pksieve - program to sieve filter raster image
pksieve
-i input [-s size] -o output
[options]
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).
- -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
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