单个图块的地形数据,其中地形数据表示为量化网格。量化网格由三个顶点属性组成:经度、纬度和高度。所有属性均表示为 0 到 32767 范围内的 16 位值。图块西南角的经度和纬度为零,东北角为 32767。在图块中的最小高度处高度为零,在图块中的最大高度处高度为 32767。 Terrain data for a single tile where the terrain data is represented as a quantized mesh. A quantized mesh consists of three vertex attributes, longitude, latitude, and height. All attributes are expressed as 16-bit values in the range 0 to 32767. Longitude and latitude are zero at the southwest corner of the tile and 32767 at the northeast corner. Height is zero at the minimum height in the tile and 32767 at the maximum height in the tile.
| 名称 Name | 类型 Type | 说明 Description | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
options |
object |
具有以下属性的对象: Object with the following properties:
|
示例: Example:
const data = new Cesium.QuantizedMeshTerrainData({
minimumHeight : -100,
maximumHeight : 2101,
quantizedVertices : new Uint16Array([// order is SW NW SE NE
// longitude
0, 0, 32767, 32767,
// latitude
0, 32767, 0, 32767,
// heights
16384, 0, 32767, 16384]),
indices : new Uint16Array([0, 3, 1,
0, 2, 3]),
boundingSphere : new Cesium.BoundingSphere(new Cesium.Cartesian3(1.0, 2.0, 3.0), 10000),
orientedBoundingBox : new Cesium.OrientedBoundingBox(new Cesium.Cartesian3(1.0, 2.0, 3.0), Cesium.Matrix3.fromRotationX(Cesium.Math.PI, new Cesium.Matrix3())),
horizonOcclusionPoint : new Cesium.Cartesian3(3.0, 2.0, 1.0),
westIndices : [0, 1],
southIndices : [0, 1],
eastIndices : [2, 3],
northIndices : [1, 3],
westSkirtHeight : 1.0,
southSkirtHeight : 1.0,
eastSkirtHeight : 1.0,
northSkirtHeight : 1.0
});
另见: See:
成员 Members
credits : Array.<Credit>
该图块的一系列制作人员名单。 An array of credits for this tile.
该地形数据中包含的水掩模(如果有)。水蒙版是一个矩形 Uint8Array 或图像,其中值 255 表示水,值 0 表示陆地。 0 到 255 之间的值也允许在陆地和水之间平滑地混合。 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 Methods
计算指定经度和纬度处的地形高度。 Computes the terrain height at a specified longitude and latitude.
| 名称 Name | 类型 Type | 说明 Description |
|---|---|---|
rectangle |
Rectangle | 该地形数据覆盖的矩形。 The rectangle covered by this terrain data. |
longitude |
number | 以弧度表示的经度。 The longitude in radians. |
latitude |
number | 以弧度为单位的纬度。 The latitude in radians. |
返回: Returns:
指定位置的地形高度。该位置被限制在矩形内,因此对于远离矩形的位置,预计会出现错误的结果。 The terrain height at the specified position. The position is clamped to the rectangle, so expect incorrect results for positions far outside the rectangle.
根据以下条件确定给定的子图块是否可用 Determines if a given child tile is available, based on the
QuantizedMeshTerrainData.childTileMask。假定给定的子图块坐标是该图块的四个子图块之一。如果给出非子图块坐标,则返回东南子图块的可用性。 . 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.
| 名称 Name | 类型 Type | 说明 Description |
|---|---|---|
thisX |
number | 此(父)图块的图块 X 坐标。 The tile X coordinate of this (the parent) tile. |
thisY |
number | 此(父)图块的图块 Y 坐标。 The tile Y coordinate of this (the parent) tile. |
childX |
number | 用于检查可用性的子图块的图块 X 坐标。 The tile X coordinate of the child tile to check for availability. |
childY |
number | 用于检查可用性的子图块的图块 Y 坐标。 The tile Y coordinate of the child tile to check for availability. |
返回: Returns:
如果子图块可用,则为 True;否则为假。 True if the child tile is available; otherwise, false.
upsample(tilingScheme, thisX, thisY, thisLevel, descendantX, descendantY, descendantLevel) → Promise.<QuantizedMeshTerrainData>|undefined
对该地形数据进行上采样以供后代图块使用。生成的实例将包含该实例中顶点的子集,必要时进行插值。 Upsamples this terrain data for use by a descendant tile. The resulting instance will contain a subset of the vertices in this instance, interpolated if necessary.
| 名称 Name | 类型 Type | 说明 Description |
|---|---|---|
tilingScheme |
TilingScheme | 该地形数据的切片方案。 The tiling scheme of this terrain data. |
thisX |
number | 切片方案中该切片的 X 坐标。 The X coordinate of this tile in the tiling scheme. |
thisY |
number | 切片方案中该切片的 Y 坐标。 The Y coordinate of this tile in the tiling scheme. |
thisLevel |
number | 该切片在切片方案中的级别。 The level of this tile in the tiling scheme. |
descendantX |
number | 我们正在对其进行上采样的后代切片的切片方案中的 X 坐标。 The X coordinate within the tiling scheme of the descendant tile for which we are upsampling. |
descendantY |
number | 我们要对其进行上采样的后代切片的切片方案中的 Y 坐标。 The Y coordinate within the tiling scheme of the descendant tile for which we are upsampling. |
descendantLevel |
number | 我们正在对其进行上采样的后代切片的切片方案中的级别。 The level within the tiling scheme of the descendant tile for which we are upsampling. |
返回: Returns:
对后代图块的上采样高度图地形数据的承诺,或者如果正在进行太多异步上采样操作并且请求已被推迟,则未定义。 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.
获取一个值,该值指示此地形数据是否是通过对较低分辨率地形数据进行上采样而创建的。如果该值为 false,则数据是从其他来源获取的,例如从远程服务器下载。对于从调用返回的实例,此方法应返回 true 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: Returns:
如果此实例是通过上采样创建的,则为 True;否则为假。 True if this instance was created by upsampling; otherwise, false.
