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1.  final def !=(arg0: Any): Boolean

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2.  final def ##(): Int

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3.  final def ==(arg0: Any): Boolean

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4.  def apply(elevationTile: Tile, startCol: Int, startRow: Int, op: AggregationOperator = Or, scatter: Boolean = false): Tile

   Compute the viewshed of the tile using the R2 algorithm.

   Compute the viewshed of the tile using the R2 algorithm. Makes use of the compute method of this object.

   elevationTile

   Elevations in units of meters

   startCol

   The x position of the vantage point

   startRow

   The y position of the vantage point

   op

   The aggregation operator to use (e.g. Or)

   scatter

   Whether to allow light to move (one pixel) normal to the ray

5.  final def asInstanceOf[T0]: T0

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6.  def clone(): AnyRef

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7.  def compute(elevationTile: Tile, viewshedTile: MutableArrayTile, startCol: Int, startRow: Int, viewHeight: Double, from: From, rays: Array[Ray], tileCallback: TileCallback, resolution: Double, maxDistance: Double, curvature: Boolean, operator: AggregationOperator, altitude: Double = Double.NegativeInfinity, cameraDirection: Double = 0, cameraFOV: Double = -1.0, epsilon: Double = 1/math.Pi, scatter: Boolean = true): Tile

   Compute the viewshed of the elevatonTile using the R2 algorithm from [1].

   Compute the viewshed of the elevatonTile using the R2 algorithm from [1]. The numbers in the elevationTile are assumed to be elevations in units of meters. The results are written into the viewshedTile.

   1. Franklin, Wm Randolph, and Clark Ray. "Higher isn’t necessarily better: Visibility algorithms and experiments." Advances in GIS research: sixth international symposium on spatial data handling. Vol. 2. Taylor & Francis Edinburgh, 1994.

   elevationTile

   Elevations in units of meters

   viewshedTile

   The tile into which the viewshed will be written

   startCol

   The x position of the vantage point

   startRow

   The y position of the vantage point

   viewHeight

   The absolute height (above sea level) of the vantage point

   from

   The direction from which the rays are allowed to come

   rays

   Rays shining in from other tiles

   tileCallback

   A callback to communicate rays which have reached the periphery of the tile

   resolution

   The resolution of the elevationTile in units of meters/pixel

   maxDistance

   The maximum distance that any ray is allowed to travel

   curvature

   Whether to account for the Earth's curvature or not

   operator

   The aggregation operator to use

   altitude

   The absolute altitude (above sea level) to query; if -∞, use the terrain height

   cameraDirection

   The direction (in radians) of the camera

   cameraFOV

   The camera field of view, rays whose dot product with the camera direction are less than this are filtered out

   epsilon

   Any ray within this many radians of vertical (horizontal) will be considered vertical (horizontal)

   scatter

   Whether to allow light to move (one pixel) normal to the ray

8.  final def eq(arg0: AnyRef): Boolean

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9.  def equals(arg0: Any): Boolean

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10.  def finalize(): Unit

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11.  def generateEmptyViewshedTile(cols: Int, rows: Int, debug: Int = 0): MutableArrayTile

    Generate an empty viewshed tile.

    Generate an empty viewshed tile.

    cols

    The number of columns

    rows

    The number of rows

12.  final def getClass(): Class[_]

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13.  def hashCode(): Int

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14.  final def isInstanceOf[T0]: Boolean

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15.  final def ne(arg0: AnyRef): Boolean

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16.  def nop(b: Bundle): Unit
17.  final def notify(): Unit

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18.  final def notifyAll(): Unit

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19.  final def synchronized[T0](arg0: ⇒ T0): T0

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20.  def toString(): String

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21.  final def wait(): Unit

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22.  final def wait(arg0: Long, arg1: Int): Unit

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23.  final def wait(arg0: Long): Unit

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24.  object And extends AggregationOperator with Product with Serializable
25.  object Debug extends AggregationOperator with Product with Serializable
26.  object FromEast extends From with Product with Serializable
27.  object FromInside extends From with Product with Serializable
28.  object FromNorth extends From with Product with Serializable
29.  object FromSouth extends From with Product with Serializable
30.  object FromWest extends From with Product with Serializable
31.  object Or extends AggregationOperator with Product with Serializable
32.  object RayComparator extends Comparator[Ray]

    A Comparator for Rays which compares them by their theta angle.

    A Comparator for Rays which compares them by their theta angle. This is used in the binary search that is performed in thetaToAlpha.