How do you reproject a layer in QGIS?
Select any of the layers as input, and select EPSG:23029 as the destination CRS. Run the algorithm and you will get a new layer, identical to the input one, but with a different CRS. It will appear on the same region of the canvas, like the other ones, since QGIS will reproject it on the fly, but its original coordinates are different.
When to use the CRS of the first layer in QGIS?
CRS’s are a great source of confusion for QGIS Processing users, so here are some general rules about how they are handled by geoalgorithms when creating a new layer. If there are input layers, it will use the CRS of the first layer. This is assumed to be the CRS of all input layers, since they should have the same one.
Why do geoalgorithms ignore the reprojections of QGIS?
The main idea behind these examples is that geoalgorithms use the layer as it is in its original data source, and completely ignore the reprojections that QGIS might be doing before rendering. In other words, do not trust what you see in the canvas, but always have in mind that the original data will be used.
Where to find EPSG in crss.reprojecting-QGIS?
You should find the resulting layer rendered exactly in the same place as the other ones, and it will have the EPSG:23030 CRS, since that was the one of the input layer. If you go to its attribute table, you will see values that are different to the ones in the first layer that we created.
Why is QGIS reprojecting on the fly to project CRS?
They both contain the same points, but in different CRSs (EPSG:23030 and EPSG:4326). They appear in the same place because QGIS is reprojecting on the fly to the project CRS (EPSG:4326), but they are not actually the same layer.
What is the CRS of the input layer in QGIS?
If you right click on the name of the layer and open its properties, you will see that it shares the same CRS of the input layer, that is, EPSG:4326. When the layer is loaded into QGIS, you will not be asked to enter the CRS of the layer, since QGIS already knows about it.
Why do columns appear in the same place in QGIS?
They appear in the same place because QGIS is reprojecting on the fly to the project CRS (EPSG:4326), but they are not actually the same layer. Open the Export/Add geometry columns algorithm. This algorithm add new columns to the attributes table of a vector layer.