[OSM-dev] openstreetmapdata.com

Paul Norman penorman at mac.com
Mon Mar 11 03:44:31 UTC 2013

It is potentially possible for the results of OSMCoastline to be absurd. In
these cases, my understand is the new files might not be posted.


There are a couple of coastline error displays. One is the coastline layer
in OSMI at http://tools.geofabrik.de/osmi/?view=coastline which shows errors
found by OSMCoastline. Another is http://wightpaths.co.uk/coast/ which shows
the results of coastcheck, the software used for the coastline on
tile.openstreetmap.org. I supply the results as part of my generation of
http://pnorman.dev.openstreetmap.org/coastlines/. It's worth noting that I
do not do any checks on my data. It's the result of  an entirely automatic
process that just uploads the results of coastcheck.


From: Preet [mailto:prismatic.project at gmail.com] 
Sent: Sunday, March 10, 2013 7:34 PM
To: dev at openstreetmap.org
Subject: [OSM-dev] openstreetmapdata.com



First off, thanks to Jochen for creating such an awesome service. The
hardware I have isn't really capable of extracting coastlines from
planet.osm in any reasonable amount of time, so having updated data
available is invaluable for me!

I had a question about one of the notes on the coastline data:

"The coastline in OpenStreetMap is often broken. The update process will try
to repair it, but this does not always work. If the OSM data can't be
repaired automatically, the data here will not be updated."

What does this mean exactly? Is there a chance poorly defined coastline data
won't be seen in the resulting shapefile? ie, could there be chunks of
coastline simply missing? Or is there a 'decent' baseline, and only newly
updated coastline data that's bad won't be processed to reflect the changes?


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