ms_innerlines: Create a line layer consisting of shared boundaries with no...

In rmapshaper: Client for 'mapshaper' for 'Geospatial' Operations

Create a line layer consisting of shared boundaries with no attribute data

Description

Create a line layer consisting of shared boundaries with no attribute data

Usage

ms_innerlines(input, ...)

Arguments

input

input polygons object to convert to inner lines. One of: geo_json or character polygons; SpatialPolygons*; sf or sfc 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"

Value

lines in the same class as the input layer, but without attributes

Examples

library(geojsonsf)
library(sf)

poly <- structure('{"type":"FeatureCollection",
            "features":[
              {"type":"Feature",
                "properties":{"foo": "a"},
                "geometry":{"type":"Polygon","coordinates":[[
                  [102,2],[102,3],[103,3],[103,2],[102,2]
                  ]]}}
              ,{"type":"Feature",
                "properties":{"foo": "a"},
                "geometry":{"type":"Polygon","coordinates":[[
                  [103,3],[104,3],[104,2],[103,2],[103,3]
                  ]]}},
              {"type":"Feature",
                "properties":{"foo": "b"},
                "geometry":{"type":"Polygon","coordinates":[[
                  [102,1],[102,2],[103,2],[103,1],[102,1]
                  ]]}},
              {"type":"Feature",
                "properties":{"foo": "b"},
                "geometry":{"type":"Polygon","coordinates":[[
                  [103,1],[103,2],[104,2],[104,1],[103,1]
                  ]]}}]}', class = c("geojson", "json"))

poly <- geojson_sf(poly)
plot(poly)

out <- ms_innerlines(poly)
plot(out)

rmapshaper documentation built on April 11, 2023, 5:55 p.m.