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• 0.9.2
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• Mask.scala

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geotrellis.raster.op.local.Mask.scala Maven / Gradle / Ivy

package geotrellis.raster.op.local

import geotrellis._

object Mask extends Serializable {  
  /**
   * Generate a raster with the values from the first raster, but only include
   * cells in which the corresponding cell in the second raster *are not* set to the 
   * "readMask" value. 
   *
   * For example, if *all* cells in the second raster are set to the readMask value,
   * the output raster will be empty -- all values set to NODATA.
   */
  def apply(r1:Op[Raster], r2:Op[Raster], readMask:Op[Int], writeMask:Op[Int]) =
    (r1,r2,readMask,writeMask).map { (r1,r2,readMask,writeMask) =>
      r1.dualCombine(r2)((z1,z2) =>         
        if (z2 == readMask) writeMask else z1
      )((z1,z2) => 
        if (d2i(z2) == readMask) i2d(writeMask) else z1
      )
    }.withName("Mask")
}