NAME

       r.object.geometry  - Calculates geometry parameters for raster objects.

KEYWORDS

       raster, statistics, reclass, clumps

SYNOPSIS

       r.object.geometry
       r.object.geometry --help
       r.object.geometry  [-m]  input=name  [output=name]   [separator=character]   [--overwrite]
       [--help]  [--verbose]  [--quiet]  [--ui]

   Flags:
       -m
           Use meters as units instead of cells

       --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
           Name for output file

       separator=character
           Field separator
           Special characters: pipe, comma, space, tab, newline
           Default: pipe

DESCRIPTION

       r.object.geometry calculates form statistics of raster objects in the input map and writes
       it  to  the  output  text file (or standard output if no output filename or ’-’ is given),
       with fields separated by the chosen separator.  Objects are defined as clumps of  adjacent
       cells with the same category value (e.g. output of r.clump or i.segment).

       By  default, values are in pixels. If values in meters is desired, the user can set the -m
       flag. If the current working region is in lat-long or has non-square pixels, using  meters
       is recommended.

       Statistics   currently  calculated  are  exactly  the  same  as  in  v.to.db  (except  for
       compact_square and mean coordinates):

           •   area

           •   perimeter

           •   compact_square (compactness compared to a square: compact_square = 4 *  sqrt(area)
               / perimeter)

           •   compact_circle (compactness compared to a circle: compact_circle = perimeter / ( 2
               * sqrt(PI * area) ))

           •   fractal dimension ( fd = 2 * ( log(perimeter) / log(area + 0.001) ) )

           •   mean x coordinate of object (in map units)

           •   mean y coordinate of object (in map units)

EXAMPLE

       g.region raster=soilsID
       r.object.geometry input=soilsID output=soils_geom.txt

SEE ALSO

        i.segment, r.clump, v.to.db

AUTHORS

       Moritz Lennert
       Markus Metz (diagonal clump tracing)

SOURCE CODE

       Available at: r.object.geometry source code (history)

       Accessed: Mon Jun 13 15:09:26 2022

       Main index | Raster index | Topics index | Keywords index | Graphical index | Full index

       © 2003-2022 GRASS Development Team, GRASS GIS 8.2.0 Reference Manual