Raster function (file)

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Apply a raster function to a local raster file and display the output with a raster layer.

screenshot

Use case

Raster functions allow processing operations that can be applied to one or more rasters on the fly. A land survey agency may apply hillshade and aspect functions to rasters with elevation data in order to better determine the topography of a landscape and to make further planning decisions.

How to use the sample

Load the sample to see a raster function applied to a raster.

How it works

  1. Create a RasterFunction using the path to a local raster function JSON file.
  2. Set the raster function arguments as required by the function used.
  3. Use the raster function to create a new Raster.
  4. Set the raster to a RasterLayer and display it in the Map.

Relevant API

  • Raster
  • RasterFunction
  • RasterLayer

Offline Data

Read more about how to set up the sample's offline data here.

Link Local Location
Shasta.tif raster <userhome>/ArcGIS/Runtime/Data/raster/Shasta_Elevation.tif
color.json raster function <userhome>/ArcGIS/Runtime/Data/raster/color.json

About the data

The raster function in the provided JSON file blends a color image with a greyscale image (in this case, a raster image containing elevation data), to add a hillshade effect to the input raster.

Additional information

Learn more about raster functions in the ArcGIS Pro documentation.

Tags

analysis, function, image, layer, processing, raster, raster function, transformation

Sample Code

RasterFunctionFile.qmlRasterFunctionFile.cppRasterFunctionFile.h
                                                                        
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// [WriteFile Name=RasterFunctionFile, Category=Layers]
// [Legal]
// Copyright 2017 Esri.

// 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.
// [Legal]

import QtQuick 2.6
import QtQuick.Controls 2.2
import Esri.Samples 1.0

RasterFunctionFileSample {
    id: rootRectangle
    clip: true
    width: 800
    height: 600

    // add a mapView component
    MapView {
        anchors.fill: parent
        objectName: "mapView"
    }

    // Create a button to apply the raster function
    Rectangle {
        id: button
        enabled: ready
        property bool pressed: false

        anchors {
            right: parent.right
            bottom: parent.bottom
            rightMargin: 20
            bottomMargin: 40
        }

        width: 45
        height: width
        color: pressed ? "#959595" : "#D6D6D6"
        radius: 100
        border {
            color: "#585858"
            width: 1
        }

        Image {
            anchors {
                centerIn: parent
                verticalCenterOffset: -3
            }
            width: 26
            height: width
            source: "qrc:/Samples/Layers/RasterFunctionFile/color.png"
        }

        MouseArea {
            anchors.fill: parent
            onPressed: button.pressed = true
            onReleased: button.pressed = false
            onClicked: applyRasterFunction()
        }
    }
}

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