coordinate systemgoogle mapsqgiswgs84xyz-tiles
I have a shapefile of building lots in Manaus, Brazil, that I have re-projected into the WGS84 (EPSG:4326) CRS using the "project" tool in ArcGIS. I am now working in QGIS, and am trying to add the Google Maps XYZ Tile to this layer. However, it appears that these two layers are not projecting properly:
How can I transform the CRS to make the projections match?
My friend was able to fix the problem in ArcGIS by changing the properties of the data frame – is there an analogous operation in QGIS?
The first layer is definitely not WGS84 longlat, but something projected like UTM or other systems used in Spain. The second one might be correct.
I imported the extents as delimited text, setting WGS84-UTM 30N EPSG:32630 for the large ones (in green) and WGS84 EPSG:4326 for the small ones in red, On-the-fly-reprojection activated. Project CRS is set to EPSG:3857 to add an OpenStreetMap background from the Openlayers plugin:
You have to use Rightclick -> Set CRS for Layer on the first layer to get the right CRS. Reprojecting is not a good idea, because the coordinates are in another (wrong) CRS than is specified for the layer.
I tried an imagery from OpenAerialMap and it aligns with the OSM building layer well.
Of course, buildings in OSM, most probably, were traced over this OpenAerialMap images, so they match them.
All satelite images could have alignment errors (as well as data traced among them). The quality of image referencing connected with:
Best Answer
Seems to be a problem with the CRS of the shapefile layer.
In QGIS, it can be changed in Layer > Properties > CRS.
Changing the CRS of the layer doesn't modify the coordinates of its geometries, but the way they should be interpreted.
When you find and assign the correct CRS in which the coordinates of the geometries must be interpreted (always rendering the canvas, that is, establishing for the project, to EPSG: 3857 due to the base map), you can reproject the layer to another CRS if you want it.