[OSM-dev] Coastline generalization tool and data

[Michal Migurski]

Christoph, this is so cool. Excellent work!

I've been hammering away at an OSM generalization effort of my own, focused on the global preparation of simplified linework for major roads and route relations:
	http://www.openstreetmap.us/~migurski/streets-and-routes/

It's based on work that I started in 2010 and 2011 and released as the Stamen Terrain layer:
	http://mike.teczno.com/notes/osm-us-terrain-layer.html
	http://maps.stamen.com/terrain/

I did find one weird part of your data, around Boston where the peninsula appears detached from the mainland.

-mike.

On Feb 11, 2013, at 4:42 AM, Christoph Hormann wrote:

> 
> Hello everyone,
> 
> some time ago i introduced a technique to generalize OSM coastline data 
> for better readable map rendering [1] on talk-de and i now release the 
> tool used for this [2] as well as a set of generalized coastline files 
> for zoom levels 1 to 8 [3].  There is also a demo map [4] - this uses a 
> slightly different coastline than the one for download (in particular 
> Antarctica data is replaced by a different source).
> 
> Feedback on both the tool and the files is welcome.  It would be 
> interesting to see how use of this would look like in the standard 
> mapnik rendering, especially how much mismatch the moving of the 
> coastline during generalization causes and how troublesome this is when 
> viewing the map.
> 
> You might notice various strange forms in the coastline at some places, 
> most of them are caused by features being tagged as coastline which in 
> fact should probably not be.  I put up a wiki page [5] to collect these 
> problems.  If you find more or fix them feel free to edit that.
> 
> [1] http://www.imagico.de/map/coastline_en.php
> [2] http://www.imagico.de/coastline_gen/index.php
> [3] http://www.imagico.de/map/coastline_download_en.php
> [4] http://www.imagico.de/map/map_en.php
> [5] 
> http://wiki.openstreetmap.org/wiki/User:Imagico/coastline_problems_for_generalization
> 
> 
> Greetings,
> 
> -- 
> Christoph Hormann
> http://www.imagico.de/
> 
> _______________________________________________
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> dev at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/dev
> 

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