NAME

       pksieve - program to sieve filter raster image

SYNOPSIS

       pksieve -i input [-s size] -o output [options]

DESCRIPTION

       pksieve  filters  small  objects  (maximum size defined with the option -s) in a raster by
       replacing them to the largest neighbor object.  In this context, objects  are  defined  as
       pixels  of  the same value that are also connected.  The connection can be defined in four
       directions (N-S and W-E: set option -c 4) or eight directions (N-S, W-E and diagonals  NW-
       SE, NE-SW: set option -c 8).

OPTIONS

       -i filename, --input filename
              Input image file

       -s size, --size size
              raster  polygons  with  sizes  smaller  than this will be merged into their largest
              neighbour.  No sieve is performed if size = 0

       -o filename, --output filename
              Output image file Output image file

       -c 4|8, --connect 4|8
              the connectedness: 4 directions or 8 directions

       -b band, --band band
              the band to be used from input file

       -m filename, --mask filename
              Use the first band of the specified file as a validity mask (zero is invalid,  non-
              zero is valid).

       -ot type, --otype type
              Data  type  for  output  image ({Byte / Int16 / UInt16 / UInt32 / Int32 / Float32 /
              Float64 / CInt16 / CInt32 / CFloat32 / CFloat64}).  Empty string: inherit type from
              input image

       -of format, --oformat format
              Output image format (see also gdal_translate(1)).  Empty string: inherit from input
              image

       -co option, --co option
              Creation option for output file.  Multiple options can be specified.

       -ct filename, --ct filename
              colour table in ASCII format having 5 columns: id R G B ALFA (0: transparent,  255:
              solid)

       -v level, --verbose level
              verbose mode if > 0

EXAMPLE

       merge  all  patches  smaller  than  5  pixels  into  bigger  classes, using 8 connectivity
       (horizontal, vertical and diagonal)

       pksieve -i input.tif -c 8 -c 5 -o output.shp

                                         24 January 2016                               pksieve(1)