rmapshaper (version 0.5.0)

ms_explode: Convert multipart lines or polygons to singlepart

Description

For objects of class Spatial (e.g., SpatialPolygonsDataFrame), you may find it faster to use sp::disaggregate.

Usage

ms_explode(input, ...)

Value

same class as input

Arguments

input

One of:

• geo_json or character multipart lines, or polygons;

• multipart SpatialPolygons, SpatialLines;

• sf or sfc multipart lines, or polygons object

...

Arguments passed on to apply_mapshaper_commands

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"

Details

There is currently no method for SpatialMultiPoints

Examples

library(geojsonsf)
library(sf)

poly <- "{\"type\":\"FeatureCollection\",\"features\":
          [\n{\"type\":\"Feature\",\"geometry\":{\"type\":
          \"MultiPolygon\",\"coordinates\":[[[[102,2],[102,3],
          [103,3],[103,2],[102,2]]],[[[100,0],[100,1],[101,1],
          [101,0],[100,0]]]]},\"properties\":{\"a\":0}}\n]}"

poly <- geojson_sf(poly)
plot(poly)
length(poly)
poly

# Explode the polygon
out <- ms_explode(poly)
plot(out)
length(out)
out