VectorFieldRenderer | API Reference | ArcGIS Maps SDK for JavaScript 4.31

The VectorFieldRenderer allows you to display your raster data with vector symbols. This renderer is often used for visualizing flow direction and magnitude information in meteorology and oceanography raster data. It can also be used to symbolize a single raster layer where the symbols are scalar. The direction of the raster defines the angles, while the magnitude of the raster defines the size of the symbol.

Known Limitations

The VectorFieldRenderer is only supported with ImageryLayer and ImageryTileLayer.
The VectorFieldRenderer is only supported in 2D MapView.
The visualVariables set on the VectorFieldRenderer are not supported in the Legend.

See also

Sample - Visualizing wind data with VectorFieldRenderer

Example

const renderer = new VectorFieldRenderer({
  style: "beaufort-kn", // Beaufort point symbol (knots)
  flowRepresentation: "flow-from", // show flow to angle for wind direction
  symbolTileSize: 10, // draw one symbol in every 10x10 pixels
   visualVariables: [
     {
       type: "size",
       field: "Magnitude", // values read from the first band
       maxDataValue: 32,
       maxSize: "100px",
       minDataValue: 0.04,
       minSize: "8px"
     },
     {
       type: "rotation",
       field: "Direction", // values read from the second band
       rotationType: "geographic"
     }
   ]
});

Constructors

VectorFieldRenderer Constructor new VectorFieldRenderer(properties)

Parameter

properties Object

optional

See the properties for a list of all the properties that may be passed into the constructor.

Property Overview

Any properties can be set, retrieved or listened to. See the Watch for changes topic.

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Type	Summary	Class
String	Attribute field presenting the magnitude.	VectorFieldRenderer
String	The name of the class.	Accessor
String	Defines the flow direction of the data.	VectorFieldRenderer
String	Predefined symbol styles used to represent the vector flow.	VectorFieldRenderer
Number	Determines the density of the symbols.	VectorFieldRenderer
String	The type of Renderer.	VectorFieldRenderer
VisualVariable []\|null	An array of VisualVariable objects.	VectorFieldRenderer

Property Details

attributeField Property attributeField String

Attribute field presenting the magnitude.

For VectorFieldRenderer the attributeField is always "Magnitude".

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor

The name of the class. The declared class name is formatted as esri.folder.className.

flowRepresentation Property flowRepresentation String

Defines the flow direction of the data. If you have a data showing wind direction, it is recommended to use flow-to to show the natural flow direction of the wind on the map.

Value	Description
flow-from	VectorFieldRenderer symbol style point towards the direction of the data.
flow-to	VectorFieldRenderer symbol style point to the opposite direction of the data.

Possible Values:"flow-from" |"flow-to"

Default Value:"flow-from"

style Property style String

Predefined symbol styles used to represent the vector flow.

Value	Description
beaufort-ft	Beaufort point symbol (feet)
beaufort-km	Beaufort point symbol (kilometers)
beaufort-kn	Beaufort point symbol (knots)
beaufort-m	Beaufort point symbol (meters)
beaufort-mi	Beaufort point symbol (miles)
classified-arrow	Classified arrow point symbol
ocean-current-kn	Ocean current point symbol (knots)
ocean-current-m	Ocean current point symbol (meters)
simple-scalar	Simple scalar point symbol
single-arrow	Single arrow point symbol
wind-barb	Barb wind speed point symbol

Default Value:"single-arrow"

symbolTileSize Property symbolTileSize Number

Determines the density of the symbols. Larger tile size, fewer symbols. The VectorFieldRenderer draws one symbol within a defined tile size (in screen pixels).

Default Value:50

type Property type Stringreadonly

The type of Renderer.

For VectorFieldRenderer the type is always "vector-field".

visualVariables Property visualVariables VisualVariable[] |nullautocast Autocasts from Object []

An array of VisualVariable objects. Each object must indicate the type of visual variable to apply (e.g. SizeVisualVariable, RotationVisualVariable), the numeric field or expression from which to drive the visualization, and the visual values to map to the data.

When setting fields for the visual variables set on the VectorFieldRenderer, use Magnitude and Direction fields. Magnitude will return pixel values from the first band. Direction will return values from the second band. If the data represents u (zonal) and v (meridional) speed components, values are automatically converted to Magnitude and Direction.

See also

Example

const renderer = new VectorFieldRenderer({
  style: "beaufort-kn", // Beaufort point symbol (knots)
  flowRepresentation: "flow-from", // show flow to angle for wind direction
  symbolTileSize: 10, // controls the density of the displayed vector symbols.
   visualVariables: [
     {
       type: "size",
       field: "Magnitude", // values read from the first band
       maxDataValue: 32,
       maxSize: "100px",
       minDataValue: 0.04,
       minSize: "8px"
     },
     {
       type: "rotation",
       field: "Direction", // values read from the second band
       rotationType: "geographic"
     }
   ]
});

Method Overview

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Return Type	Summary	Class
	Adds one or more handles which are to be tied to the lifecycle of the object.	Accessor
VectorFieldRenderer	Creates a deep clone of the renderer.	VectorFieldRenderer
*	Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product.	VectorFieldRenderer
Boolean	Returns true if a named group of handles exist.	Accessor
	Removes a group of handles owned by the object.	Accessor
Object	Converts an instance of this class to its ArcGIS portal JSON representation.	VectorFieldRenderer

Method Details

addHandles Inherited Method addHandles(handleOrHandles, groupKey) Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, addHandles added at 4.25.

Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.

// Manually manage handles
const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true }
);

this.addHandles(handle);

// Destroy the object
this.destroy();

Parameters

handleOrHandles WatchHandle|WatchHandle []

Handles marked for removal once the object is destroyed.

groupKey *

optional

Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.

clone Method clone(){VectorFieldRenderer}

Creates a deep clone of the renderer.

Returns

Type	Description
VectorFieldRenderer	A deep clone of the object that invoked this method.

Example

// Creates a deep clone of the first layer's renderer
let renderer = view.map.layers.at(0).renderer.clone();

fromJSON Method fromJSON(json){*}static

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product. The object passed into the input json parameter often comes from a response to a query operation in the REST API or a toJSON() method from another ArcGIS product. See the Using fromJSON() topic in the Guide for details and examples of when and how to use this function.

Parameter

json Object

A JSON representation of the instance in the ArcGIS format. See the ArcGIS REST API documentation for examples of the structure of various input JSON objects.

Returns

Type	Description
*	Returns a new instance of this class.

hasHandles Inherited Method hasHandles(groupKey){Boolean} Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, hasHandles added at 4.25.

Returns true if a named group of handles exist.

Parameter

groupKey *

optional

A group key.

Returns

Type	Description
Boolean	Returns `true` if a named group of handles exist.

Example

// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}

removeHandles Inherited Method removeHandles(groupKey) Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, removeHandles added at 4.25.

Removes a group of handles owned by the object.

Parameter

groupKey *

optional

A group key or an array or collection of group keys to remove.

Example

obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");

toJSON Method toJSON(){Object}

Converts an instance of this class to its ArcGIS portal JSON representation. See the Using fromJSON() guide topic for more information.

Returns

Type	Description
Object	The ArcGIS portal JSON representation of an instance of this class.