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

In rmapshaper: Edit 'GeoJSON' and Spatial Objects

Description

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

Usage

ms_innerlines(input, force_FC = TRUE)

Arguments

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

Value

lines in the same class as the input layer

Examples

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)

rmapshaper documentation built on May 30, 2017, 6:28 a.m.

Remove small detached polygons (islands)

rmapshaper index

Convert polygons to topological boundaries (lines)