ms_innerlines: Create a line layer consisting of shared boundaries with no...
In rmapshaper: Client for 'mapshaper' for 'Geospatial' Operations

Description Usage Arguments Value Examples

View source: R/inner_lines.R

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

1	ms_innerlines(input, force_FC = TRUE)

input

input polygons object to convert to inner lines. One of:

geo_json or character polygons;
geo_list polygons;
SpatialPolygons*;
sf or sfc polygons object

force_FC

should the output be forced to be a FeatureCollection even if there are no attributes? Default TRUE. FeatureCollections are more compatible with rgdal::readOGR and geojsonio::geojson_sp. If FALSE and there are no attributes associated with the geometries, a GeometryCollection will be output. Ignored for Spatial objects.

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

library(geojsonio)
library(sp)

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("json", "geo_json"))

poly <- geojson_sp(poly)
plot(poly)

out <- ms_innerlines(poly)
plot(out)