Raster layer (file)

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Sample viewer app

Create and use a raster layer made from a local raster file.

Raster layer (file) sample

Use case

Rasters can be digital aerial photographs, imagery from satellites, digital pictures, or even scanned maps. An end-user will frequently need to import raster files acquired through various data-collection methods into their map to view and analyze the data.

How to use the sample

When the sample starts, a raster will be loaded from a file and displayed in the map view.

How it works

  1. Create an AGSRaster from a raster file.
  2. Create an AGSRasterLayer from the raster.
  3. Add it to the map's operationalLayers array.

Relevant API

  • AGSRaster
  • AGSRasterLayer

Additional information

See the topic What is raster data? in the ArcMap documentation for more information about raster images.

Tags

data, image, import, layer, raster, visualization

Sample Code

RasterLayerViewController.swift
                                                           
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//
// 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 RasterLayerViewController: UIViewController {
    @IBOutlet private weak var mapView: AGSMapView!

    private var map: AGSMap!

    private var rasterLayer: AGSRasterLayer!

    override func viewDidLoad() {
        super.viewDidLoad()

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

        // create raster
        let raster = AGSRaster(name: "Shasta", extension: "tif")

        // create raster layer using raster
        self.rasterLayer = AGSRasterLayer(raster: raster)

        // initialize map with imagery basemap
        self.map = AGSMap(basemapStyle: .arcGISImageryStandard)

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

        // add the raster layer to the operational layers of the map
        self.mapView.map?.operationalLayers.add(rasterLayer!)

        // set map view's viewpoint to the raster layer's full extent
        self.rasterLayer.load { [weak self] (error) in
            if let error = error {
               self?.presentAlert(error: error)
            } else {
                if let center = self?.rasterLayer.fullExtent?.center {
                    self?.mapView.setViewpoint(AGSViewpoint(center: center, scale: 80000))
                }
            }
        }
    }
}

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