Class DEM

constructor

• new DEM(
      elevs: number[],
      bottomLeft: EastNorth,
      ptWidth: number,
      ptHeight: number,
      xSpacing: number,
      ySpacing: number,
  ): DEM

  Create a new DEM.

  Parameters

  • elevs: number[]

    array of elevations in metres.

  • bottomLeft: EastNorth

    the bottom left coordinate of the DEM in Spherical Mercator.

  • ptWidth: number

    number of points within the DEM in the horizontal direction.

  • ptHeight: number

    number of points within the DEM in the vertical direction.

  • xSpacing: number

    spacing in Spherical Mercator units in the horizontal direction.

  • ySpacing: number

    spacing in Spherical Mercator units in the vertical direction.

  Returns DEM

elevs

getBottomLeft

• getBottomLeft(): EastNorth

  Return the bottom left coordinate.

  Returns EastNorth

getElevation

• getElevation(x: number, y: number): number

  Obtains the elevation in metres at a given x and y Spherical Mercator coordinate using bilinear interpolation.

  Parameters

  • x: number

    the Spherical Mercator x coordinate.

  • y: number

    the Spherical Mercator y coordinate.

  Returns number

  the elevation in metres

getNPoints

• getNPoints(): [number, number]

  Return the number of points in the x and y directions.

  Returns [number, number]

getSpacing

• getSpacing(): [number, number]

  Return the spacing in Spherical Mercator units in the x and y directions.

  Returns [number, number]

processData

• processData(
      fn: (
          elevs: number[],
          bottomLeft: EastNorth,
          ptWidth: number,
          ptHeight: number,
          xSpacing: number,
          ySpacing: number,
      ) => void,
  ): void

  Process the DEM data with a custom function. The function has access to all the key properties of the DEM.

  Parameters

  • fn: (
        elevs: number[],
        bottomLeft: EastNorth,
        ptWidth: number,
        ptHeight: number,
        xSpacing: number,
        ySpacing: number,
    ) => void

  Returns void