Raster layer (service)

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Create a raster layer from a raster image service.

screenshot

Use case

Accessing a raster image from an online service can be useful for analysing 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

  1. Create an ImageServiceRaster using the service's URL.
  2. Create a RasterLayer from the image service raster.
  3. Add the raster layer the the map.

Relevant API

  • ImageServiceRaster
  • RasterLayer

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.

Tags

image service, raster

Sample Code

RasterLayerService.cppRasterLayerService.cppRasterLayerService.hRasterLayerService.qml
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// [WriteFile Name=RasterLayerService, Category=Layers]
// [Legal]
// 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.
// [Legal]

#ifdef PCH_BUILD
#include "pch.hpp"
#endif // PCH_BUILD

#include "RasterLayerService.h"

#include "Map.h"
#include "MapQuickView.h"
#include "RasterLayer.h"
#include "Basemap.h"
#include "ArcGISTiledLayer.h"
#include "ImageServiceRaster.h"

using namespace Esri::ArcGISRuntime;

RasterLayerService::RasterLayerService(QQuickItem* parent /* = nullptr */):
  QQuickItem(parent)
{
}

RasterLayerService::~RasterLayerService() = default;

void RasterLayerService::init()
{
  // Register the map view for QML
  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
  qmlRegisterType<RasterLayerService>("Esri.Samples", 1, 0, "RasterLayerServiceSample");
}

void RasterLayerService::componentComplete()
{
  QQuickItem::componentComplete();

  // find QML MapView component
  m_mapView = findChild<MapQuickView*>("mapView");
  m_mapView->setWrapAroundMode(WrapAroundMode::Disabled);

  // create a new tiled layer to add a basemap
  ArcGISTiledLayer* tiledLayer = new ArcGISTiledLayer(
        QUrl(QStringLiteral("https://services.arcgisonline.com/arcgis/rest/services/Canvas/World_Dark_Gray_Base/MapServer")), this);
  m_map = new Map(new Basemap(tiledLayer, this));
  m_mapView->setMap(m_map);

  //! [ImageServiceRaster Create a new image service raster]
  // create an image service raster
  ImageServiceRaster* imageServiceRaster = new ImageServiceRaster(
        QUrl(QStringLiteral("https://gis.ngdc.noaa.gov/arcgis/rest/services/bag_hillshades_subsets/ImageServer")), this);
  // zoom to the center of the raster once it's loaded
  connect(imageServiceRaster, &ImageServiceRaster::doneLoading, this, [this]()
  {
    constexpr double scale = 200000.;
    Viewpoint vpCenter = Viewpoint(Point(-13643095.660131, 4550009.846004, SpatialReference::webMercator()), scale);
    m_mapView->setViewpoint(vpCenter);
  });

  // create a raster layer using the image service raster
  m_rasterLayer = new RasterLayer(imageServiceRaster, this);
  // add the raster layer to the map's operational layers
  m_map->operationalLayers()->append(m_rasterLayer);
  //! [ImageServiceRaster Create a new image service raster]
}

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