I know this may sound like a silly question, and it is, but I've read lots of questions and tutorials, watched a few videos and still can't properly understand what I should do...
I am trying to work with Rio de Janeiro's datasets at two different administrative levels: neighbourhoods and administrative regions. Their shapefiles are made available by Rio's city hall, but are set in different CRS (i'll link them by the end of the post). The neighbourhoods shapefiles are set in EPSG:31983 and the administrative region in EPSG:29193(29183).
How can I get the shapefiles to align correctly?
When loading both shapefiles, the neighbourhoods CRS is correctly interpreted by QGIS (I should mention that I'm using QGIS 3.2), which sets it as 31983. The administrative regions are not, and QGIS generates a CRS.
From my understanding the next step should be to reproject this layer onto its right CRS, 29193 (or 29183, I don't know, but either way it doesn't come up right). When I do this the shapefiles are almost aligned, but they're not. They are some 15 meters misaligned.
Thinking that I might have understood something wrong, I tried another approach. I changed the administrative region's CRS via "set layer CRS" in the properties to 29123, and after that reprojected it to 31983. Again, with no success.
I've tried basically all combinations with reprojecting the layer and changing the CRS, but none worked. The first approach is the one I thought would be correct, but I ended up getting frustrated and trying several others.
The links I mentioned earlier in the post: