lawn_difference: Difference

In lawn: Client for 'Turfjs' for 'Geospatial' Analysis

Description

Finds the difference between two data-Polygon's by clipping the second polygon from the first.

Usage

lawn_difference(poly1, poly2, lint = FALSE)

Arguments

poly1	A data-Feature<(data-Polygon)> feature
poly2	data-Feature<(data-Polygon)> to erase from poly1
lint	(logical) Lint or not. Uses geojsonhint. Takes up increasing time as the object to get linted increases in size, so probably use by default for small objects, but not for large if you know they are good geojson objects. Default: FALSE

Value

a data-Feature<(data-Polygon)> feature showing the area of poly1 excluding the area of poly2

See Also

Other transformations: lawn_bezier(), lawn_buffer(), lawn_concave(), lawn_convex(), lawn_intersect(), lawn_merge(), lawn_simplify(), lawn_union()

Examples

## Not run: 
# skipping on cran
poly1 <- '{
 "type": "Feature",
  "properties": {
    "fill": "#0f0"
  },
  "geometry": {
    "type": "Polygon",
    "coordinates": [[
      [-46.738586, -23.596711],
      [-46.738586, -23.458207],
      [-46.560058, -23.458207],
      [-46.560058, -23.596711],
      [-46.738586, -23.596711]
    ]]
  }
}'

poly2 <- '{
  "type": "Feature",
  "properties": {
    "fill": "#00f"
  },
  "geometry": {
    "type": "Polygon",
    "coordinates": [[
      [-46.650009, -23.631314],
      [-46.650009, -23.5237],
      [-46.509246, -23.5237],
      [-46.509246, -23.631314],
      [-46.650009, -23.631314]
    ]]
  }
}'
lawn_difference(poly1, poly2)

## End(Not run)
## Not run: 
lawn_featurecollection(list(poly1, poly2)) %>% view
lawn_difference(poly1, poly2) %>% view
fc <- lawn_featurecollection(list(
   lawn_polygon(jsonlite::fromJSON(poly1)$geometry$coordinates),
   lawn_polygon(jsonlite::fromJSON(poly2)$geometry$coordinates)
))
view(fc)

## End(Not run)

lawn documentation built on Jan. 6, 2021, 5:07 p.m.