apply_mapshaper_commands function

Apply a mapshaper command string to a geojson object

apply_mapshaper_commands(
  data,
  command,
  force_FC = TRUE,
  sys = FALSE,
  sys_mem = getOption("mapshaper.sys_mem", default = 8),
  quiet = getOption("mapshaper.sys_quiet", default = FALSE)
)

Arguments

• data: character containing geojson or path to geojson file. If a file path, sys must be true.
• command: valid mapshaper command string
• force_FC: should the output be forced to be a FeatureCollection (or sf object or Spatial*DataFrame) even if there are no attributes? Default TRUE. If FALSE and there are no attributes associated with the geometries, a GeometryCollection (or Spatial object with no dataframe, or sfc) will be output.
• sys: Should the system mapshaper be used instead of the bundled mapshaper? Gives better performance on large files. Requires the mapshaper node package to be installed and on the PATH.
• sys_mem: How much memory (in GB) should be allocated if using the system mapshaper (sys = TRUE)? Default 8. Ignored if sys = FALSE. This can also be set globally with the option "mapshaper.sys_mem"
• quiet: If sys = TRUE, should the mapshaper messages be silenced? Default FALSE. This can also be set globally with the option "mapshaper.sys_quiet"

Returns

geojson

Examples

nc <- sf::read_sf(system.file("gpkg/nc.gpkg", package = "sf"))
rmapshaper::apply_mapshaper_commands(geojsonsf::sf_geojson(nc), "-clean")