/
Max.scala
64 lines (59 loc) · 2.17 KB
/
Max.scala
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/*
* Copyright 2016 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.focal
import geotrellis.raster._
/**
* Computes the maximum value of a neighborhood for a given raster.
*
* @note Maximum does not currently support Double raster data.
* If you use a Tile with a Double CellType (FloatConstantNoDataCellType, DoubleConstantNoDataCellType)
* the data values will be rounded to integers.
*/
object Max {
def calculation(tile: Tile, n: Neighborhood, bounds: Option[GridBounds[Int]] = None, target: TargetCell = TargetCell.All): FocalCalculation[Tile] = {
if (tile.cellType.isFloatingPoint) {
new CursorCalculation[Tile](tile, n, bounds, target)
with ArrayTileResult
{
def calc(r: Tile, cursor: Cursor) = {
var m = Double.NaN
cursor.allCells.foreach { (x, y) =>
val v = r.getDouble(x, y)
if (isData(v) && (v > m || isNoData(m))) {
m = v
}
}
resultTile.setDouble(cursor.col, cursor.row, m)
}
}
} else {
new CursorCalculation[Tile](tile, n, bounds, target)
with ArrayTileResult
{
def calc(r: Tile, cursor: Cursor) = {
var m = Int.MinValue
cursor.allCells.foreach { (x, y) =>
val v = r.get(x, y)
if(v > m) { m = v }
}
resultTile.set(cursor.col, cursor.row, m)
}
}
}
}
def apply(tile: Tile, n: Neighborhood, bounds: Option[GridBounds[Int]] = None, target: TargetCell = TargetCell.All): Tile =
calculation(tile, n, bounds, target).execute()
}