We experience crashes when using Surface elevationAsync() with a RasterElevationSource when querying outside the extent of the RasterElevationSource.
Our underlying RasterElevationSource data are DTED2 Files of Germany.
We query the elevation on a timer (every 15 ms). We experience no crashes when querying the elevation inside Germany only.
The crash does not happen instantly, it happens suddenly over time. Sometimes it takes a minute for it to crash. Sometimes less, sometimes more. But it always happens after a while.
We are using the most recent ArcGIS Maps SDK 200.6 on Windows 10.
MultipleElevationSources::MultipleElevationSources(QObject* parent /* = nullptr */) : QObject(parent)
{
m_scene = new Scene(this);
QUrl imageLayerUrl("https://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer");
auto baseLayer = new ArcGISMapImageLayer(imageLayerUrl, this);
auto basemap = new Basemap(baseLayer, this);
m_scene->setBasemap(basemap);
m_querySurface = new Surface(parent);
auto queryRasterFilesPaths =
getRasterFilesPaths((defaultDataPath() + "/ArcGIS/Runtime/Data/raster/GermanyElevation").toStdString());
auto queryElevationSource = new RasterElevationSource(queryRasterFilesPaths, m_querySurface);
queryElevationSource->load();
m_querySurface->elevationSources()->append(queryElevationSource);
}
void
MultipleElevationSources::connectSignals()
{
QTimer* timer = new QTimer(this);
connect(timer, &QTimer::timeout, this, [this] {
// wkid 4326
// World:
// Using these causes a crash, since queries will be outside data
// x from -180 to 180
// y from -90 to 90
auto x = randomValue(-180.0, 180.0);
auto y = randomValue(-90.0, 90.0);
// Germany
// Using these does not cause a crash, since queries will always be inside data
// x from 11.6 to 14.8
// y from 47 to 54
// auto x = randomValue(11.6, 14.8);
// auto y = randomValue(47, 54);
Point point{x, y, SpatialReference(4326)};
fetchAltitude(point);
});
timer->start(10);
}
void
MultipleElevationSources::fetchAltitude(const Esri::ArcGISRuntime::Point& point)
{
elevationQuery(m_elevationFuture, m_querySurface, point);
}
void
MultipleElevationSources::elevationQuery(QFuture<double>& future, Surface* surface, const Point& point)
{
if (future.isRunning()) {
qDebug() << "Is running...";
return;
}
if (!future.isFinished()) {
//future.cancel();
qDebug() << "Not finished with query yet!";
setAltitude("Waiting");
return;
}
future = surface->elevationAsync(point);
future
.then(
this,
[this](double altitude) {
qDebug() << altitude;
setAltitude(QString::number(altitude));
})
.onCanceled([this] {
qDebug() << "Canceled";
setAltitude("Canceled");
})
.onFailed([this] {
qDebug() << "Failed";
setAltitude("Failed");
});
}
When the crash happens we get the following
Clicking ignore causes the application to crash.
QML Debug Window:
Assertion failed: e && e->get_objectType() == QRTElementType::QRTElementType_float64, file ..\..\qt\common\qt_common\Core\TaskImpl.cpp, line 265
The QML File looks as follows:
import QtQuick
import QtQuick.Controls
import Esri.Samples
Item {
// add a SceneView component
SceneView {
id: view
anchors.fill: parent
Component.onCompleted: {
// Set the focus on SceneView to initially enable keyboard navigation
forceActiveFocus();
}
Text {
text: model.altitude;
font.family: "Helvetica";
font.pointSize: 24;
color: "red";
anchors.bottom: parent.bottom;
anchors.right: parent.right;
anchors.bottomMargin: 20;
}
}
// Declare the C++ instance which creates the map etc. and supply the view
MultipleElevationSourcesSample {
id: model
sceneView: view
}
}
Our use case is querying the elevation on mouse hover. That's when we encountered this crash occasionally.
Find attached the cpp, hpp, qml source file. (Ignore the filename / class name "MultipleElevationSource", that is for another issue, here we only use 1 elevation soruce.)
