turf

Takes a collection of features and returns a standard deviational ellipse.

A treeshaken subset of JSTS functions for use within

[Turf](http://turfjs.org/) feature module

turf featureCollection module

a JavaScript library for performing geospatial operations with GeoJSON

Provides tools for conversion between geographic coordinates and projected coordinates.

Provides tools for iterating over and manipulating GeoJSON objects.

Measures patterns of attribute values associated with features. Reveals whether similar values tend to occur near each other, or whether high or low values are interspersed

Takes a grid of values (GeoJSON format) and a set of threshold ranges. It outputs polygons that group areas within those ranges, effectively creating filled contour isobands.

Lightweight utility for input validation and data extraction in Turf.js. Ensures GeoJSON inputs are in the correct format and extracts specific components like coordinates or geometries.

Calculate the influence or weight of points over an area based on their distances.

Generate contour lines from a grid of data.

Calculates an index based the average distances between points in the dataset, thereby providing inference as to whether the data is clustered, dispersed, or randomly distributed within the study area.

Takes a Feature or FeatureCollection and returns a Point guaranteed to be on the surface of the feature.

Takes a Feature and a bbox and clips the feature to the bbox using lineclip.

Calculate great circles routes as LineString or MultiLineString.

Split a LineString by another GeoJSON Feature.

Determine whether each segment of a line is parallel to the correspondent segment of another line.

Checks if the geometry is a valid according to the OGC Simple Feature Specification.

Calculates the distance between a given point and the nearest point on a line.

Converts a polygon to a line string.

Determines whether the second geometry is completely within the first geometry.

Checks if two geometries have no overlapping areas.

Determines whether the first geometry is completely within the second geometry.

Determine whether none of the points common to both geometries intersect the interiors of both geometries.

Checks if two geometries cross each other.

Checks if two geometries overlap in any way.

Quadrat analysis lays a set of equal-size areas(quadrat) over the study area and counts the number of features in each quadrat and creates a frequency table.

GeoJSON implementation of RBush

Finds the central point of a GeoJSON feature, like a city or a park. Ideal for placing labels or markers.

Creates a convex hull around points

Converts line(s) to polygon(s).

Finds the “balance point” of irregular shapes, like a country outline.

Calculates the distance from a point to the edges of a polygon or multi-polygon.

Finds the nearest point on a line to a given point

Combines two or more polygons into a single polygon.

Takes a point and calculates the circle polygon given a radius.

Truncates precision of GeoJSON coordinates.

Determine whether two geometries of the same type have identical X,Y coordinate values

Takes a GeoJSON feature and returns points at all self-intersections.

Takes a line and returns a line at offset by the specified distance.

Returns the closest point, of a collection of points, to a line.

Takes any LineString or Polygon and returns the overlapping lines between both features.

Finds points that fall within polygon(s).

Determines the geometric center of a polygon or shape.

Creates a circular sector of a circle.

Takes a kinked polygon and returns a feature collection of polygons that have no kinks.

Calculates a point along a line at a specific distance

Returns the shortest path from start to end without colliding with any Feature in obstacles.

Creates a buffer around a GeoJSON feature.

Takes polygons or multipolygons and an optional mask, and returns an exterior ring polygon with holes.

Removes redundant coordinates from a GeoJSON Geometry.

Finds the tangents of a polygon from a point.

Checks if two geometries have an area of overlap without one being completely contained inside the other.

Takes a triangular plane as a polygon and a point within that triangle, and returns the z-value at that point.

Calculates the average angle of a set of lines, measuring the trend of it.

Takes a FeatureCollection of points and calculates the median center.