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).

TODO

       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 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

AUTHOR

       Tcl/Tk and wxPython versions: Glynn Clements
       Replaces Xdriver version in C by Chris Rewerts, Agricultural Engineering, Purdue University

       Last changed: $Date: 2012-08-13 17:31:56 +0200 (Mon, 13 Aug 2012) $

SOURCE CODE

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

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       © 2003-2018 GRASS Development Team, GRASS GIS 7.4.0 Reference Manual

GRASS 7.4.0                                                                                  d.rast.edit(1grass)