@turf/polygon-smooth
polygonSmooth
Smooths a Polygon or MultiPolygon. Based on Chaikin's algorithm.
Warning: may create degenerate polygons.
Parameters
inputPolys
(FeatureCollection | Feature<(Polygon | MultiPolygon)>) (Multi)Polygon(s) to smoothoptions
Object Optional parameters (optional, default {}
)
options.iterations
string THe number of times to smooth the polygon. A higher value means a smoother polygon. (optional, default 1
)
Examples
var polygon = turf.polygon([[[11, 0], [22, 4], [31, 0], [31, 11], [21, 15], [11, 11], [11, 0]]]);
var smoothed = turf.polygonSmooth(polygon, {iterations: 3})
var addToMap = [smoothed, polygon];
Returns FeatureCollection<Polygon> FeatureCollection containing the smoothed polygon/poylgons
This module is part of the Turfjs project, an open source
module collection dedicated to geographic algorithms. It is maintained in the
Turfjs/turf repository, where you can create
PRs and issues.
Installation
Install this module individually:
$ npm install @turf/polygon-smooth
Or install the Turf module that includes it as a function:
$ npm install @turf/turf
6.2.0
After a bit of hiatus, TurfJS is resuming releases.
⭐️ Major Updates
- ES Modules available for all packages
- Tree shaking should significantly reduce import size of @turf/turf
- Better support for ESM modules (PR https://github.com/Turfjs/turf/pull/1942 - Author @diachedelic)
- Clean-up of test and benchmark running to make publishing easier
- Enforce styling using Prettier
- Enable ESLint and get rid of unused variables
- Upgrade rollup for more correct javascript module builds
- Only include ES5 code
🚀 New Modules
[@turf/boolean-touches
][boolean-touches]
Determines if two features touch but do not intersect
[@turf/boolean-valid
][boolean-valid]
Checks if the geometry is a valid according to the OGC Simple Feature Specification
[@turf/quadrat-analysis
][quadrat-analysis]
Performs a quadrat analysis on a set of points
[@turf/rectangle-grid
][rectangle-grid]
Creates a grid of rectangles from a bounding box
[@turf/voroni
][voronoi]
Typescript types for the options parameter have been fixed
(PR https://github.com/Turfjs/turf/pull/1424 - Author @stevage)
[@turf/points-within-polygon
][points-within-polygon]
Typescript types around the Feature's Properties will now be preserved.
(PR https://github.com/Turfjs/turf/pull/1761 - Author @rugheid)
[@turf/rewind
][rewind]
Typescript types for the 'reverse' option are now correct. Previously it was misnamed as 'reversed'.
(PR https://github.com/Turfjs/turf/pull/1786 - Author @jonnycornwell)
[@turf/difference
][difference]
No longer publishes an .mjs file.
[@turf/meta
][meta]
No longer publishes an .mjs file.
[@turf/tag
][tag]
Add MultiPolygon support.
(PR https://github.com/Turfjs/turf/pull/1996 - Author bryceroney)
🐛 Bug Fixes
-
@turf/centroid
Don't visit first point twice when calculating centroid
(PR https://github.com/Turfjs/turf/pull/1894 - Author @rowanwins)
-
@turf/transform-translate
Better handling of negative distances
(PR https://github.com/Turfjs/turf/pull/1895 - Author @rowanwins)
-
@turf/union
, @turf/difference
, @turf/intersect
Use polygon-clipping library to fix correctness issues
(PR https://github.com/Turfjs/turf/pull/1916 - Authors @mbullington, @ngottlieb)
-
@turf/buffer
Change default number of steps to 8, and actually support the steps option
(PR https://github.com/Turfjs/turf/pull/1931 - Author stevenchanin)
-
@turf/buffer
Fix projection issues that produce undersized buffers at non-equatorial latitudes
(PR https://github.com/Turfjs/turf/pull/1956 - Author dyakovlev)
-
@turf/helpers
Add runtime checks to point() method, fixing an API break
(PR https://github.com/Turfjs/turf/pull/1964)
🏅 New Features/Enhancements
-
@turf/boolean-overlap
Better performance for MultiPoint geometries
(PR https://github.com/Turfjs/turf/pull/1910 - Author @mfedderly)
-
@turf/helpers
Add hectares to convertArea
(PR https://github.com/Turfjs/turf/pull/1943 - Author @DanielJDufour)
-
@turf/great-circle
Update Typescript types to support MultiLineString input
(PR https://github.com/Turfjs/turf/pull/1928 - Author kronick)
📖 Documentation
-
@turf/square-grid
Clarify inputs
(PR https://github.com/Turfjs/turf/pull/1885 - Author @raphael-leger)
-
@turf/greater-circle
Clarify properties option example
(PR https://github.com/Turfjs/turf/pull/1888 - Author @chris-catignani)
⚠️ Breaking Change
-
@turf/line-to-polygon
no longer modifies its input unless the mutate option is true
(PR https://github.com/Turfjs/turf/pull/1879 - Author @MortenBirk)
-
@turf/unkink-polygon
remove Number.prototype.modulo override
(PR https://github.com/Turfjs/turf/pull/1978)