KBE3D / KBCore / Cesium / GoogleEarthEnterpriseTerrainData

类: GoogleEarthEnterpriseTerrainData

Terrain data for a single tile from a Google Earth Enterprise server.

示例

const buffer = ...
const childTileMask = ...
const terrainData = new Cesium.GoogleEarthEnterpriseTerrainData({
  buffer : heightBuffer,
  childTileMask : childTileMask
});

参数

Object with the following properties:

参数

The buffer containing terrain data.

参数

Multiplier for negative terrain heights that are encoded as very small positive values.

参数

Threshold for negative values

参数

A bit mask indicating which of this tile's four children exist. If a child's bit is set, geometry will be requested for that tile as well when it is needed. If the bit is cleared, the child tile is not requested and geometry is instead upsampled from the parent. The bit values are as follows: <table> <tr><th>Bit Position</th><th>Bit Value</th><th>Child Tile</th></tr> <tr><td>0</td><td>1</td><td>Southwest</td></tr> <tr><td>1</td><td>2</td><td>Southeast</td></tr> <tr><td>2</td><td>4</td><td>Northeast</td></tr> <tr><td>3</td><td>8</td><td>Northwest</td></tr> </table>

参数

True if this instance was created by upsampling another instance; otherwise, false.

参数

Array of credits for this tile.

属性

credits

credits: Credit[]

An array of credits for this tile

---

waterMask

waterMask: HTMLCanvasElement | HTMLImageElement | Uint8Array<ArrayBufferLike> | undefined

The water mask included in this terrain data, if any. A water mask is a rectangular Uint8Array or image where a value of 255 indicates water and a value of 0 indicates land. Values in between 0 and 255 are allowed as well to smoothly blend between land and water.

方法

interpolateHeight()

interpolateHeight(rectangle: Rectangle, longitude: number, latitude: number): number

Computes the terrain height at a specified longitude and latitude.

参数

rectangle

Rectangle

The rectangle covered by this terrain data.

longitude

number

The longitude in radians.

latitude

number

The latitude in radians.

返回

number

The terrain height at the specified position. If the position is outside the rectangle, this method will extrapolate the height, which is likely to be wildly incorrect for positions far outside the rectangle.

---

upsample()

upsample(tilingScheme: TilingScheme, thisX: number, thisY: number, thisLevel: number, descendantX: number, descendantY: number, descendantLevel: number): Promise<HeightmapTerrainData> | undefined

Upsamples this terrain data for use by a descendant tile. The resulting instance will contain a subset of the height samples in this instance, interpolated if necessary.

参数

tilingScheme

TilingScheme

The tiling scheme of this terrain data.

thisX

number

The X coordinate of this tile in the tiling scheme.

thisY

number

The Y coordinate of this tile in the tiling scheme.

thisLevel

number

The level of this tile in the tiling scheme.

descendantX

number

The X coordinate within the tiling scheme of the descendant tile for which we are upsampling.

descendantY

number

The Y coordinate within the tiling scheme of the descendant tile for which we are upsampling.

descendantLevel

number

The level within the tiling scheme of the descendant tile for which we are upsampling.

返回

Promise<HeightmapTerrainData> | undefined

A promise for upsampled heightmap terrain data for the descendant tile, or undefined if too many asynchronous upsample operations are in progress and the request has been deferred.

---

isChildAvailable()

isChildAvailable(thisX: number, thisY: number, childX: number, childY: number): boolean

Determines if a given child tile is available, based on the GoogleEarthEnterpriseTerrainData.childTileMask. The given child tile coordinates are assumed to be one of the four children of this tile. If non-child tile coordinates are given, the availability of the southeast child tile is returned.

参数

thisX

number

The tile X coordinate of this (the parent) tile.

thisY

number

The tile Y coordinate of this (the parent) tile.

childX

number

The tile X coordinate of the child tile to check for availability.

childY

number

The tile Y coordinate of the child tile to check for availability.

返回

boolean

True if the child tile is available; otherwise, false.

---

wasCreatedByUpsampling()

wasCreatedByUpsampling(): boolean

Gets a value indicating whether or not this terrain data was created by upsampling lower resolution terrain data. If this value is false, the data was obtained from some other source, such as by downloading it from a remote server. This method should return true for instances returned from a call to HeightmapTerrainData#upsample.

返回

boolean

True if this instance was created by upsampling; otherwise, false.

构造函数

构造函数

new GoogleEarthEnterpriseTerrainData(options: { buffer: ArrayBuffer; negativeAltitudeExponentBias: number; negativeElevationThreshold: number; childTileMask?: number; createdByUpsampling?: boolean; credits?: Credit[]; }): GoogleEarthEnterpriseTerrainData

参数

options

buffer

ArrayBuffer

negativeAltitudeExponentBias

number

negativeElevationThreshold

number

childTileMask?

number

createdByUpsampling?

boolean

credits?

Credit[]

返回

GoogleEarthEnterpriseTerrainData