I'm trying to merge the geometries and attributes of a TIGER census block shapefile with those of a vector land cover shapefile. However, I'm not getting the results I want. Whenever I run Union in QGIS, I get one geometry or the other, not a combination of both. When I open up the attribute table, both entries are there but they are separate not merged. Which geometry I get seems to depend on which one I select first in the Union window. Can anyone tell me why the geometries and attributes are not merging?
From your description I understand that you need to merge items from the same layer. If you want to merge items in the same layer make sure that the "Advanced Digitizing Toolbar" is marked be clicking on the right bottom in the muse in the area of the Toolbars Now you need to mark the item you want to merge Once they are marked use the "Merge Selected Features" and press "O.K" (it's in Hebrew on me screen, so maybe in English it will "Approval" or something similar) Now all the items that was overlapping are transformed into one merged item You also can use the "Dissolve" option in the Vector Toolbar.