Offline geocode
Geocode addresses to locations and reverse geocode locations to addresses offline.
Use case
You can use an address locator file to geocode addresses and locations. For example, you could provide offline geocoding capabilities to field workers repairing critical infrastructure in a disaster when network availability is limited.
How to use the sample
Type the address in the Search menu option or select from the list to Geocode
the address and view the result on the map. Tap the location you want to reverse geocode. Select the pin to highlight the PictureMarkerSymbol
(i.e. single tap on the pin) and then tap-hold and drag on the map to get real-time geocoding.
How it works
- Use the path of a .loc file to create a
LocatorTask
object. - Set up
GeocodeParameters
and callgeocode
to get geocode results.
Relevant API
- GeocodeParameters
- GeocodeResult
- LocatorTask
- ReverseGeocodeParameters
Offline Data
Read more about how to set up the sample's offline data here.
Link | Local Location |
---|---|
SanDiego tpkx File | <userhome> /ArcGIS/Runtime/Data/tpkx/streetmap_SD.tpkx |
SanDiego loc Files | <userhome> /ArcGIS/Runtime/Data/Locators/SanDiegoStreetAddressLocator/SanDiego_StreetAddress.loc |
Tags
geocode, geocoder, locator, offline, package, query, search
Sample Code
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// [WriteFile Name=OfflineGeocode, Category=Search]
// [Legal]
// Copyright 2016 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 "OfflineGeocode.h"
#include "Map.h"
#include "Point.h"
#include "Graphic.h"
#include "CalloutData.h"
#include "LocatorTask.h"
#include "MapQuickView.h"
#include "GeocodeResult.h"
#include "GraphicsOverlay.h"
#include "SuggestListModel.h"
#include "ArcGISTiledLayer.h"
#include "GeocodeParameters.h"
#include "PictureMarkerSymbol.h"
#include "IdentifyGraphicsOverlayResult.h"
#include "MapViewTypes.h"
#include "TaskWatcher.h"
#include "Error.h"
#include "GraphicsOverlayListModel.h"
#include "GraphicListModel.h"
#include "LayerListModel.h"
#include "TileCache.h"
#include "Basemap.h"
#include "SpatialReference.h"
#include "Viewpoint.h"
#include <QScopedPointer>
#include <QtCore/qglobal.h>
#include <memory>
#include <QUuid>
#include <QStandardPaths>
using namespace Esri::ArcGISRuntime;
// helper method to get cross platform data path
namespace
{
QString defaultDataPath()
{
QString dataPath;
#ifdef Q_OS_IOS
dataPath = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
#else
dataPath = QStandardPaths::writableLocation(QStandardPaths::HomeLocation);
#endif
return dataPath;
}
} // namespace
using namespace Esri::ArcGISRuntime;
OfflineGeocode::OfflineGeocode(QQuickItem* parent):
QQuickItem(parent),
m_dataPath(defaultDataPath() + "/ArcGIS/Runtime/Data/")
{
}
OfflineGeocode::~OfflineGeocode() = default;
void OfflineGeocode::init()
{
qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
qmlRegisterType<OfflineGeocode>("Esri.Samples", 1, 0, "OfflineGeocodeSample");
qmlRegisterUncreatableType<CalloutData>("Esri.Samples", 1, 0, "CalloutData", "CalloutData is an uncreatable type");
qmlRegisterUncreatableType<SuggestListModel>("Esri.Samples", 1, 0, "SuggestListModel", "SuggestionListModel is an uncreatable type");
}
void OfflineGeocode::componentComplete()
{
QQuickItem::componentComplete();
// find QML MapView component
m_mapView = findChild<MapQuickView*>("mapView");
m_mapView->setWrapAroundMode(WrapAroundMode::Disabled);
// create a tiled layer using a local .tpkx file
TileCache* tileCache = new TileCache(m_dataPath + "tpkx/streetmap_SD.tpkx", this);
connect(tileCache, &TileCache::errorOccurred, this, &OfflineGeocode::logError);
m_tiledLayer = new ArcGISTiledLayer(tileCache, this);
// create basemap and add tiled layer
Basemap* basemap = new Basemap(this);
basemap->baseLayers()->append(m_tiledLayer);
// create map using basemap
m_map = new Map(basemap, this);
m_map->setInitialViewpoint(Viewpoint(Point(-13042254.715252, 3857970.236806, SpatialReference(3857)), 2e4));
// Set map to map view
m_mapView->setMap(m_map);
// create locator task
//! [OfflineGeocode create LocatorTask]
m_locatorTask = new LocatorTask(m_dataPath + "Locators/SanDiegoStreetAddressLocator/SanDiego_StreetAddress.loc", this);
//! [OfflineGeocode create LocatorTask]
// set the suggestions Q_PROPERTY
m_suggestListModel = m_locatorTask->suggestions();
emit suggestionsChanged();
// set geocode parameters
m_geocodeParameters.setMinScore(75);
m_geocodeParameters.setMaxResults(1);
m_reverseGeocodeParameters.setMaxResults(1);
// create graphics overlay and add pin graphic
m_graphicsOverlay = new GraphicsOverlay(this);
PictureMarkerSymbol* pinSymbol = new PictureMarkerSymbol(QUrl("qrc:/Samples/Search/OfflineGeocode/red_pin.png"), this);
pinSymbol->setHeight(36);
pinSymbol->setWidth(19);
pinSymbol->setOffsetY(pinSymbol->height() / 2);
m_pinGraphic = new Graphic(Point(-13042254.715252, 3857970.236806, SpatialReference(3857)), pinSymbol, this);
m_pinGraphic->setVisible(false);
m_graphicsOverlay->graphics()->append(m_pinGraphic);
m_mapView->graphicsOverlays()->append(m_graphicsOverlay);
// initialize callout
m_mapView->calloutData()->setVisible(false);
m_mapView->calloutData()->setTitle("Address");
m_calloutData = m_mapView->calloutData();
connectSignals();
}
void OfflineGeocode::geocodeWithText(const QString& address)
{
m_locatorTask->geocodeWithParameters(address, m_geocodeParameters);
}
void OfflineGeocode::geocodeWithSuggestion(int index)
{
m_locatorTask->geocodeWithSuggestResultAndParameters(m_suggestListModel->suggestResults().at(index), m_geocodeParameters);
}
void OfflineGeocode::setSuggestionsText(const QString& searchText)
{
m_suggestListModel->setSearchText(searchText);
}
void OfflineGeocode::logError(const Error& error)
{
setErrorMessage( QString("%1: %2").arg(error.message(), error.additionalMessage()));
}
SuggestListModel* OfflineGeocode::suggestions() const
{
return m_suggestListModel;
}
bool OfflineGeocode::geocodeInProgress() const
{
return m_geocodeInProgress;
}
bool OfflineGeocode::noResults() const
{
return m_noResults;
}
bool OfflineGeocode::suggestInProgress() const
{
return m_suggestInProgress;
}
void OfflineGeocode::connectSignals()
{
connect(m_map, &Map::errorOccurred, this, &OfflineGeocode::logError);
connect(m_mapView, &MapQuickView::errorOccurred, this, &OfflineGeocode::logError);
connect(m_mapView, &MapQuickView::mouseClicked, this, [this](QMouseEvent& mouseEvent)
{
m_clickedPoint = m_mapView->screenToLocation(mouseEvent.position().x(), mouseEvent.position().y());
m_mapView->identifyGraphicsOverlay(m_graphicsOverlay, mouseEvent.position().x(), mouseEvent.position().y(), 5, false, 1);
});
connect(m_mapView, &MapQuickView::mousePressedAndHeld, this, [this](QMouseEvent& mouseEvent)
{
m_isPressAndHold = true;
m_isReverseGeocode = true;
// reverse geocode
m_locatorTask->reverseGeocodeWithParameters(Point(m_mapView->screenToLocation(mouseEvent.position().x(), mouseEvent.position().y())), m_reverseGeocodeParameters);
// make busy indicator visible
m_geocodeInProgress = true;
emit geocodeInProgressChanged();
});
connect(m_mapView, &MapQuickView::mouseMoved, this, [this](QMouseEvent& mouseEvent)
{
// if user is dragging mouse hold, realtime reverse geocode
if (m_isPressAndHold)
{
m_locatorTask->reverseGeocodeWithParameters(Point(m_mapView->screenToLocation(mouseEvent.position().x(), mouseEvent.position().y())), m_reverseGeocodeParameters);
m_geocodeInProgress = true;
emit geocodeInProgressChanged();
}
});
// reset after user stops holding down mouse
connect(m_mapView, &MapQuickView::mouseReleased, this, [this]()
{
m_isPressAndHold = false;
m_isReverseGeocode = false;
});
// dismiss no results notification and suggestions on mouse press
connect(m_mapView, &MapQuickView::mousePressed, this, [this]()
{
m_noResults = false;
emit noResultsChanged();
emit dismissSuggestions();
});
connect(m_suggestListModel, &SuggestListModel::errorOccurred, this, &OfflineGeocode::logError);
connect(m_suggestListModel, &SuggestListModel::suggestInProgressChanged, this, [this]()
{
m_suggestInProgress = m_suggestListModel->suggestInProgress();
emit suggestInProgressChanged();
});
// if clicked pin graphic, show callout. otherwise, reverse geocode
connect(m_mapView, &MapQuickView::identifyGraphicsOverlayCompleted, this, [this](const QUuid&, IdentifyGraphicsOverlayResult* rawIdentifyResult)
{
// Delete rawIdentifyResult when we leave scope.
auto identifyResult = std::unique_ptr<IdentifyGraphicsOverlayResult>(rawIdentifyResult);
if (!identifyResult)
return;
// if user clicked on pin, display callout
const QList<Graphic*> graphics = identifyResult->graphics();
if (graphics.count() > 0)
m_calloutData->setVisible(true);
// otherwise, reverse geocode at that point
else
{
m_isReverseGeocode = true;
m_locatorTask->reverseGeocodeWithParameters(m_clickedPoint, m_reverseGeocodeParameters);
m_geocodeInProgress = true;
emit geocodeInProgressChanged();
}
});
connect(m_locatorTask, &LocatorTask::errorOccurred, this, &OfflineGeocode::logError);
connect(m_locatorTask, &LocatorTask::geocodeCompleted, this, [this](const QUuid&, const QList<GeocodeResult>& geocodeResults)
{
// dismiss busy indicator
m_geocodeInProgress = false;
emit geocodeInProgressChanged();
if (geocodeResults.length() > 0)
{
// dismiss no results notification
m_noResults = false;
emit noResultsChanged();
// dismiss callouts
m_calloutData->setVisible(false);
// zoom to result's extent
m_mapView->setViewpointCenter(geocodeResults.at(0).displayLocation());
// set pin graphic's location
m_pinGraphic->setGeometry(geocodeResults.at(0).displayLocation());
m_pinGraphic->setVisible(true);
// set callout location and detail
m_calloutData->setDetail(geocodeResults.at(0).label());
m_calloutData->setGeoElement(m_pinGraphic);
if (m_isReverseGeocode)
m_calloutData->setVisible(true);
// continue reverse geocoding if user is pressing and holding
if (!m_isPressAndHold)
m_isReverseGeocode = false;
}
// if there are no matching results, notify user
else
{
m_noResults = true;
emit noResultsChanged();
}
});
}
QString OfflineGeocode::errorMessage() const
{
return m_errorMsg;
}
void OfflineGeocode::setErrorMessage(const QString& msg)
{
m_errorMsg = msg;
qDebug() << m_errorMsg;
emit errorMessageChanged();
}