Yes, in France, we did a similar import last year. We imported directly all landuse polygones that did not overlap more than 2% with already existing landuse in OSM (175.000 created in this way). <br>Here are the details of how the dataset avoiding the overlap was created:<br>
<a href="http://wiki.openstreetmap.org/wiki/WikiProject_Corine_Land_Cover/Corine_Data_Import">http://wiki.openstreetmap.org/wiki/WikiProject_Corine_Land_Cover/Corine_Data_Import</a><br><br>Then we deployed a map server showing the remaining polygones which can be opened and manually merged using JOSM (and its remote control plugin) with all related metadata (zoom in to see the markers):<br>
<a href="http://clc.openstreetmap.fr/cgi-bin/index.py">http://clc.openstreetmap.fr/cgi-bin/index.py</a><br><br>Each polygone can be marked as "imported" or "rejected" by anyone who think that the job is done. A wiki page explaines the manual import steps. The import status of each polygone showed on this map is stored in a separate database.<br>
<br>One remaining issue is the size of some polygones. Although we created multipolygones relations, sometimes the size is simply too big for a normal JOSM editor environment.<br><br>Pieren<br>