Loaded Raster Layer has a null WKID

imbachb

I'm using following geotiff raster layer sample dataset: swissALTI3D sample data - swisstopo

Direct download link: https://cms.geo.admin.ch/Topo/swissalti3d/swissalti3dgeotifflv95.zip

I would like to show this raster layer on top of a basemap. I initialize both like this, with 2056 being the spatial reference system the raster layer is based upon.

 

m_map = new Map(SpatialReference(2056), 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_map->setBasemap(basemap);

const QString filepath =
	defaultDataPath() + "/ArcGIS/Runtime/Data/raster/SWISSALTI3D_TIFF_CHLV95_LN02/0.5m/SWISSALTI3D_0.5_TIFF_CHLV95_LN02_2600_1196.tif";
Raster* raster = new Raster(filepath, this);
m_rasterLayer = new RasterLayer(raster, this);

m_map->operationalLayers()->append(m_rasterLayer);

 

The resulting map only shows the basemap and not the added raster layer. The raster layer does not report any errors.

When I do not load the basemap then the raster layer is visible.

When I log the raster layer's fullExtent its json representation looks like this:

 

// auto envelope = m_rasterLayer->fullExtent();
// qDebug() << envelope.toJson();
{
    "xmin": -0.5,
    "ymin": -6999.5,
    "xmax": 6999.5,
    "ymax": 0.5,
    "spatialReference": {
        "wkid": null
    }
}

 

implying that there's an issue with the raster layer's spatial reference.

I can load this raster layer perfectly into ArcGIS Pro where it automatically gets the correct spatial reference.
Does anyone have a clue on what I might be doing wrong here?

Many thanks!

GuillaumeBelz

Hello,

Non-common transformations are supported using projection engine data. All details are explained here https://developers.arcgis.com/qt/spatial-and-data-analysis/spatial-references/ and you can download data here https://developers.arcgis.com/downloads/#pedata.
You can use `TransformationCatalog::setProjectionEngineDirectory` https://developers.arcgis.com/qt/cpp/api-reference/esri-arcgisruntime-transformationcatalog.html#setProjectionEngineDirectory to set the path to transformation data.

const QString dataPath {"path/to/Projection_Engine_Data_200_2_0/pedata"};
TransformationCatalog::setProjectionEngineDirectory(dataPath);