View point cloud data offline

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Sample viewer app

Display local 3D point cloud data.

View point cloud data offline sample

Use case

Point clouds are often used to visualize massive sets of sensor data such as LiDAR. The point locations indicate where the sensor data was measured spatially, and the color or size of the points indicate the measured/derived value of the sensor reading. In the case of LiDAR, the color of the visualized point could be the color of the reflected light, so that the point cloud forms a true color 3D image of the area.

Point clouds can be loaded offline from scene layer packages (.slpk).

How to use the sample

The sample displays a point cloud layer loaded and draped on top of a scene. Pan and zoom to explore the scene and see the detail of the point cloud layer.

How it works

  1. Create an instance of AGSPointCloudLayer with the URL to a local .slpk file containing a point cloud layer.
  2. Add the layer to a scene's operational layers collection.

Relevant API

  • AGSPointCloudLayer

About the data

This point cloud data comes from Balboa Park in San Diego, California. Created and provided by USGS.

Tags

3D, lidar, point cloud

Sample Code

ViewPointCloudDataOfflineViewController.swift
                                                                             
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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

/// A view controller that manages the interface of the View Point Cloud Data
/// Offline sample.
class ViewPointCloudDataOfflineViewController: UIViewController {
    /// The scene view managed by the view controller.
    @IBOutlet var sceneView: AGSSceneView! {
        didSet {
            sceneView.scene = makeScene()
        }
    }

    /// Creates a scene with a point cloud layer.
    ///
    /// - Returns: A new `AGSScene` object.
    func makeScene() -> AGSScene {
        let scene = AGSScene(basemapType: .imagery)

        // Create the elevation source.
        let elevationServiceURL = URL(string: "https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer")!
        let elevationSource = AGSArcGISTiledElevationSource(url: elevationServiceURL)

        // Create the surface and add it to the scene.
        let surface = AGSSurface()
        surface.elevationSources = [elevationSource]
        scene.baseSurface = surface

        // Create the point cloud layer and add it to the scene.
        if let sceneLayerPackageURL = Bundle.main.url(forResource: "sandiego-north-balboa-pointcloud", withExtension: "slpk") {
            let pointCloudLayer = AGSPointCloudLayer(url: sceneLayerPackageURL)
            pointCloudLayer.load { [weak self, unowned layer = pointCloudLayer] _ in
                self?.pointCloudLayerDidLoad(layer)
            }
            scene.operationalLayers.add(pointCloudLayer)
        }

        return scene
    }

    /// Called in response to the point cloud layer load operation completing.
    ///
    /// - Parameter layer: The point cloud layer that finished loading.
    func pointCloudLayerDidLoad(_ layer: AGSPointCloudLayer) {
        if let error = layer.loadError {
            presentAlert(error: error)
        } else if let extent = layer.fullExtent {
            let viewpoint = AGSViewpoint(targetExtent: extent)
            sceneView.setViewpoint(viewpoint)
        }
    }

    // MARK: UIViewController

    override func viewDidLoad() {
        super.viewDidLoad()

        // add the source code button item to the right of navigation bar
        (self.navigationItem.rightBarButtonItem as! SourceCodeBarButtonItem).filenames = ["ViewPointCloudDataOfflineViewController"]
    }
}

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