Set the terrain surface with elevation described by a raster file.
Use case
In a scene view, the terrain surface is what the basemap, operational layers, and graphics are draped onto. For example, when viewing a scene in a mountainous region, applying a terrain surface to the scene will help in recognizing the slopes, valleys, and elevated areas.
How to use the sample
When opened, this sample displays a scene that was rendered using a local raster file. Pan and zoom to explore the scene and observe how the terrain surface allows visualizing elevation differences.
How it works
Create an AGSScene and add it to a AGSSceneView.
Create a AGSRasterElevationSource with an array of raster file URLs.
Add this source to the scene's base surface.
Relevant API
AGSRasterElevationSource
AGSSurface
Offline data
This sample uses the MontereyElevation raster. It is downloaded from ArcGIS Online automatically.
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// 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.import UIKit
import ArcGIS
classCreateTerrainSurfaceFromLocalRasterViewController: UIViewController{
@IBOutletweakvar sceneView: AGSSceneView! {
didSet {
// Initialize a scene. sceneView.scene = makeScene()
// Set scene's viewpoint.let camera =AGSCamera(latitude: 36.525, longitude: -121.80, altitude: 300.0, heading: 180, pitch: 80, roll: 0)
sceneView.setViewpointCamera(camera)
}
}
funcmakeScene() -> AGSScene {
let scene =AGSScene(basemapStyle: .arcGISImagery)
let surface =AGSSurface()
// Create raster elevation source.let rasterURL =Bundle.main.url(forResource: "MontereyElevation", withExtension: "dt2")!let rasterElevationSource =AGSRasterElevationSource(fileURLs: [rasterURL])
// Add a raster source to the surface. surface.elevationSources.append(rasterElevationSource)
scene.baseSurface = surface
return scene
}
overridefuncviewDidLoad() {
super.viewDidLoad()
// Add the source code button item to the right of navigation bar. (self.navigationItem.rightBarButtonItem as!SourceCodeBarButtonItem).filenames = ["CreateTerrainSurfaceFromLocalRasterViewController"]
}
}
