Add elevation source from tile package

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Set the terrain surface with elevation described by a local tile package.

Screenshot of Add elevation source from tile package sample

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 loaded, the sample will show a scene with a terrain surface applied. Pan and zoom to explore the scene and observe how the terrain surface allows visualizing elevation differences.

How it works

  1. Create a Scene and add it to a SceneView.
  2. Create an ArcGISTiledElevationSource with the path to the local tile package.
  3. Add the source to the scene's base surface.

Relevant API

  • ArcGISTiledElevationSource
  • Surface

Offline data

This sample uses the Monterey Elevation tile package, using CompactV2 storage format (.tpkx). It is downloaded from ArcGIS Online automatically.

Additional information

The tile package must be a LERC (limited error raster compression) encoded TPK/TPKX. Details on the topic can be found in Share a tile package in the ArcGIS Pro documentation.

Tags

3D, elevation, LERC, surface, terrain, tile cache

Sample Code

AddElevationSourceFromTilePackageView.swift
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// Copyright 2024 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
//
//   https://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 ArcGIS
import SwiftUI

struct AddElevationSourceFromTilePackageView: View {
    /// A scene with elevation for Monterey, California.
    @State private var scene: ArcGIS.Scene = {
        let scene = Scene(basemapStyle: .arcGISImagery)

        // Creates the tiled elevation source using a URL.
        let rasterElevationSource = ArcGISTiledElevationSource(url: .montereyElevationTilePackage)

        // Creates a surface to add the elevation source to the scene.
        let surface = Surface()
        surface.addElevationSource(rasterElevationSource)
        scene.baseSurface = surface

        // Sets the scene's initial camera to showcase the elevation.
        let camera = Camera(
            latitude: 36.525,
            longitude: -121.8,
            altitude: 300,
            heading: 180,
            pitch: 80,
            roll: 0
        )
        let viewpoint = Viewpoint(latitude: .nan, longitude: .nan, scale: .nan, camera: camera)
        scene.initialViewpoint = viewpoint

        return scene
    }()

    var body: some View {
        // Displays the scene in a scene view.
        SceneView(scene: scene)
    }
}

private extension URL {
    /// The URL to the local tile package file with elevation data for Monterey, California.
    static var montereyElevationTilePackage: URL {
        Bundle.main.url(forResource: "MontereyElevation", withExtension: "tpkx")!
    }
}

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