QGIS » QGIS Application

When loading a non-georeferenced image in the georeferencer

• the image cannot be seen
  The same is true for pixel based geometries.

Both have been loaded, but are hard to find.
It looks as if they (the pixel values) are being transformed to 'WSG 84'.

The crs of the loaded Raster takes on the Crs of the QGIS-Canvas (or some default settings) , when no georeferenced information was found

• which in my case is a metric system

The QgsMapSettings.destinationCrs() of the mCanvas is 'WGS 84'

QgsMapSettings map_settings=mCanvas->mapSettings();
QgsGeorefPluginGui::addRaster -3- mCanvas->mapSettings description[WGS 84]

I believe this was always the default behavior in the past.

But now, in QGIS 3, an extra step is needed (at least in the georeferencer) to insure that the default QgsMapSettings.destinationCrs() (Wsg 84) of the georeferencer Canvas is not used.

  mLayerRaster = new QgsRasterLayer( rasterFileName, mGcpBaseFileName );
  mCanvas->setDestinationCrs(mLayerRaster->crs());

I am not sure what QgsRasterLayer and QgsVectorLayer use in these cases, looks as if the last used metric system is being taken.

Setting the Canvas with loaded raster crs resoves the problem.

When loading a non-georeferenced image in QGIS itsself, the result is the same as in pre QGIS 3 versions.