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StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics https://doi.org/10.1109/TVCG.2020.3030352
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StackGenVis/frontend/node_modules/@turf/helpers/README.md

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# @turf/helpers
<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
## earthRadius
Earth Radius used with the Harvesine formula and approximates using a spherical (non-ellipsoid) Earth.
## factors
Unit of measurement factors using a spherical (non-ellipsoid) earth radius.
## unitsFactors
Units of measurement factors based on 1 meter.
## areaFactors
Area of measurement factors based on 1 square meter.
## feature
Wraps a GeoJSON [Geometry][1] in a GeoJSON [Feature][2].
**Parameters**
- `geometry` **[Geometry][3]** input geometry
- `properties` **[Object][4]** an Object of key-value pairs to add as properties (optional, default `{}`)
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the Feature
- `options.id` **([string][7] \| [number][6])?** Identifier associated with the Feature
**Examples**
```javascript
var geometry = {
"type": "Point",
"coordinates": [110, 50]
};
var feature = turf.feature(geometry);
//=feature
```
Returns **[Feature][8]** a GeoJSON Feature
## geometry
Creates a GeoJSON [Geometry][1] from a Geometry string type & coordinates.
For GeometryCollection type use `helpers.geometryCollection`
**Parameters**
- `type` **[string][7]** Geometry Type
- `coordinates` **[Array][5]&lt;[number][6]>** Coordinates
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the Geometry
**Examples**
```javascript
var type = 'Point';
var coordinates = [110, 50];
var geometry = turf.geometry(type, coordinates);
//=geometry
```
Returns **[Geometry][3]** a GeoJSON Geometry
## point
Creates a [Point][9] [Feature][2] from a Position.
**Parameters**
- `coordinates` **[Array][5]&lt;[number][6]>** longitude, latitude position (each in decimal degrees)
- `properties` **[Object][4]** an Object of key-value pairs to add as properties (optional, default `{}`)
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the Feature
- `options.id` **([string][7] \| [number][6])?** Identifier associated with the Feature
**Examples**
```javascript
var point = turf.point([-75.343, 39.984]);
//=point
```
Returns **[Feature][8]&lt;[Point][10]>** a Point feature
## points
Creates a [Point][9] [FeatureCollection][11] from an Array of Point coordinates.
**Parameters**
- `coordinates` **[Array][5]&lt;[Array][5]&lt;[number][6]>>** an array of Points
- `properties` **[Object][4]** Translate these properties to each Feature (optional, default `{}`)
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the FeatureCollection
- `options.id` **([string][7] \| [number][6])?** Identifier associated with the FeatureCollection
**Examples**
```javascript
var points = turf.points([
[-75, 39],
[-80, 45],
[-78, 50]
]);
//=points
```
Returns **[FeatureCollection][12]&lt;[Point][10]>** Point Feature
## polygon
Creates a [Polygon][13] [Feature][2] from an Array of LinearRings.
**Parameters**
- `coordinates` **[Array][5]&lt;[Array][5]&lt;[Array][5]&lt;[number][6]>>>** an array of LinearRings
- `properties` **[Object][4]** an Object of key-value pairs to add as properties (optional, default `{}`)
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the Feature
- `options.id` **([string][7] \| [number][6])?** Identifier associated with the Feature
**Examples**
```javascript
var polygon = turf.polygon([[[-5, 52], [-4, 56], [-2, 51], [-7, 54], [-5, 52]]], { name: 'poly1' });
//=polygon
```
Returns **[Feature][8]&lt;[Polygon][14]>** Polygon Feature
## polygons
Creates a [Polygon][13] [FeatureCollection][11] from an Array of Polygon coordinates.
**Parameters**
- `coordinates` **[Array][5]&lt;[Array][5]&lt;[Array][5]&lt;[Array][5]&lt;[number][6]>>>>** an array of Polygon coordinates
- `properties` **[Object][4]** an Object of key-value pairs to add as properties (optional, default `{}`)
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the Feature
- `options.id` **([string][7] \| [number][6])?** Identifier associated with the FeatureCollection
**Examples**
```javascript
var polygons = turf.polygons([
[[[-5, 52], [-4, 56], [-2, 51], [-7, 54], [-5, 52]]],
[[[-15, 42], [-14, 46], [-12, 41], [-17, 44], [-15, 42]]],
]);
//=polygons
```
Returns **[FeatureCollection][12]&lt;[Polygon][14]>** Polygon FeatureCollection
## lineString
Creates a [LineString][15] [Feature][2] from an Array of Positions.
**Parameters**
- `coordinates` **[Array][5]&lt;[Array][5]&lt;[number][6]>>** an array of Positions
- `properties` **[Object][4]** an Object of key-value pairs to add as properties (optional, default `{}`)
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the Feature
- `options.id` **([string][7] \| [number][6])?** Identifier associated with the Feature
**Examples**
```javascript
var linestring1 = turf.lineString([[-24, 63], [-23, 60], [-25, 65], [-20, 69]], {name: 'line 1'});
var linestring2 = turf.lineString([[-14, 43], [-13, 40], [-15, 45], [-10, 49]], {name: 'line 2'});
//=linestring1
//=linestring2
```
Returns **[Feature][8]&lt;[LineString][16]>** LineString Feature
## lineStrings
Creates a [LineString][15] [FeatureCollection][11] from an Array of LineString coordinates.
**Parameters**
- `coordinates` **[Array][5]&lt;[Array][5]&lt;[number][6]>>** an array of LinearRings
- `properties` **[Object][4]** an Object of key-value pairs to add as properties (optional, default `{}`)
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the FeatureCollection
- `options.id` **([string][7] \| [number][6])?** Identifier associated with the FeatureCollection
**Examples**
```javascript
var linestrings = turf.lineStrings([
[[-24, 63], [-23, 60], [-25, 65], [-20, 69]],
[[-14, 43], [-13, 40], [-15, 45], [-10, 49]]
]);
//=linestrings
```
Returns **[FeatureCollection][12]&lt;[LineString][16]>** LineString FeatureCollection
## featureCollection
Takes one or more [Features][2] and creates a [FeatureCollection][11].
**Parameters**
- `features` **[Array][5]&lt;[Feature][8]>** input features
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the Feature
- `options.id` **([string][7] \| [number][6])?** Identifier associated with the Feature
**Examples**
```javascript
var locationA = turf.point([-75.343, 39.984], {name: 'Location A'});
var locationB = turf.point([-75.833, 39.284], {name: 'Location B'});
var locationC = turf.point([-75.534, 39.123], {name: 'Location C'});
var collection = turf.featureCollection([
locationA,
locationB,
locationC
]);
//=collection
```
Returns **[FeatureCollection][12]** FeatureCollection of Features
## multiLineString
Creates a [Feature&lt;MultiLineString>][17] based on a
coordinate array. Properties can be added optionally.
**Parameters**
- `coordinates` **[Array][5]&lt;[Array][5]&lt;[Array][5]&lt;[number][6]>>>** an array of LineStrings
- `properties` **[Object][4]** an Object of key-value pairs to add as properties (optional, default `{}`)
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the Feature
- `options.id` **([string][7] \| [number][6])?** Identifier associated with the Feature
**Examples**
```javascript
var multiLine = turf.multiLineString([[[0,0],[10,10]]]);
//=multiLine
```
- Throws **[Error][18]** if no coordinates are passed
Returns **[Feature][8]&lt;[MultiLineString][19]>** a MultiLineString feature
## multiPoint
Creates a [Feature&lt;MultiPoint>][20] based on a
coordinate array. Properties can be added optionally.
**Parameters**
- `coordinates` **[Array][5]&lt;[Array][5]&lt;[number][6]>>** an array of Positions
- `properties` **[Object][4]** an Object of key-value pairs to add as properties (optional, default `{}`)
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the Feature
- `options.id` **([string][7] \| [number][6])?** Identifier associated with the Feature
**Examples**
```javascript
var multiPt = turf.multiPoint([[0,0],[10,10]]);
//=multiPt
```
- Throws **[Error][18]** if no coordinates are passed
Returns **[Feature][8]&lt;[MultiPoint][21]>** a MultiPoint feature
## multiPolygon
Creates a [Feature&lt;MultiPolygon>][22] based on a
coordinate array. Properties can be added optionally.
**Parameters**
- `coordinates` **[Array][5]&lt;[Array][5]&lt;[Array][5]&lt;[Array][5]&lt;[number][6]>>>>** an array of Polygons
- `properties` **[Object][4]** an Object of key-value pairs to add as properties (optional, default `{}`)
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the Feature
- `options.id` **([string][7] \| [number][6])?** Identifier associated with the Feature
**Examples**
```javascript
var multiPoly = turf.multiPolygon([[[[0,0],[0,10],[10,10],[10,0],[0,0]]]]);
//=multiPoly
```
- Throws **[Error][18]** if no coordinates are passed
Returns **[Feature][8]&lt;[MultiPolygon][23]>** a multipolygon feature
## geometryCollection
Creates a [Feature&lt;GeometryCollection>][24] based on a
coordinate array. Properties can be added optionally.
**Parameters**
- `geometries` **[Array][5]&lt;[Geometry][3]>** an array of GeoJSON Geometries
- `properties` **[Object][4]** an Object of key-value pairs to add as properties (optional, default `{}`)
- `options` **[Object][4]** Optional Parameters (optional, default `{}`)
- `options.bbox` **[Array][5]&lt;[number][6]>?** Bounding Box Array [west, south, east, north] associated with the Feature
- `options.id` **([string][7] \| [number][6])?** Identifier associated with the Feature
**Examples**
```javascript
var pt = {
"type": "Point",
"coordinates": [100, 0]
};
var line = {
"type": "LineString",
"coordinates": [ [101, 0], [102, 1] ]
};
var collection = turf.geometryCollection([pt, line]);
//=collection
```
Returns **[Feature][8]&lt;[GeometryCollection][25]>** a GeoJSON GeometryCollection Feature
## round
Round number to precision
**Parameters**
- `num` **[number][6]** Number
- `precision` **[number][6]** Precision (optional, default `0`)
**Examples**
```javascript
turf.round(120.4321)
//=120
turf.round(120.4321, 2)
//=120.43
```
Returns **[number][6]** rounded number
## radiansToLength
Convert a distance measurement (assuming a spherical Earth) from radians to a more friendly unit.
Valid units: miles, nauticalmiles, inches, yards, meters, metres, kilometers, centimeters, feet
**Parameters**
- `radians` **[number][6]** in radians across the sphere
- `units` **[string][7]** can be degrees, radians, miles, or kilometers inches, yards, metres, meters, kilometres, kilometers. (optional, default `'kilometers'`)
Returns **[number][6]** distance
## lengthToRadians
Convert a distance measurement (assuming a spherical Earth) from a real-world unit into radians
Valid units: miles, nauticalmiles, inches, yards, meters, metres, kilometers, centimeters, feet
**Parameters**
- `distance` **[number][6]** in real units
- `units` **[string][7]** can be degrees, radians, miles, or kilometers inches, yards, metres, meters, kilometres, kilometers. (optional, default `'kilometers'`)
Returns **[number][6]** radians
## lengthToDegrees
Convert a distance measurement (assuming a spherical Earth) from a real-world unit into degrees
Valid units: miles, nauticalmiles, inches, yards, meters, metres, centimeters, kilometres, feet
**Parameters**
- `distance` **[number][6]** in real units
- `units` **[string][7]** can be degrees, radians, miles, or kilometers inches, yards, metres, meters, kilometres, kilometers. (optional, default `'kilometers'`)
Returns **[number][6]** degrees
## bearingToAzimuth
Converts any bearing angle from the north line direction (positive clockwise)
and returns an angle between 0-360 degrees (positive clockwise), 0 being the north line
**Parameters**
- `bearing` **[number][6]** angle, between -180 and +180 degrees
Returns **[number][6]** angle between 0 and 360 degrees
## radiansToDegrees
Converts an angle in radians to degrees
**Parameters**
- `radians` **[number][6]** angle in radians
Returns **[number][6]** degrees between 0 and 360 degrees
## degreesToRadians
Converts an angle in degrees to radians
**Parameters**
- `degrees` **[number][6]** angle between 0 and 360 degrees
Returns **[number][6]** angle in radians
## convertLength
Converts a length to the requested unit.
Valid units: miles, nauticalmiles, inches, yards, meters, metres, kilometers, centimeters, feet
**Parameters**
- `length` **[number][6]** to be converted
- `originalUnit` **[string][7]** of the length
- `finalUnit` **[string][7]** returned unit (optional, default `'kilometers'`)
Returns **[number][6]** the converted length
## convertArea
Converts a area to the requested unit.
Valid units: kilometers, kilometres, meters, metres, centimetres, millimeters, acres, miles, yards, feet, inches
**Parameters**
- `area` **[number][6]** to be converted
- `originalUnit` **[string][7]** of the distance (optional, default `'meters'`)
- `finalUnit` **[string][7]** returned unit (optional, default `'kilometers'`)
Returns **[number][6]** the converted distance
## isNumber
isNumber
**Parameters**
- `num` **any** Number to validate
**Examples**
```javascript
turf.isNumber(123)
//=true
turf.isNumber('foo')
//=false
```
Returns **[boolean][26]** true/false
## isObject
isObject
**Parameters**
- `input` **any** variable to validate
**Examples**
```javascript
turf.isObject({elevation: 10})
//=true
turf.isObject('foo')
//=false
```
Returns **[boolean][26]** true/false
[1]: https://tools.ietf.org/html/rfc7946#section-3.1
[2]: https://tools.ietf.org/html/rfc7946#section-3.2
[3]: https://tools.ietf.org/html/rfc7946#section-3.1
[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array
[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
[8]: https://tools.ietf.org/html/rfc7946#section-3.2
[9]: https://tools.ietf.org/html/rfc7946#section-3.1.2
[10]: https://tools.ietf.org/html/rfc7946#section-3.1.2
[11]: https://tools.ietf.org/html/rfc7946#section-3.3
[12]: https://tools.ietf.org/html/rfc7946#section-3.3
[13]: https://tools.ietf.org/html/rfc7946#section-3.1.6
[14]: https://tools.ietf.org/html/rfc7946#section-3.1.6
[15]: https://tools.ietf.org/html/rfc7946#section-3.1.4
[16]: https://tools.ietf.org/html/rfc7946#section-3.1.4
[17]: Feature<MultiLineString>
[18]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
[19]: https://tools.ietf.org/html/rfc7946#section-3.1.5
[20]: Feature<MultiPoint>
[21]: https://tools.ietf.org/html/rfc7946#section-3.1.3
[22]: Feature<MultiPolygon>
[23]: https://tools.ietf.org/html/rfc7946#section-3.1.7
[24]: Feature<GeometryCollection>
[25]: https://tools.ietf.org/html/rfc7946#section-3.1.8
[26]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
<!-- This file is automatically generated. Please don't edit it directly:
if you find an error, edit the source file (likely index.js), and re-run
./scripts/generate-readmes in the turf project. -->
---
This module is part of the [Turfjs project](http://turfjs.org/), an open source
module collection dedicated to geographic algorithms. It is maintained in the
[Turfjs/turf](https://github.com/Turfjs/turf) repository, where you can create
PRs and issues.
### Installation
Install this module individually:
```sh
$ npm install @turf/helpers
```
Or install the Turf module that includes it as a function:
```sh
$ npm install @turf/turf
```