Add web tiled layer

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Display a tiled web layer.

Image of Add web tiled layer sample

Use case

Tiled map services are a set of pre-generated images (e.g., "tiles") arranged in folders for each row, column, and zoom level. As you navigate the map, map tiles are requested for the current extent. ArcGISTiledLayer and WMTSLayer are types of tiled map services used for specific data types. WebTiledLayer is useful for displaying other data sources that contain tiles arranged in a row/column/level directory structure, such as OpenStreetMap.

How to use the sample

Run the sample and a map will appear. As you navigate the map, map tiles will be fetched automatically and displayed on the map.

How it works

Web tiled services use a uniform addressing scheme with pre-rendered tiles. Image tiles are accessed via a URL template string, with parameters for subdomain, level, column, and row.

Subdomain is optional and allows the Maps SDK to balance requests among multiple servers for enhanced performance.
Level, row, and column select the tiles to load based on the visible extent of the map.

To display the web tiled layer, this sample:

Creates a WebTiledLayer from a URL.
Creates a new Basemap from the layer.
Updates the attribution on the layer. Note: this is a necessary step because web tiled services don't have associated service metadata.
Displays the basemap.

For more information about web tiled layers, see the following resources:

Relevant API

Basemap
WebTiledLayer

About the data

The basemap in this sample is provided by ArcGIS Living Atlas of the World. ArcGIS Living Atlas of the World provides tiled services with several unique styles.

Sample Code

AddWebTiledLayerView.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 AddWebTiledLayerView: View {
    /// A map with web tiled layer.
    @State private var map: Map = {
        // Build the web tiled layer from ArcGIS Living Atlas of the World tile service url.
        let webTiledLayer = WebTiledLayer(urlTemplate: .worldTileServiceStringURL)
        webTiledLayer.setAttribution(.attributionString)

        let basemap = Basemap(baseLayer: webTiledLayer)
        let map = Map(basemap: basemap)
        map.initialViewpoint = Viewpoint(
            center: Point(x: -1e6, y: 1e6),
            scale: 15e7
        )
        return map
    }()

    var body: some View {
        MapView(map: map)
    }
}

private extension String {
    /// The attribution string for the ArcGIS Living Atlas of the World.
    static let attributionString = """
        Map tiles by <a href="https://livingatlas.arcgis.com">ArcGIS Living Atlas of the World</a>, under <a href="https://www.esri.com/en-us/legal/terms/full-master-agreement">Esri Master License Agreement</a>. Data by Esri, Garmin, GEBCO, NOAA NGDC, and other contributors.
        """
    /// The web tile service url from ArcGIS Living Atlas of the World.
    static let worldTileServiceStringURL = "https://services.arcgisonline.com/ArcGIS/rest/services/Ocean/World_Ocean_Base/MapServer/tile/{level}/{row}/{col}.jpg"
}

#Preview {
    AddWebTiledLayerView()
}