[OSM-talk] Bad coastline data

David Groom reviews at pacific-rim.net
Sat Mar 24 15:51:15 GMT 2007


----- Original Message ----- 
From: "Bruce Cowan" <bruce.cowan at dsl.pipex.com>
To: <talk at openstreetmap.org>
Sent: Saturday, March 24, 2007 3:28 PM
Subject: [OSM-talk] Bad coastline data


>I have noticed many cases where there are holes in the coastline data.
>
> One such area is Oban[1], where the coastline data has the tag
> "created_by=dmgroom_coastlines".
>
> Another area was the island of Cumbrae[2], which had a large coastline
> hole in it until I filled it in with reference to landsat.
>
> Since Scotland (especially the West Coast) has a lot of coastline, these
> holes are concentrated here.
>
> I assume the PGS data is automatically generated from satellite photos,
> and in these cases, there was a cloud in the way.

That is correct, the west coast of Scotland was particularly bad for cloud 
cover and loss of coastline data in the PGS files .

David

>
> [1]
> http://www.informationfreeway.org/index.php?lat=7643474.113&lon=-610903.70691&zoom=13&layers=B00
> [2]
> http://www.informationfreeway.org/index.php?lat=7511973.78896&lon=-546429.08752&zoom=13&layers=B00
> -- 
> Bruce Cowan <bruce.cowan at dsl.pipex.com>
>
>
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