"I think the question about tagging was refering to how you translate the Corine-tags to OSM-tags, and which tags from Corine you translate and which you drop."
Let me put it this way. Some guy in the past has already converted the CLC dataset to .osm. I don't have the smallest clue who did it and how. Now I and the other importers are uploading this file in small pieces. "this is surprising news, really, CLC is more accurate in your area than what is in OSM?" Welcome to Eastern Europe! The huge majority of landuse data in Hungary comes from CLC. At most parts, where no data from CLC has been imported, there are no landuse polygons. See http://www.openstreetmap.org/?lat=46.848&lon=18.51&zoom=10&layers=M. If we did not use CLC, there would be almost NO landuse data at all. I do also have concerns with the dataset. But currently it is the best we can do. "You shouldn't really do this, as it is mostly considered bad practise or even vandalism, as you are deleting the history of these objects." OK, I wanted to mean those forests which has been imported from CLC some time ago but without the neighboring farm, vineyard, etc. areas. "so when in doubt I agree it is better to keep what is already there in OSM." I was saying the same. I merely tagged these as "fixme=...". Anyway, Bing is very outdated in Hungary. Images are about 10 years old and low resolution at some places. "If you traced these features by hand from aerial imagery, would you do it in the way CLC did?" I would do better, but then please look at this area: http://www.openstreetmap.org/?lat=47.8738&lon=19.4649&zoom=13&layers=M There is no high resolution Bing imagery here. Now our only realistic choice to add landuse data about this place to OSM is to use CLC. "It further seems all polygons are overlapping and there are no multipolygon-relations at all?" Thanks for pointing that out! I must tell I'm surprised of how this guy imported CLC data -- it was not me at that area. I'm using proper relations. I will probably write him about this. You are right anyway that the polygons need further alignment and simplification. It needs some work to improve the accuracy of the imported CLC data. But I believe in an incremental mapping process. For hikers, hunters, etc. these small misalignments do not mean any problem. Rather, it presents extra information on landuse which may be off by say 10m, but will be continuously improved in the future. Once the data is out on OSM, other contributors will be able to correct errors and improve map quality.
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