Create and use a raster layer made from a local raster file.
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
- Create an
AGSRaster
from a raster file. - Create an
AGSRasterLayer
from the raster. - 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
//
// 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))
}
}
}
}
}