Create terrain surface from a local raster

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// [WriteFile Name=CreateTerrainSurfaceFromLocalRaster, Category=Scenes]
// [Legal]
// Copyright 2019 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
import Esri.ArcGISRuntime
import Esri.ArcGISExtras

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

    readonly property string montereyRasterElevationPath: {
        Qt.platform.os === "ios" ?
                    System.writableLocation(System.StandardPathsDocumentsLocation) + "/ArcGIS/Runtime/Data/raster/MontereyElevation.dt2" :
                    System.writableLocation(System.StandardPathsHomeLocation) + "/ArcGIS/Runtime/Data/raster/MontereyElevation.dt2"
    }

    SceneView {
        id: sceneView
        anchors.fill: parent

        Scene {
            id: scene
            Basemap {
                initStyle: Enums.BasemapStyleArcGISImageryStandard
            }

            Surface {
                RasterElevationSource{
                    // RasterElevationSource takes a list of raster files. Here we provide a list cotaining just a single file.
                    fileUrls: [montereyRasterElevationPath]
                    // Hook up success/error reporting for the Elevation Source load
                    onLoadStatusChanged: reportLoadStatus(loadStatus, loadError)
                }
            }
        }

        Component.onCompleted: {
            // Set the focus on SceneView to initially enable keyboard navigation
            forceActiveFocus();

            // Once the scene view has loaded, apply the camera.
            setViewpointCameraAndWait(camera);
        }
    }

    function reportLoadStatus(loadStatus, loadError){
        if(loadStatus === Enums.LoadStatusLoaded){
            console.info("Loaded raster elevation source succesfully");
        }
        else if(loadStatus === Enums.LoadStatusFailedToLoad){
            console.warn("Error loading elevation source : ", loadError.message, loadError.additionalMessage);
        }
    }

    // Create the camera to be used as the scene view's viewpoint, looking at Monterey, California..
    Camera {
        id: camera
        location: Point {
            x: -121.80 // Longitude
            y: 36.51 // Latitude
            z: 300.0 // Altiude
            spatialReference: SpatialReference { wkid: 4326 }
        }
        heading: 10.0
        pitch: 70.0
        roll: 0.0
    }
}