Raster layer (service)

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Sample viewer app

Create a raster layer from a raster image service.

Raster layer (service) sample

Use case

Accessing a raster image from an online service can be useful for analyzing the most up-to-date data available for an area. For example, retrieving recent results of bathymetry surveys within a shipping channel monitored for its sediment build-up would allow planners to assess dredging needs.

How to use the sample

Simply launch the sample to see a raster from an image service being used on a map.

How it works

Create an AGSImageServiceRaster using the service's URL.
Create an AGSRasterLayer from the image service raster.
Add the raster layer the the map.

Relevant API

AGSmageServiceRaster
AGSRasterLayer

About the data

This sample uses a NOAA raster image service. The service computes a hillshade image from the depth (in meters) of U.S. coastal waters.

Sample Code

RasterLayerUsingServiceViewController.swift
Use dark colors for code blocksCopy
//
// Copyright 2017 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

class RasterLayerUsingServiceViewController: UIViewController {
    @IBOutlet weak var mapView: AGSMapView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // initialize a map with dark canvas vector basemap
        let map = AGSMap(basemapStyle: .arcGISDarkGrayBase)

        // assign the map to the map view
        mapView.map = map

        // set the viewpoint to the Golden Gate of the San Francisco Bay
        let center = AGSPoint(x: -13637000, y: 4550000, spatialReference: .webMercator())
        mapView.setViewpointCenter(center, scale: 100000)

        /// The URL of an image service containing a bathymetric attributed grid.
        let imageServiceURL = URL(string: "https://gis.ngdc.noaa.gov/arcgis/rest/services/bag_hillshades_subsets/ImageServer")!
        // create an image service raster from an online raster service
        let imageServiceRaster = AGSImageServiceRaster(url: imageServiceURL)
        // create a raster layer
        let rasterLayer = AGSRasterLayer(raster: imageServiceRaster)

        // add raster layer as an operational layer to the map
        map.operationalLayers.add(rasterLayer)

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