View in QML C++ View on GitHub Sample viewer app
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
The sample will load with a map showing a basemap and a loaded raster layer. Tap on "Add Raster" to browse for a new raster file. On desktop platforms the sample also allows you to drag and drop supported raster files to load.
How it works
Create a Raster
from a raster file.
Create a RasterLayer
from the raster.
Add it as an operational layer with map::operationalLayers()::append(rasterLayer)
.
Relevant API
Offline Data
Read more about how to set up the sample's offline data here .
Link
Local Location
Shasta.tif raster
<userhome>
/ArcGIS/Runtime/Data/raster/Shasta.tif
See the topic What is raster data? in the ArcMap documentation for more information about raster images.
data, image, import, layer, raster, visualization
Sample CodeRasterLayerFile.cpp RasterLayerFile.cpp RasterLayerFile.h RasterLoader.qml RasterLayerFile.qml
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// [WriteFile Name=RasterLayerFile, Category=Analysis]
// [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 "RasterLayerFile.h"
# include "Map.h"
# include "MapQuickView.h"
# include "Raster.h"
# include "RasterLayer.h"
# include "Basemap.h"
# include "Error.h"
# include "MapTypes.h"
# include "MapViewTypes.h"
# include "TaskWatcher.h"
# include "LayerListModel.h"
# include "Envelope.h"
# include "Point.h"
# include <QUrl>
# include <QtCore/qglobal.h>
# 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
RasterLayerFile:: RasterLayerFile (QQuickItem* parent /* = nullptr */ ):
QQuickItem (parent)
{
}
RasterLayerFile::~ RasterLayerFile () = default ;
void RasterLayerFile::init ()
{
qmlRegisterType<MapQuickView>( "Esri.Samples" , 1 , 0 , "MapView" );
qmlRegisterType<RasterLayerFile>( "Esri.Samples" , 1 , 0 , "RasterLayerFileSample" );
}
void RasterLayerFile::componentComplete ()
{
QQuickItem:: componentComplete ();
const QString dataPath = defaultDataPath () + "/ArcGIS/Runtime/Data/raster/" ;
// find QML MapView component
m_mapView = findChild<MapQuickView*>( "mapView" );
m_mapView-> setWrapAroundMode (WrapAroundMode::Disabled);
Basemap* basemap = new Basemap (BasemapStyle::ArcGISImageryStandard, this );
m_map = new Map (basemap, this );
m_mapView-> setMap (m_map);
// Create a map using a raster layer
createAndAddRasterLayer (dataPath + "Shasta.tif" );
}
void RasterLayerFile::createAndAddRasterLayer (QString dataPath)
{
// correct data path if contains file:/ prefix
if (dataPath. contains ( "file:/" ))
dataPath = QString ( QUrl (dataPath). toLocalFile ());
//! [RasterLayerFile cpp new raster layer]
Raster* raster = new Raster (dataPath, this );
RasterLayer* rasterLayer = new RasterLayer (raster, this );
//! [RasterLayerFile cpp new raster layer]
connect (rasterLayer, &RasterLayer::doneLoading, this , [ this , rasterLayer]( const Error& loadError)
{
if (!loadError. isEmpty ())
return ;
m_mapView-> setViewpointCenter (rasterLayer-> fullExtent (). center (), 80000 );
});
m_map-> operationalLayers ()-> clear ();
m_map-> operationalLayers ()-> append (rasterLayer);
}