APpolygonize: AP Polygonize

In APfun: Geo-Processing Helper Functions

Description

This function uses the gdal_polygonize.py GDAL utility. Its implementation was adapted from the solution developed by John Baumgartner and Francisco Rodriguez-Sanchez.

Usage

APpolygonize(
  inRaster,
  readToMemory = TRUE,
  outFile = NULL,
  OSGeoPath = "C:/OSGeo4W64",
  connectivity = 4
)

Arguments

inRaster	a RasterLayer or a path to a raster file
readToMemory	logical. Read output polygons into memory as a SpatialPolygonsDataFrame
outFile	character. Optional path for saving output as an Esri Shapefile.
OSGeoPath	character. Path to the OSGeo4W installation directory
connectivity	numeric. Can be either set to 4 (rook's case) or 8 (queen's case)

Details

This function needs OSGeo4W to be installed. The OSGeo4W installation path, set to 'C:/OSGeo4W64' by default, will then be used to find the gdal_polygonize.bat file.

Value

SpatialPolygonsDataFrame

See Also

• GDAL: https://gdal.org/

• OSGeo4W download page: https://trac.osgeo.org/osgeo4w/

• John Baumgartner's blog post on gdal_polygonize: https://johnbaumgartner.wordpress.com/2012/07/26/getting-rasters-into-shape-from-r/

APfun documentation built on Oct. 23, 2020, 8:10 p.m.