On Nov 17, 2011, at 6:46 AM, Frank Steggink wrote:
> Quoting Michal Migurski <[email protected]>:
>
>> A cry of frustration:
>>
>> I do bimonthly runs of the worldwide coastlines
>> (http://metro.teczno.com/#coastline), and Canada seems to be a recurring
>> source of problems. What the heck is going on up there? I consistently see
>> new imports of what seems to be Canvec data screwing up coastlines and
>> making for some deeply broken renders:
>>
>> http://mike.teczno.com/img/broken-coast.png
>
> Hi Michal,
>
> The rendering error northeast of Quebec City was caused by a novice user who
> has adjusted the Canvec data which was already there. The import in this
> region was done by me about half a year ago.
>
> The user in question had adjusted the coastline tags to waterway=riverbank,
> in order for him to show it up properly on his GPS (while using mkgmap for
> the conversion). He already became aware of what he has done, and has fixed
> the error himself (which I think is laudable). I've done a check, and the
> coastline looks all right to me. I'm not sure what to do with the remaining
> waterway=riverbank tag. This is part of a larger discussion about what to do
> with large waterbodies.
>
> The slippy map doesn't show the corrected situation yet, because the
> coastline shapefile is not updated very often.
I had noticed a lot of waterway=riverbank up there, you're right.
The first black and white image I link above is derived from the current,
November 10 planet dump, so it's a very recent picture of coastline errors.
Many of those errors didn't exist in the coastline I made from the November 3
planet dump.
Here are some sample locations in Canada where the checker has found errors:
http://www.openstreetmap.org/?lat=58.790035&lon=-94.202604&zoom=17&layers=M
http://www.openstreetmap.org/?lat=56.749700&lon=-92.698650&zoom=17&layers=M
http://www.openstreetmap.org/?lat=45.260826&lon=-66.086208&zoom=17&layers=M
http://www.openstreetmap.org/?lat=45.298267&lon=-66.117219&zoom=17&layers=M
http://www.openstreetmap.org/?lat=56.970073&lon=-92.627314&zoom=17&layers=M
http://www.openstreetmap.org/?lat=47.086208&lon=-70.745529&zoom=17&layers=M
http://www.openstreetmap.org/?lat=57.053591&lon=-92.000000&zoom=17&layers=M
http://www.openstreetmap.org/?lat=45.238757&lon=-66.055341&zoom=17&layers=M
http://www.openstreetmap.org/?lat=44.936914&lon=-74.704294&zoom=17&layers=M
-mike.
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michal migurski- [email protected]
415.558.1610
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