I know how to get the geometry (x,y) into Attribute fields with the Calculator, but I can't figure out how to update the geometry from values contained in attributes.
I am trying Field Calculator > Update existing field > <geometry>, but I can't find how to assign my "x" and "y" fields to the actual feature geometry.
I don't want to manually drag each point with the vertex editor, or type in each coordinate. I have to update many points.
Assuming you have chosen <geometry> field in the Update existing field drop down list, the expression you need would be:
geom_from_wkt('POINT('||"x"||' '||"y"||')')
geom_from_wkt('POINT('||'31.797788'||' '||'30.729471'||')') Notice the single quotes. Using double quotes in QGIS 2/3 will cause an error as it mistakens the x and y values as field names.
Another option is to use the make_point() function together with updated fields "x" and "y".
before change :
window :
after change :
I modified this a bit to move a selection of points into a spread out line along a vertical axis.
geom_from_wkt('POINT('||$x||' '||((@row_number*100)+$y)||')')
The 100 can be changed to whatever is appropriate for your area and scale. I imagine that this could be further modified to create a grid, but I didn't have time to try.
