filter_islands.md
In rmapshaper: Client for 'mapshaper' for 'Geospatial' Operations

ms_filter_islands works with min_area

{
  "type": "character",
  "attributes": {
    "class": {
      "type": "character",
      "attributes": {},
      "value": ["geojson", "json"]
    }
  },
  "value": ["{\"type\":\"FeatureCollection\", \"features\": [\n{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[102,2],[104,2],[104,4],[102,4],[102,2]]]},\"properties\":{\"rmapshaperid\":0}},\n{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[100,2],[101.5,4],[98,4],[100,2]]]},\"properties\":{\"rmapshaperid\":1}}\n]}"]
}

ms_filter_islands works with min_vertoces

{
  "type": "character",
  "attributes": {
    "class": {
      "type": "character",
      "attributes": {},
      "value": ["geojson", "json"]
    }
  },
  "value": ["{\"type\":\"FeatureCollection\", \"features\": [\n{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[102,2],[104,2],[104,4],[102,4],[102,2]]]},\"properties\":{\"rmapshaperid\":0}},\n{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[100,0],[101,0],[101,1],[100,1],[100,0]]]},\"properties\":{\"rmapshaperid\":1}}\n]}"]
}

ms_filter_islands works drop_null_geometries = FALSE

{
  "type": "character",
  "attributes": {
    "class": {
      "type": "character",
      "attributes": {},
      "value": ["geojson", "json"]
    }
  },
  "value": ["{\"type\":\"FeatureCollection\", \"features\": [\n{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[102,2],[104,2],[104,4],[102,4],[102,2]]]},\"properties\":{\"rmapshaperid\":0}},\n{\"type\":\"Feature\",\"geometry\":null,\"properties\":{\"rmapshaperid\":1}},\n{\"type\":\"Feature\",\"geometry\":null,\"properties\":{\"rmapshaperid\":2}}\n]}"]
}

ms_filter_islands works with sys = TRUE

{
  "type": "character",
  "attributes": {
    "class": {
      "type": "character",
      "attributes": {},
      "value": ["geojson", "json"]
    }
  },
  "value": ["{\"type\":\"FeatureCollection\", \"features\": [\n{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[102,2],[104,2],[104,4],[102,4],[102,2]]]},\"properties\":{\"rmapshaperid\":0}},\n{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[100,2],[101.5,4],[98,4],[100,2]]]},\"properties\":{\"rmapshaperid\":1}},\n{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[100,0],[101,0],[101,1],[100,1],[100,0]]]},\"properties\":{\"rmapshaperid\":2}}\n]}"]
}