Display nautical charts per the ENC specification.

Use case
The ENC specification describes how hydrographic data should be displayed digitally.
An ENC exchange set is a catalog of data files which can be loaded as cells. The cells contain information on how symbols should be displayed in relation to one another, so as to represent information such as depth and obstacles accurately.
How to use the sample
Run the sample and view the ENC data. Pan and zoom around the map. Take note of the high level of detail in the data and the smooth rendering of the layer.
How it works
- Specify the path to a local CATALOG.031 file to create an
EncExchangeSet. - After loading the exchange set, get the
EncDatasetobjects in the exchange set withdatasets(). - Create an
EncCellfor each dataset. Then create anEncLayerfor each cell. - Add the ENC layer to a map’s operational layers collection to display it.
Relevant API
- EncCell
- EncDataset
- EncExchangeSet
- EncLayer
Offline data
To set up the sample’s offline data, see the Use offline data in the samples section of the Qt Samples repository overview.
| Link | Local Location |
|---|---|
| Exchange Set | <userhome>/ArcGIS/Runtime/Data/ENC/ExchangeSetwithoutUpdates |
| Hydrography | <userhome>/ArcGIS/Runtime/Data/ENC/hydrography |
Tags
data, ENC, hydrographic, layers, maritime, nautical chart
Sample Code
// [WriteFile Name=AddEncExchangeSet, Category=Layers]// [Legal]// Copyright 2019 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
// sample headers#include "AddEncExchangeSet.h"
// ArcGIS Maps SDK headers#include "EncCell.h"#include "EncDataset.h"#include "EncEnvironmentSettings.h"#include "EncExchangeSet.h"#include "EncLayer.h"#include "Envelope.h"#include "Error.h"#include "GeometryEngine.h"#include "LayerListModel.h"#include "Map.h"#include "MapQuickView.h"#include "MapTypes.h"#include "Viewpoint.h"
// Qt headers#include <QFuture>#include <QStandardPaths>#include <QtCore/qglobal.h>
using namespace Esri::ArcGISRuntime;
// helper method to get cross platform data pathnamespace{ QString defaultDataPath() { QString dataPath;
#ifdef Q_OS_IOS dataPath = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation); #else dataPath = QStandardPaths::writableLocation(QStandardPaths::HomeLocation); #endif
return dataPath; }} // namespace
AddEncExchangeSet::AddEncExchangeSet(QObject* parent /* = nullptr */): QObject(parent), m_map(new Map(BasemapStyle::ArcGISOceans, this)){ // set resource path EncEnvironmentSettings::setResourcePath(defaultDataPath() + "/ArcGIS/Runtime/Data/ENC/hydrography");
// create ENC Exchange Set QStringList encPaths = { defaultDataPath() + "/ArcGIS/Runtime/Data/ENC/ExchangeSetwithoutUpdates/ENC_ROOT/CATALOG.031" }; m_encExchangeSet = new EncExchangeSet(encPaths, this);}
AddEncExchangeSet::~AddEncExchangeSet() = default;
void AddEncExchangeSet::init(){ // Register the map view for QML qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView"); qmlRegisterType<AddEncExchangeSet>("Esri.Samples", 1, 0, "AddEncExchangeSetSample");}
MapQuickView* AddEncExchangeSet::mapView() const{ return m_mapView;}
// Set the view (created in QML)void AddEncExchangeSet::setMapView(MapQuickView* mapView){ if (!mapView || mapView == m_mapView) return;
m_mapView = mapView; m_mapView->setMap(m_map);
// connect to doneLoading signal of EncExchangeSet connect(m_encExchangeSet, &EncExchangeSet::doneLoading, this, [this](const Error& e) { if (!e.isEmpty()) return;
// loop through datasets const auto datasets = m_encExchangeSet->datasets(); for (EncDataset* dataset : datasets) { // create an EncCell from each dataset EncCell* cell = new EncCell(dataset, this);
// create an EncLayer from each cell EncLayer* encLayer = new EncLayer(cell, this);
// connect to the doneLoading signal of the layer connect(encLayer, &EncLayer::doneLoading, this, [this, encLayer](const Error& e) { if (!e.isEmpty()) return;
m_extents << encLayer->fullExtent();
if (m_extents.length() != m_encExchangeSet->datasets().length()) return;
// combine the extents Envelope fullExtent = GeometryEngine::combineExtents(m_extents); m_mapView->setViewpointAsync(Viewpoint{fullExtent}); });
// add the layer to the map m_map->operationalLayers()->append(encLayer); } });
// load the EncExchangeSet m_encExchangeSet->load();
emit mapViewChanged();}// [WriteFile Name=AddEncExchangeSet, Category=Layers]// [Legal]// Copyright 2019 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]
#ifndef ADDENCEXCHANGESET_H#define ADDENCEXCHANGESET_H
// Qt headers#include <QObject>
namespace Esri::ArcGISRuntime{class Map;class MapQuickView;class EncExchangeSet;class Geometry;}
Q_MOC_INCLUDE("MapQuickView.h")
class AddEncExchangeSet : public QObject{ Q_OBJECT
Q_PROPERTY(Esri::ArcGISRuntime::MapQuickView* mapView READ mapView WRITE setMapView NOTIFY mapViewChanged)
public: explicit AddEncExchangeSet(QObject* parent = nullptr); ~AddEncExchangeSet();
static void init();
signals: void mapViewChanged();
private: Esri::ArcGISRuntime::MapQuickView* mapView() const; void setMapView(Esri::ArcGISRuntime::MapQuickView* mapView);
Esri::ArcGISRuntime::Map* m_map = nullptr; Esri::ArcGISRuntime::MapQuickView* m_mapView = nullptr; Esri::ArcGISRuntime::EncExchangeSet* m_encExchangeSet = nullptr; QList<Esri::ArcGISRuntime::Geometry> m_extents;};
#endif // ADDENCEXCHANGESET_H// [WriteFile Name=AddEncExchangeSet, Category=Layers]// [Legal]// Copyright 2019 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]
import QtQuickimport QtQuick.Controlsimport Esri.Samples
Item {
// add a mapView component MapView { id: view anchors.fill: parent
Component.onCompleted: { // Set the focus on MapView to initially enable keyboard navigation forceActiveFocus(); } }
// Declare the C++ instance which creates the map etc. and supply the view AddEncExchangeSetSample { id: model mapView: view }}// [Legal]// Copyright 2019 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]
// sample headers#include "AddEncExchangeSet.h"
// ArcGIS Maps SDK headers#include "ArcGISRuntimeEnvironment.h"
// Qt headers#include <QDir>#include <QGuiApplication>#include <QQmlApplicationEngine>
// Platform specific headers#ifdef Q_OS_WIN#include <Windows.h>#endif
#define STRINGIZE(x) #x#define QUOTE(x) STRINGIZE(x)
int main(int argc, char *argv[]){ Esri::ArcGISRuntime::ArcGISRuntimeEnvironment::setUseLegacyAuthentication(false); QGuiApplication app(argc, argv); app.setApplicationName(QString("AddEncExchangeSet"));
// Use of ArcGIS location services, such as basemap styles, geocoding, and routing services, // requires an access token. For more information see // https://links.esri.com/arcgis-runtime-security-auth.
// The following methods grant an access token:
// 1. User authentication: Grants a temporary access token associated with a user's ArcGIS account. // To generate a token, a user logs in to the app with an ArcGIS account that is part of an // organization in ArcGIS Online or ArcGIS Enterprise.
// 2. API key authentication: Get a long-lived access token that gives your application access to // ArcGIS location services. Go to the tutorial at https://links.esri.com/create-an-api-key. // Copy the API Key access token.
const QString accessToken = QString("");
if (accessToken.isEmpty()) { qWarning() << "Use of ArcGIS location services, such as the basemap styles service, requires" << "you to authenticate with an ArcGIS account or set the API Key property."; } else { Esri::ArcGISRuntime::ArcGISRuntimeEnvironment::setApiKey(accessToken); }
// Initialize the sample AddEncExchangeSet::init();
QString arcGISRuntimeImportPath = QUOTE(ARCGIS_RUNTIME_IMPORT_PATH);
#if defined(LINUX_PLATFORM_REPLACEMENT) // on some linux platforms the string 'linux' is replaced with 1 // fix the replacement paths which were created QString replaceString = QUOTE(LINUX_PLATFORM_REPLACEMENT); arcGISRuntimeImportPath = arcGISRuntimeImportPath.replace(replaceString, "linux", Qt::CaseSensitive);#endif
// Initialize application view QQmlApplicationEngine engine; // Add the import Path engine.addImportPath(QDir(QCoreApplication::applicationDirPath()).filePath("qml")); // Add the Runtime and Extras path engine.addImportPath(arcGISRuntimeImportPath);
// Set the source engine.load(QUrl("qrc:/Samples/Layers/AddEncExchangeSet/main.qml"));
return app.exec();}// Copyright 2019 ESRI//// All rights reserved under the copyright laws of the United States// and applicable international laws, treaties, and conventions.//// You may freely redistribute and use this sample code, with or// without modification, provided you include the original copyright// notice and use restrictions.//// See the Sample code usage restrictions document for further information.//
import QtQuick.Controlsimport Esri.Samples
ApplicationWindow { visible: true width: 800 height: 600
AddEncExchangeSet { anchors.fill: parent }}