OpenStreetMap
Why do some people just upload a new track without any regard for a track that's already there? I've seen areas that I've mapped show up with an overlapping track. Every time I upload, I download first, and if the track is already there, I just edit the existing track and then remove mine before uploading the changes. Then if the original track seems to be the same as mine without much change, I assume it's just a difference in GPS software, and I make no changes.
After a while of people just randomly uploading whatever they have, the database could wind up with 20x more data than is necessary or more. I've already edited areas that had the same road uploaded 4 or 5 times.
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My other comment about laziness deals with people using the aerial photo in the online OSM editor without actually visiting or GPS tracking the area.
I've gone through efforts to actually GPS map areas that are new construction. Places that the roads and bridges have been completely moved.
People go into the online editor and think that the aerial view is still correct, but it's out of date. I've ridden the areas. I know that what I've put there is correct. Why do people insist that the map is right if they've never been there?
When I started participating in the OSM project, I read all of the guidelines, and one of the primary ones was "if you haven't been there, don't update the map". Well, it seems that a lot of people are doing just that.
It would be nice if there was a way to prevent people from just uploading their GPX files. Force them to actually LOOK at the map they're about to modify. Heck, maybe even remove the aerial photography so that it forces people to actually go to the place they're trying to change.
Sorry to rant, but I've just seen hours of my work erased because some jerk thinks the aerial photo is correct. :(