geotrellis.raster.mapalgebra.local.Atan.scala Maven / Gradle / Ivy

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GeoTrellis is an open source geographic data processing engine for high performance applications.

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/*
 * Copyright (c) 2014 Azavea.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package geotrellis.raster.mapalgebra.local

import geotrellis.raster._

/**
 * Operation to get the Arc Tangent of values.
 * @info A double raster is always returned.
 */
object Atan extends Serializable {
  /** Takes the Arc Tangent of each raster cell value. */
  def apply(r: Tile): Tile = 
    (if(r.cellType.isFloatingPoint) r
     else r.convert(DoubleConstantNoDataCellType))
     .mapDouble(z => math.atan(z))
}