Packages

object FlowDirection

Operation to compute a flow direction raster from an elevation raster

The directional encoding is from: Greenlee,D. D. 1987. "Tile and Vector Processing for Scanned Linework." Photogrammetric Engineering and Remote Sensing (ISSN 0099-1112),vol. 53,Oct. 1987,p. 1383-1387.

The direction of flow is towards the neighboring cell with the largest drop in elevation. If two or more cells have the same drop in elevation,their directional values are added together. The 8-bit encoding of the direction preserves the multi-directional property.

Sinks, cells which have no drop in elevation towards any neighbor, have no direction of flow.

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Value Members

  1. def apply(raster: Tile): Tile
  2. def flow(c: Int, r: Int, raster: Tile, neighbors: Map[Int, Double]): Int

    Determine flow direction of the cell at (c, r) in given raster

  3. def getNeighbors(c: Int, r: Int, raster: Tile): Map[Int, Double]

    Produces a map of available immediate neighbors and their drop in elevation from the provided cell

  4. def isSink(c: Int, r: Int, raster: Tile, neighbors: Map[Int, Double]): Boolean
  5. def isSink(c: Int, r: Int, raster: Tile): Boolean

    Determines whether or not the cell at (c, r) in given raster is a sink