Raster layer (GeoPackage)

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Sample viewer app

Display a raster contained in a GeoPackage.

screenshot

Use case

GeoPackages are designed to simplify file management and transfer. They can store raster files (as well as other types of data). An end-user wishing to transfer rasters from ArcGIS Pro or between runtime apps, might need to import raster files from GeoPackages 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 GeoPackage and displayed in the map view.

How it works

  1. Create and load a GeoPackage, specifying the path to the local .gpkg file.
  2. When it is done loading, get the GeoPackageRasters from the geopackage.
  3. Construct a RasterLayer with the geopackage raster you want to use.
  4. Add the raster layer to the map.

Relevant API

  • GeoPackage
  • GeoPackageRaster
  • RasterLayer

Offline Data

Read more about how to set up the sample's offline data here.

Link Local Location
Aurora, Colorado GeoPackage <userhome>/ArcGIS/Runtime/Data/gpkg/AuroraCO.gpkg

About the data

The Aurora Colorado GeoPackage holds datasets that cover Aurora, Colorado. The raster that is opened and displayed shows airport noise levels.

Tags

container, data, image, import, layer, OGC, package, raster, visualization

Sample Code

RasterLayerGeoPackage.cppRasterLayerGeoPackage.cppRasterLayerGeoPackage.hRasterLayerGeoPackage.qml
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// [WriteFile Name=RasterLayerGeoPackage, 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 "RasterLayerGeoPackage.h"

#include "Map.h"
#include "MapQuickView.h"
#include "GeoPackage.h"
#include "GeoPackageRaster.h"
#include "RasterLayer.h"
#include "Point.h"
#include "Viewpoint.h"

#include <QUrl>
#include <QDir>
#include <QtCore/qglobal.h>

#ifdef Q_OS_IOS
#include <QStandardPaths>
#endif // Q_OS_IOS

using namespace Esri::ArcGISRuntime;

// helper method to get cross platform data path
namespace
{
  QString defaultDataPath()
  {
    QString dataPath;

  #ifdef Q_OS_ANDROID
    dataPath = "/sdcard";
  #elif defined Q_OS_IOS
    dataPath = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
  #else
    dataPath = QDir::homePath();
  #endif

    return dataPath;
  }
} // namespace

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

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

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

  // find QML MapView component
  m_mapView = findChild<MapQuickView*>("mapView");

  // Create a map using the light gray basemap
  m_map = new Map(BasemapStyle::ArcGISLightGray, this);

  // Set an initial viewpoint
  const Point pt(-104.8319, 39.7294, SpatialReference(4326));
  const Viewpoint vp(pt, 200000);
  m_map->setInitialViewpoint(vp);

  // Create the GeoPackage
  const QString dataPath = defaultDataPath() + "/ArcGIS/Runtime/Data/gpkg/";
  GeoPackage* gpkg = new GeoPackage(dataPath + "AuroraCO.gpkg", this);

  // Connect to GeoPackage::doneLoading
  connect(gpkg, &GeoPackage::doneLoading, this, [this, gpkg](const Error e)
  {
    if (!e.isEmpty())
      return;

    if (!(gpkg->geoPackageRasters().size() > 0))
      return;

    GeoPackageRaster* gpkgRaster = gpkg->geoPackageRasters().at(0);
    RasterLayer* rasterLayer = new RasterLayer(gpkgRaster, this);
    m_map->operationalLayers()->append(rasterLayer);
  });

  // Connect to Map::doneLoading
  connect(m_map, &Map::doneLoading, this, [gpkg](const Error e)
  {
    if (!e.isEmpty())
      return;

    // load the GeoPackage
    gpkg->load();
  });

  // Set map to map view
  m_mapView->setMap(m_map);
}

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