geotrellis.raster.mapalgebra.zonal.ZonalHistograms.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.zonal

import geotrellis.raster._
import geotrellis.raster.histogram._


/**
 * Given a raster, return a histogram summary of the cells within each zone.
 *
 * @note    ZonalHistogram does not currently support Double raster data.
 *          If you use a Raster with a Double CellType (FloatConstantNoDataCellType, DoubleConstantNoDataCellType)
 *          the data values will be rounded to integers.
 */
trait ZonalHistogram[@specialized (Int, Double) T <: AnyVal] {
  def apply(tile: Tile, zones: Tile): Map[Int, Histogram[T]]
}