geometryEngine | API Reference | ArcGIS Maps SDK for JavaScript 4.30

See also

Method Overview

Return Type	Summary	Object
Polygon\|Polygon []	Creates planar (or Euclidean) buffer polygons at a specified distance around the input geometries.	geometryEngine
Geometry	Calculates the clipped geometry from a target geometry by an envelope.	geometryEngine
Boolean	Indicates if one geometry contains another geometry.	geometryEngine
Geometry\|Geometry []	Calculates the convex hull of one or more geometries.	geometryEngine
Boolean	Indicates if one geometry crosses another geometry.	geometryEngine
Geometry []	Splits the input Polyline or Polygon where it crosses a cutting Polyline.	geometryEngine
Geometry	Densify geometries by plotting points between existing vertices.	geometryEngine
Geometry\|Geometry []	Creates the difference of two geometries.	geometryEngine
Boolean	Indicates if one geometry is disjoint (doesn't intersect in any way) with another geometry.	geometryEngine
Number	Calculates the shortest planar distance between two geometries.	geometryEngine
Boolean	Indicates if two geometries are equal.	geometryEngine
SpatialReferenceInfo	Returns an object containing additional information about the input spatial reference.	geometryEngine
Geometry	Flips a geometry on the horizontal axis.	geometryEngine
Geometry	Flips a geometry on the vertical axis.	geometryEngine
Geometry	Performs the generalize operation on the geometries in the cursor.	geometryEngine
Number	Calculates the area of the input geometry.	geometryEngine
Polygon\|Polygon []	Creates geodesic buffer polygons at a specified distance around the input geometries.	geometryEngine
Geometry	Returns a geodetically densified version of the input geometry.	geometryEngine
Number	Calculates the length of the input geometry.	geometryEngine
Geometry\|Geometry []	Creates new geometries from the intersections between two geometries.	geometryEngine
Point []	Returns an array of points at the intersecting locations of two input polylines.	geometryEngine
Boolean	Indicates if one geometry intersects another geometry.	geometryEngine
Boolean	Indicates if the given geometry is topologically simple.	geometryEngine
NearestPointResult	Finds the coordinate of the geometry that is closest to the specified point.	geometryEngine
NearestPointResult	Finds the vertex on the geometry nearest to the specified point.	geometryEngine
NearestPointResult []	Finds all vertices in the given distance from the specified point, sorted from the closest to the furthest and returns them as an array of Objects.	geometryEngine
Geometry\|Geometry []	The offset operation creates a geometry that is a constant planar distance from an input polyline or polygon.	geometryEngine
Boolean	Indicates if one geometry overlaps another geometry.	geometryEngine
Number	Calculates the area of the input geometry.	geometryEngine
Number	Calculates the length of the input geometry.	geometryEngine
Boolean	Indicates if the given DE-9IM relation is true for the two geometries.	geometryEngine
Geometry	Rotates a geometry counterclockwise by the specified number of degrees.	geometryEngine
Geometry	Performs the simplify operation on the geometry, which alters the given geometries to make their definitions topologically legal with respect to their geometry type.	geometryEngine
Geometry\|Geometry []	Creates the symmetric difference of two geometries.	geometryEngine
Boolean	Indicates if one geometry touches another geometry.	geometryEngine
Geometry	All inputs must be of the same type of geometries and share one spatial reference.	geometryEngine
Boolean	Indicates if one geometry is within another geometry.	geometryEngine

Method Details

buffer Method buffer(geometry, distance, unit, unionResults){Polygon |Polygon[]}

Creates planar (or Euclidean) buffer polygons at a specified distance around the input geometries.

The GeometryEngine has two methods for buffering geometries client-side: buffer and geodesicBuffer. Use caution when deciding which method to use. As a general rule, use geodesicBuffer if the input geometries have a spatial reference of either WGS84 (wkid: 4326) or Web Mercator. Only use buffer (this method) when attempting to buffer geometries with a projected coordinate system other than Web Mercator. If you need to buffer geometries with a geographic coordinate system other than WGS84 (wkid: 4326), use geometryService.buffer().

Parameters

geometry Geometry|Geometry []

The buffer input geometry. The geometry and distance parameters must be specified as either both arrays or both non-arrays. Never specify one as an array and the other a non-array.

distance Number|Number []

The specified distance(s) for buffering. The geometry and distance parameters must be specified as either both arrays or both non-arrays. Never specify one as an array and the other a non-array. When using an array of geometries as input, the length of the geometry array does not have to equal the length of the distance array. For example, if you pass an array of four geometries: [g1, g2, g3, g4] and an array with one distance: [d1], all four geometries will be buffered by the single distance value. If instead you use an array of three distances: [d1, d2, d3], g1 will be buffered by d1, g2 by d2, and g3 and g4 will both be buffered by d3. The value of the geometry array will be matched one to one with those in the distance array until the final value of the distance array is reached, in which case that value will be applied to the remaining geometries.

unit LinearUnits

optional

Measurement unit of the distance(s). Defaults to the units of the input geometries.

unionResults Boolean

optional

Default Value: false

Determines whether the output geometries should be unioned into a single polygon.

Returns

Type	Description
Polygon \| Polygon []	The resulting buffer(s). The result will be an array if an array of geometries is used as input. It will be a single polygon if a single geometry is input into the function.

See also

Example

// Buffer point by 1000 feet
const ptBuff = geometryEngine.buffer(point, 1000, "feet");

clip Method clip(geometry, envelope){Geometry}

Calculates the clipped geometry from a target geometry by an envelope.

Parameters

geometry Geometry

The geometry to be clipped.

envelope Extent

The envelope used to clip.

Returns

Type	Description
Geometry	Clipped geometry.

See also

geometryEngineAsync.clip()

Example

// returns a new geometry of a polygon clipped by the views extent
const clippedGeometry= geometryEngine.clip(boundaryPolygon, view.extent);

contains Method contains(containerGeometry, insideGeometry){Boolean}

Indicates if one geometry contains another geometry.

Parameters

containerGeometry Geometry

The geometry that is tested for the "contains" relationship to the other geometry. Think of this geometry as the potential "container" of the insideGeometry.

insideGeometry Geometry

The geometry that is tested for the "within" relationship to the containerGeometry.

Returns

Type	Description
Boolean	Returns `true` if the `containerGeometry` contains the `insideGeometry`.

See also

geometryEngineAsync.contains()

Examples

// returns true or false for one geometry containing another
const isContained = geometryEngine.contains(boundaryPolygon, point);

// returns true or false for one geometry containing another
const isContained = geometryEngine.contains(extent, boundaryPolygon);

convexHull Method convexHull(geometry, merge){Geometry |Geometry[]}

Calculates the convex hull of one or more geometries. A convex hull is the smallest convex polygon that encloses a group of geometries or vertices. The input can be a single geometry (such as a polyline) or an array of any geometry type. The hull is typically a polygon but can also be a polyline or a point in degenerate cases.

Parameters

geometry Geometry|Geometry []

The input geometry or geometries used to calculate the convex hull. If an array is specified, the input array can include various geometry types. When an array is provided, the output will also be an array.

merge Boolean

optional

Default Value: false

Indicates whether to merge the output into a single geometry (usually a polygon).

Returns

Type	Description
Geometry \| Geometry []	Returns the convex hull of the input geometries. This is usually a polygon, but can also be a polyline (if the input is a set of points or polylines forming a straight line), or a point (in degenerate cases).

See also

geometryEngineAsync.convexHull()

Examples

// returns the convex hull of a multipoint as a single polygon
const hull = geometryEngine.convexHull(multipoint);

// returns the convex hull of an array of points as a single polygon
const [ hull ] = geometryEngine.convexHull([ pointA, pointB, pointC ], true);

// returns the convex hull for each input line geometry as three polygons
const hulls = geometryEngine.convexHull([ lineA, lineB, lineC ]);

// returns the convex hull for all input line geometries as a single polygon
const [ hull ] = geometryEngine.convexHull([ lineA, lineB, lineC ], true);

// returns the convex hull for all input geometries as a single polygon
const [ hull ] = geometryEngine.convexHull([ point, line, polygon ], true);

crosses Method crosses(geometry1, geometry2){Boolean}

Indicates if one geometry crosses another geometry.

Parameters

geometry1 Geometry

The geometry to cross.

geometry2 Geometry

The geometry being crossed.

Returns

Type	Description
Boolean	Returns `true` if `geometry1` crosses `geometry2`.

See also

geometryEngineAsync.crosses()

Example

// returns true or false if a line crosses a polygon another
const isCrossed = geometryEngine.crosses(boundaryPolygon, polyline);

cut Method cut(geometry, cutter){Geometry[]}

Splits the input Polyline or Polygon where it crosses a cutting Polyline. For Polylines, all left cuts are grouped together in the first Geometry. Right cuts and coincident cuts are grouped in the second Geometry and each undefined cut, along with any uncut parts, are output as separate Polylines. For Polygons, all left cuts are grouped in the first Polygon, all right cuts are grouped in the second Polygon, and each undefined cut, along with any leftover parts after cutting, are output as a separate Polygon. If no cuts are returned then the array will be empty. An undefined cut will only be produced if a left cut or right cut was produced and there was a part left over after cutting, or a cut is bounded to the left and right of the cutter.

Parameters

geometry Geometry

The geometry to be cut.

cutter Polyline

The polyline to cut the geometry.

Returns

Type	Description
Geometry []	Returns an array of geometries created by cutting the input geometry with the cutter.

See also

geometryEngineAsync.cut()

Example

// returns array of cut geometries
const geometries = geometryEngine.cut(boundaryPolygon, polyline);

densify Method densify(geometry, maxSegmentLength, maxSegmentLengthUnit){Geometry}

Densify geometries by plotting points between existing vertices.

Parameters

geometry Geometry

The geometry to be densified.

maxSegmentLength Number

The maximum segment length allowed. Must be a positive value.

maxSegmentLengthUnit LinearUnits

optional

Measurement unit for maxSegmentLength. Defaults to the units of the input geometry.

Returns

Type	Description
Geometry	The densified geometry.

See also

Example

// Returns a densified geometry
const geometry = geometryEngine.densify(boundaryPolygon, 25);

difference Method difference(inputGeometry, subtractor){Geometry |Geometry[]}

Creates the difference of two geometries. The resultant geometry is the portion of inputGeometry not in the subtractor. The dimension of the subtractor has to be equal to or greater than that of the inputGeometry.

Parameters

inputGeometry Geometry|Geometry []

The input geometry to subtract from.

subtractor Geometry

The geometry being subtracted from inputGeometry.

Returns

Type	Description
Geometry \| Geometry []	Returns the geometry of inputGeometry minus the subtractor geometry.

See also

geometryEngineAsync.difference()

Example

// Creates a new geometry based on the
// difference of the two
const geometry = geometryEngine.difference(boundaryPolygon, buffers);

disjoint Method disjoint(geometry1, geometry2){Boolean}

Indicates if one geometry is disjoint (doesn't intersect in any way) with another geometry.

Parameters

geometry1 Geometry

The base geometry that is tested for the "disjoint" relationship to the other geometry.

geometry2 Geometry

The comparison geometry that is tested for the "disjoint" relationship to the other geometry.

Returns

Type	Description
Boolean	Returns `true` if `geometry1` and `geometry2` are disjoint (don't intersect in any way).

See also

geometryEngineAsync.disjoint()

Example

// returns true if a geometry is not contained in another.
// operates the opposite of contains
const isDisjointed = geometryEngine.disjoint(polygon, boundaryPolygon);

distance Method distance(geometry1, geometry2, distanceUnit){Number}

Calculates the shortest planar distance between two geometries. Distance is reported in the linear units specified by distanceUnit or, if distanceUnit is null, the units of the spatialReference of input geometry.

To calculate the geodesic distance between two points, first construct a Polyline using the two points of interest as the beginning and ending points of a single path. Then use the polyline as input for the geodesicLength() method.

Parameters

geometry1 Geometry

First input geometry.

geometry2 Geometry

Second input geometry.

distanceUnit LinearUnits

optional

Measurement unit of the return value. Defaults to the units of the input geometries.

Returns

Type	Description
Number	Distance between the two input geometries.

See also

geometryEngineAsync.distance()

Example

// returns numeric distance between two points
const totalDistance = geometryEngine.distance(point1, point2, "feet");

equals Method equals(geometry1, geometry2){Boolean}

Indicates if two geometries are equal.

Parameters

geometry1 Geometry

First input geometry.

geometry2 Geometry

Second input geometry.

Returns

Type	Description
Boolean	Returns `true` if the two input geometries are equal.

See also

geometryEngineAsync.equals()

Example

// returns true if two given geometries are equal
const isEqual = geometryEngine.equals(line1, line2);

extendedSpatialReferenceInfo Method extendedSpatialReferenceInfo(spatialReference){SpatialReferenceInfo}

Returns an object containing additional information about the input spatial reference.

Parameter

spatialReference SpatialReference

The input spatial reference.

Returns

Type	Description
SpatialReferenceInfo	Resolves to a SpatialReferenceInfo object.

See also

flipHorizontal Method flipHorizontal(geometry, flipOrigin){Geometry}

Flips a geometry on the horizontal axis. Can optionally be flipped around a point.

Parameters

geometry Geometry

The input geometry to be flipped.

flipOrigin Point

optional

Point to flip the geometry around. Defaults to the centroid of the geometry.

Returns

Type	Description
Geometry	The flipped geometry.

See also

geometryEngineAsync.flipHorizontal()

Example

// Returns a geometry flipped horizontally
const geometry = geometryEngine.flipHorizontal(boundaryPolygon);

flipVertical Method flipVertical(geometry, flipOrigin){Geometry}

Flips a geometry on the vertical axis. Can optionally be flipped around a point.

Parameters

geometry Geometry

The input geometry to be flipped.

flipOrigin Point

optional

Point to flip the geometry around. Defaults to the centroid of the geometry.

Returns

Type	Description
Geometry	The flipped geometry.

See also

geometryEngineAsync.flipVertical()

Example

// Returns a geometry flipped vertically
const geometry = geometryEngine.flipVertical(boundaryPolygon);

generalize Method generalize(geometry, maxDeviation, removeDegenerateParts, maxDeviationUnit){Geometry}

Performs the generalize operation on the geometries in the cursor. Point and Multipoint geometries are left unchanged. Envelope is converted to a Polygon and then generalized.

Parameters

geometry Geometry

The input geometry to be generalized.

maxDeviation Number

The maximum allowed deviation from the generalized geometry to the original geometry.

removeDegenerateParts Boolean

optional

When true the degenerate parts of the geometry will be removed from the output (may be undesired for drawing).

maxDeviationUnit LinearUnits

optional

Measurement unit for maxDeviation. Defaults to the units of the input geometry.

Returns

Type	Description
Geometry	The generalized geometry.

See also

geometryEngineAsync.generalize()

Example

// Returns a generalized geometry
const geometry = geometryEngine.generalize(boundaryPolygon, 2.5, true, "miles");

geodesicArea Method geodesicArea(geometry, unit){Number}

Calculates the area of the input geometry. As opposed to planarArea(), geodesicArea takes into account the curvature of the earth when performing this calculation. Therefore, when using input geometries with a spatial reference of either WGS84 (wkid: 4326) or Web Mercator, it is best practice to calculate areas using geodesicArea(). If the input geometries have a projected coordinate system other than Web Mercator, use planarArea() instead.

This method only works with WGS84 (wkid: 4326) and Web Mercator spatial references.

Parameters

geometry Polygon

The input polygon.

unit AreaUnits

optional

Measurement unit of the return value. Defaults to the units of the input geometries.

Returns

Type	Description
Number	Area of the input geometry.

See also

geometryEngineAsync.geodesicArea()

Example

// Returns the numeric geodesic area of the given polygon
const area = geometryEngine.geodesicArea(boundaryPolygon, "square-miles");

geodesicBuffer Method geodesicBuffer(geometry, distance, unit, unionResults){Polygon |Polygon[]}

Creates geodesic buffer polygons at a specified distance around the input geometries. When calculating distances, this method takes the curvature of the earth into account, which provides highly accurate results when dealing with very large geometries and/or geometries that spatially vary on a global scale where one projected coordinate system could not accurately plot coordinates and measure distances for all the geometries.

This method only works with WGS84 (wkid: 4326) and Web Mercator spatial references. In general, if your input geometries are assigned one of those two spatial references, you should always use geodesicBuffer() to obtain the most accurate results for those geometries. If needing to buffer points assigned a projected coordinate system other than Web Mercator, use buffer() instead. If the input geometries have a geographic coordinate system other than WGS84 (wkid: 4326), use geometryService.buffer().

Parameters

geometry Geometry|Geometry []

The buffer input geometry. The geometry and distance parameters must be specified as either both arrays or both non-arrays. Never specify one as an array and the other a non-array.

distance Number|Number []

unit LinearUnits

optional

Measurement unit of the distance(s). Defaults to the units of the input geometries.

unionResults Boolean

optional

Default Value: false

Determines whether the output geometries should be unioned into a single polygon.

Returns

Type	Description
Polygon \| Polygon []	The resulting buffer(s). The result will be an array if an array of geometries is used as input. It will be a single polygon if a single geometry is input into the function.

See also

geometryEngineAsync.geodesicBuffer()

Example

// point is a Point geometry
const ptBuff = geometryEngine.geodesicBuffer(point, 1000, "kilometers");  // Buffer point by 1000km

geodesicDensify Method geodesicDensify(geometry, maxSegmentLength, maxSegmentLengthUnit){Geometry}

Returns a geodetically densified version of the input geometry. Use this function to draw the line(s) of the geometry along great circles.

Parameters

geometry Polyline|Polygon

A polyline or polygon to densify.

maxSegmentLength Number

The maximum segment length allowed (in meters if a maxSegmentLengthUnit is not provided). This must be a positive value.

maxSegmentLengthUnit LinearUnits

optional

Measurement unit for maxSegmentLength. If not provided, the unit will default to meters.

Returns

Type	Description
Geometry	Returns the densified geometry.

See also

geometryEngineAsync.geodesicDensify()

Example

// lineGeom is a line geometry
const densifiedGeom = geometryEngine.geodesicDensify(lineGeom, 10000);

geodesicLength Method geodesicLength(geometry, unit){Number}

Calculates the length of the input geometry. As opposed to planarLength(), geodesicLength() takes into account the curvature of the earth when performing this calculation. Therefore, when using input geometries with a spatial reference of either WGS84 (wkid: 4326) or Web Mercator, it is best practice to calculate lengths using geodesicLength(). If the input geometries have a projected coordinate system other than Web Mercator, use planarLength() instead.

This method only works with WGS84 (wkid: 4326) and Web Mercator spatial references.

Parameters

geometry Geometry

The input geometry.

unit LinearUnits

optional

Measurement unit of the return value. Defaults to the units of the input geometry.

Returns

Type	Description
Number	Length of the input geometry.

See also

geometryEngineAsync.geodesicLength()

Example

// Returns the numeric geodesic length of the given line
const length = geometryEngine.geodesicLength(riverGeometry, "miles");

intersect Method intersect(geometry1, geometry2){Geometry |Geometry[]}

Creates new geometries from the intersections between two geometries. If the input geometries have different dimensions (i.e. point = 0; polyline = 1; polygon = 2), then the result's dimension will be equal to the lowest dimension of the inputs. The table below describes the expected output for various combinations of geometry types. Note that geometry1 and geometry2 are interchangeable in this operation and will return the same result if flipped.

Geometry1 type	Geometry2 type	Result geometry type
Polygon	Polygon	Polygon
Polygon	Polyline	Polyline
Polygon	Point	Point
Polyline	Polyline	Polyline
Polyline	Point	Point
Point	Point	Point

Note that two intersecting polylines will not return Point geometries. Rather, this function will return Polyline paths that are equal between the two geometries. See intersectLinesToPoints() to find the point intersections of two polylines.

Parameters

geometry1 Geometry|Geometry []

The input geometry or array of geometries.

geometry2 Geometry

The geometry to intersect with geometry1.

Returns

Type	Description
Geometry \| Geometry []	The intersections of the geometries.

See also

Example

// Creates a new geometry from the intersection
// of the two geometries
const intersecting = geometryEngine.intersect(boundaryPolygon, buffers);

intersectLinesToPoints Method intersectLinesToPoints(line1, line2){Point[]} Since: ArcGIS Maps SDK for JavaScript 4.25 geometryEngine since 4.0, intersectLinesToPoints added at 4.25.

Returns an array of points at the intersecting locations of two input polylines. Use intersect for all other geometry intersect operations.

Parameters

line1 Polyline

The first polyline to use in the intersect operation.

line2 Polyline

The second polyline to use in the intersect operation.

Returns

Type	Description
Point []	The point intersections of the input polylines.

See also

Example

// Creates an array of points for the intersections of the input lines
const intersections = geometryEngine.intersectLinesToPoints(line1, line2);

intersects Method intersects(geometry1, geometry2){Boolean}

Indicates if one geometry intersects another geometry.

Parameters

geometry1 Geometry

The geometry that is tested for the intersects relationship to the other geometry.

geometry2 Geometry

The geometry being intersected.

Returns

Type	Description
Boolean	Returns `true` if the input geometries intersect each other.

See also

geometryEngineAsync.intersects()

Example

// returns true if two given geometries intersect each other
const isIntersecting = geometryEngine.intersects(boundaryPolygon, cityPolygon);

isSimple Method isSimple(geometry){Boolean}

Indicates if the given geometry is topologically simple. In a simplified geometry, no polygon rings or polyline paths will overlap, and no self-intersection will occur.

Parameter

geometry Geometry

The input geometry.

Returns

Type	Description
Boolean	Returns `true` if the geometry is topologically simple.

See also

geometryEngineAsync.isSimple()

Example

// returns true if given geometry is simple
const simple = geometryEngine.isSimple(polyline);

nearestCoordinate Method nearestCoordinate(geometry, inputPoint){NearestPointResult}

Finds the coordinate of the geometry that is closest to the specified point.

Parameters

geometry Geometry

The geometry to consider.

inputPoint Point

The point used to search the nearest coordinate in the geometry.

Returns

Type	Description
NearestPointResult	Returns an object containing the nearest coordinate.

See also

geometryEngineAsync.nearestCoordinate()

nearestVertex Method nearestVertex(geometry, inputPoint){NearestPointResult}

Finds the vertex on the geometry nearest to the specified point.

Parameters

geometry Geometry

The geometry to consider.

inputPoint Point

The point used to search the nearest vertex in the geometry.

Returns

Type	Description
NearestPointResult	Returns an object containing the nearest vertex.

See also

geometryEngineAsync.nearestVertex()

Example

// Finds the nearest vertex of the polygon to the input point
const {
 coordinate,
 distance
} = geometryEngine.nearestVertex(boundaryPolygon, point);

nearestVertices Method nearestVertices(geometry, inputPoint, searchRadius, maxVertexCountToReturn){NearestPointResult[]}

Finds all vertices in the given distance from the specified point, sorted from the closest to the furthest and returns them as an array of Objects.

Parameters

geometry Geometry

The geometry to consider.

inputPoint Point

The point from which to measure.

searchRadius Number

The distance to search from the inputPoint in the units of the view's spatial reference.

maxVertexCountToReturn Number

The maximum number of vertices to return.

Returns

Type	Description
NearestPointResult []	An array of objects containing the nearest vertices within the given `searchRadius`.

See also

geometryEngineAsync.nearestVertices()

Example

// Returns an array of the nearest vertices
const nearest = geometryEngine.nearestVertices(boundaryPolygon, point, 500, 2);

offset Method offset(geometry, offsetDistance, offsetUnit, joinType, bevelRatio, flattenError){Geometry |Geometry[]}

The offset operation creates a geometry that is a constant planar distance from an input polyline or polygon. It is similar to buffering, but produces a one-sided result.

Parameters

geometry Geometry|Geometry []

The geometries to offset.

offsetDistance Number

The planar distance to offset from the input geometry. If offsetDistance > 0, then the offset geometry is constructed to the right of the oriented input geometry, if offsetDistance = 0, then there is no change in the geometries, otherwise it is constructed to the left. For a simple polygon, the orientation of outer rings is clockwise and for inner rings it is counter clockwise. So the "right side" of a simple polygon is always its inside.

offsetUnit LinearUnits

optional

Measurement unit of the offset distance. Defaults to the units of the input geometries.

joinType String

optional

The join type.

Possible Values:"round"|"bevel"|"miter"|"square"

bevelRatio Number

optional

Applicable when joinType = 'miter'; bevelRatio is multiplied by the offset distance and the result determines how far a mitered offset intersection can be located before it is beveled.

flattenError Number

optional

Applicable when joinType = 'round'; flattenError determines the maximum distance of the resulting segments compared to the true circular arc. The algorithm never produces more than around 180 vertices for each round join.

Returns

Type	Description
Geometry \| Geometry []	The offset geometries.

See also

geometryEngineAsync.offset()

Example

// Creates a new geometry offset from the provided geometry
const offset = geometryEngine.offset(boundaryPolygon, 500, "meters", "round");

overlaps Method overlaps(geometry1, geometry2){Boolean}

Indicates if one geometry overlaps another geometry.

Parameters

geometry1 Geometry

The base geometry that is tested for the "overlaps" relationship with the other geometry.

geometry2 Geometry

The comparison geometry that is tested for the "overlaps" relationship with the other geometry.

Returns

Type	Description
Boolean	Returns `true` if the two geometries overlap.

See also

geometryEngineAsync.overlaps()

Example

// returns true if one geometry overlaps another,
// but is not contained or disjointed
const isOverlapping = geometryEngine.overlaps(polygon, boundaryPolygon);

planarArea Method planarArea(geometry, unit){Number}

Calculates the area of the input geometry. As opposed to geodesicArea(), planarArea() performs this calculation using projected coordinates and does not take into account the earth's curvature. When using input geometries with a spatial reference of either WGS84 (wkid: 4326) or Web Mercator, it is best practice to calculate areas using geodesicArea(). If the input geometries have a projected coordinate system other than Web Mercator, use planarArea() instead.

Parameters

geometry Polygon

The input polygon.

unit AreaUnits

optional

Measurement unit of the return value. Defaults to the units of the input geometries.

Returns

Type	Description
Number	The area of the input geometry.

See also

geometryEngineAsync.planarArea()

Example

// Returns the numeric area of the given polygon
const area = geometryEngine.planarArea(boundaryPolygon, "square-miles");

planarLength Method planarLength(geometry, unit){Number}

Calculates the length of the input geometry. As opposed to geodesicLength(), planarLength() uses projected coordinates and does not take into account the curvature of the earth when performing this calculation. When using input geometries with a spatial reference of either WGS84 (wkid: 4326) or Web Mercator, it is best practice to calculate lengths using geodesicLength(). If the input geometries have a projected coordinate system other than Web Mercator, use planarLength() instead.

Parameters

geometry Geometry

The input geometry.

unit LinearUnits

optional

Measurement unit of the return value. Defaults to the units of the input geometries.

Returns

Type	Description
Number	The length of the input geometry.

See also

geometryEngineAsync.planarLength()

Example

// Returns the numeric length of the given line
const length = geometryEngine.planarLength(riverGeometry, "miles");

relate Method relate(geometry1, geometry2, relation){Boolean}

Indicates if the given DE-9IM relation is true for the two geometries.

Parameters

geometry1 Geometry

The first geometry for the relation.

geometry2 Geometry

The second geometry for the relation.

relation String

The Dimensionally Extended 9 Intersection Model (DE-9IM) matrix relation (encoded as a string) to test against the relationship of the two geometries. This string contains the test result of each intersection represented in the DE-9IM matrix. Each result is one character of the string and may be represented as either a number (maximum dimension returned: 0,1,2), a Boolean value (T or F), or a mask character (for ignoring results: '*'). For example, each of the following DE-9IM string codes are valid for testing whether a polygon geometry completely contains a line geometry: TTTFFTFFT (Boolean), 'T******FF*' (ignore irrelevant intersections), or '102FF*FF*' (dimension form). Each returns the same result. See this article and this ArcGIS help page for more information about the DE-9IM model and how string codes are constructed.

Returns

Type	Description
Boolean	Returns `true` if the relation of the input geometries is accurate.

See also

geometryEngineAsync.relate()

Example

// returns true if the polygon geometry completely
// contains the polyline based on the DE-9IM string
const isRelated = geometryEngine.relate(polygon, polyline, "TTTFFTFFT");

rotate Method rotate(geometry, angle, rotationOrigin){Geometry}

Rotates a geometry counterclockwise by the specified number of degrees. Rotation is around the centroid, or a given rotation point.

Parameters

geometry Geometry

The geometry to rotate.

angle Number

The rotation angle in degrees.

rotationOrigin Point

optional

Point to rotate the geometry around. Defaults to the centroid of the geometry.

Returns

Type	Description
Geometry	The rotated geometry.

See also

geometryEngineAsync.rotate()

Example

// Returns a geometry rotated by 45 degrees
const geometry = geometryEngine.rotate(boundaryPolygon, 45);

simplify Method simplify(geometry){Geometry}

Performs the simplify operation on the geometry, which alters the given geometries to make their definitions topologically legal with respect to their geometry type. At the end of a simplify operation, no polygon rings or polyline paths will overlap, and no self-intersection will occur.

Parameter

geometry Geometry

The geometry to be simplified.

Returns

Type	Description
Geometry	The simplified geometry.

See also

geometryEngineAsync.simplify()

Example

// Topologically simplifies a geometry
const simplified = geometryEngine.simplify(polyline);
console.log(geometryEngine.isSimple(simplified)); // true

symmetricDifference Method symmetricDifference(leftGeometry, rightGeometry){Geometry |Geometry[]}

Creates the symmetric difference of two geometries. The symmetric difference includes the parts that are in either of the sets, but not in both.

Parameters

leftGeometry Geometry|Geometry []

One of the Geometry instances in the XOR operation.

rightGeometry Geometry

One of the Geometry instances in the XOR operation.

Returns

Type	Description
Geometry \| Geometry []	The symmetric differences of the two geometries.

See also

geometryEngineAsync.symmetricDifference()

Example

// Creates a new geometry based on the
// symmetric difference of the two
const geometry = geometryEngine.symmetricDifference(boundaryPolygon, buffers);

touches Method touches(geometry1, geometry2){Boolean}

Indicates if one geometry touches another geometry.

Parameters

geometry1 Geometry

The geometry to test the "touches" relationship with the other geometry.

geometry2 Geometry

The geometry to be touched.

Returns

Type	Description
Boolean	When `true`, `geometry1` touches `geometry2`.

See also

geometryEngineAsync.touches()

Example

// returns true if the line vertex touches the edge of the polygon
const isTouching = geometryEngine.touches(polygon, line);

union Method union(geometries){Geometry}

All inputs must be of the same type of geometries and share one spatial reference.

Parameter

geometries Geometry []

An array of Geometries to union.

Returns

Type	Description
Geometry	The union of the geometries.

See also

geometryEngineAsync.union()

Example

// pt1 and pt2 are Point geometries to union together
const union = geometryEngine.union([pt1, pt2]);

within Method within(innerGeometry, outerGeometry){Boolean}

Indicates if one geometry is within another geometry.

Parameters

innerGeometry Geometry

The base geometry that is tested for the "within" relationship to the other geometry.

outerGeometry Geometry

The comparison geometry that is tested for the "contains" relationship to the other geometry.

Returns

Type	Description
Boolean	Returns `true` if `innerGeometry` is within `outerGeometry`.

See also

geometryEngineAsync.within()

Example

// returns true if a geometry is completely within another
const isWithin = geometryEngine.within(polygon, boundaryPolygon);

Type Definitions

AreaUnits Type Definition AreaUnits String |Number

Units for area measurements. Use one of the string values below or a numerical value from here or here.

LinearUnits Type Definition LinearUnits String |Number

Units for linear measurements. Use one of the string values below or a numerical value from here or here.

NearestPointResult Type Definition NearestPointResult

Object returned from the nearestCoordinate(), nearestVertex(), and nearestVertices() methods.

Properties: coordinate Point

A vertex within the specified distance of the search.

distance Number

The distance from the inputPoint in the units of the view's spatial reference.

vertexIndex Number

The index of the vertex within the geometry's rings or paths.

isEmpty Boolean

Indicates if it is an empty geometry.

SpatialReferenceInfo Type Definition SpatialReferenceInfo

The return object of the extendedSpatialReferenceInfo() method.

Properties

tolerance Number

The XY tolerance of the spatial reference.

unitBaseFactor Number

Base factor.

unitID Number

Unit ID.

unitSquareDerivative Number

Square derivative.

unitType Number

Unit type.

See also

geometryEngine.extendedSpatialReferenceInfo()