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Image overlays | Maps JavaScript API

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google.maps.MapType interface

This interface defines the map type, and is typically used for custom map types. Immutable.

Type:  number

The maximum zoom level for the map when displaying this MapType. Required for base MapTypes, ignored for overlay MapTypes.

Type:  number

The minimum zoom level for the map when displaying this MapType. Optional; defaults to 0.

Type:  number

Radius of the planet for the map, in meters. Optional; defaults to Earth's equatorial radius of 6378137 meters.

Type:  string optional

Alt text to display when this MapType's button is hovered over in the MapTypeControl. Optional.

Type:  string optional

Name to display in the MapTypeControl. Optional.

The Projection used to render this MapType. Optional; defaults to Mercator.

The dimensions of each tile. Required.

getTile(tileCoord, zoom, ownerDocument)

• tileCoord:  Point Tile coordinates.
• zoom:  number Tile zoom.
• ownerDocument:  Document The document which owns this tile.

Resulting tile.

Returns a tile for the given tile coordinate (x, y) and zoom level. This tile will be appended to the given ownerDocument. Not available for base map types.

releaseTile(tile)

• tile:  Element optional Tile to release.

Return Value:  void

Releases the given tile, performing any necessary cleanup. The provided tile will have already been removed from the document. Optional.

google.maps.Projection interface

fromLatLngToPoint(latLng[, point])

• latLng:  LatLng|LatLngLiteral
• point:  Point optional

Translates from the LatLng cylinder to the Point plane. This interface specifies a function which implements translation from given LatLng values to world coordinates on the map projection. The Maps API calls this method when it needs to plot locations on screen. Projection objects must implement this method, but may return null if the projection cannot calculate the Point.

fromPointToLatLng(pixel[, noClampNoWrap])

• pixel:  Point
• noClampNoWrap:  boolean optional

This interface specifies a function which implements translation from world coordinates on a map projection to LatLng values. The Maps API calls this method when it needs to translate actions on screen to positions on the map. Projection objects must implement this method, but may return null if the projection cannot calculate the LatLng.

google.maps.ImageMapType class

This class implements the MapType interface and is provided for rendering image tiles.

This class extends MVCObject.

This class implements MapType.

Access by calling const {ImageMapType} = await google.maps.importLibrary("maps").
See Libraries in the Maps JavaScript API.

getOpacity()

Parameters:  None

Return Value:  number opacity The current opacity.

Returns the opacity level (0 (transparent) to 1.0) of the ImageMapType tiles.

getTile(tileCoord, zoom, ownerDocument)

• tileCoord:  Point Tile coordinates.
• zoom:  number Tile zoom.
• ownerDocument:  Document The document which owns this tile.

Resulting tile.

releaseTile(tileDiv)

• tileDiv:  Element optional Tile to release.

Return Value:  None

setOpacity(opacity)

• opacity:  number The new opacity.

Return Value:  None

Sets the opacity level (0 (transparent) to 1.0) of the ImageMapType tiles.

function()

Arguments:  None

This event is fired when the visible tiles have finished loading.

google.maps.ImageMapTypeOptions interface

This class is used to create a MapType that renders image tiles.

Type:  string optional

Alt text to display when this MapType's button is hovered over in the MapTypeControl.

Returns a string (URL) for given tile coordinate (x, y) and zoom level.

Type:  number optional

The maximum zoom level for the map when displaying this MapType.

Type:  number optional

The minimum zoom level for the map when displaying this MapType. Optional.

Type:  string optional

Name to display in the MapTypeControl.

Type:  number optional

The opacity to apply to the tiles. The opacity should be specified as a float value between 0 and 1.0, where 0 is fully transparent and 1 is fully opaque.

The tile size.

google.maps.GroundOverlay class

A rectangular image overlay on the map.

This class extends MVCObject.

Access by calling const {GroundOverlay} = await google.maps.importLibrary("maps").
See Libraries in the Maps JavaScript API.

GroundOverlay(url, bounds[, opts])

• url:  string
• bounds:  LatLngBounds|LatLngBoundsLiteral
• opts:  GroundOverlayOptions optional

Creates a ground overlay from the provided image URL and its LatLngBounds. The image is scaled to fit the current bounds, and projected using the current map projection.

getBounds()

Parameters:  None

Gets the LatLngBounds of this overlay.

getMap()

Parameters:  None

Returns the map on which this ground overlay is displayed.

getOpacity()

Parameters:  None

Return Value:  number

Returns the opacity of this ground overlay.

getUrl()

Parameters:  None

Return Value:  string

Gets the url of the projected image.

setMap(map)

• map:  Map

Return Value:  None

Renders the ground overlay on the specified map. If map is set to null, the overlay is removed.

setOpacity(opacity)

• opacity:  number

Return Value:  None

Sets the opacity of this ground overlay.

function(event)

• event:  MapMouseEvent

This event is fired when the DOM click event is fired on the GroundOverlay.

function(event)

• event:  MapMouseEvent

This event is fired when the DOM dblclick event is fired on the GroundOverlay.

google.maps.GroundOverlayOptions interface

This object defines the properties that can be set on a GroundOverlay object.

Type:  boolean optional

If true, the ground overlay can receive mouse events.

The map on which to display the overlay.

Type:  number optional

Default: 1.0

The opacity of the overlay, expressed as a number between 0 and 1. Optional.

google.maps.StyledMapType class

Creates a MapType with a custom style.

This class extends MVCObject.

This class implements MapType.

Access by calling const {StyledMapType} = await google.maps.importLibrary("maps").
See Libraries in the Maps JavaScript API.

StyledMapType(styles[, options])

• styles:  Array<MapTypeStyle>
• options:  StyledMapTypeOptions optional

Creates a styled

with the specified options. The

takes an array of

s, where each

is applied to the map consecutively. A later

that applies the same

s to the same selectors as an earlier

will override the earlier

.

Note that the StyledMapType is not supported when a map ID is set. When using both together, you will receive a console warning.

google.maps.StyledMapTypeOptions interface

This class is used to specify options when creating a StyledMapType. These options cannot be changed after the StyledMapType is instantiated.

Type:  string optional

Text to display when this MapType's button is hovered over in the map type control.

Type:  number optional

The maximum zoom level for the map when displaying this MapType. Optional.

Type:  number optional

The minimum zoom level for the map when displaying this MapType. Optional.

Type:  string optional

The name to display in the map type control.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-07-09 UTC.

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