80n wrote:

> If you accidentally hit the wrong key, then you can just hit the right 
> key.  The last value entered will always supersede any previous value.
> 
> Maartin, did your analysis take account of this?  How did you reconcile 
> contradictory entries for the same tile?

Yes. I updated oceantiles.png in order of date, oldest first. So older 
"mistakes" are corrected by newer entries.

> I'm puzzled by why low x/y tiles have more errors?  I can't think of any 
> reason for such a bias.  Can you point to a few low x/y tiles that are 
> wrong, please?  I can investigate the logs and see if that gives some 
> clues for the cause of the bias.

Everyting where X and Y are 600 or lower
These tiles are clearly some kind of vandalism. Be it "try out" vandalism or 
otherwise.

For interest: I've put the resulting picture on my webspace: 
http://www.maasluip.nl/temp/oceantiles_12.png

Maarten

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