[OSM-talk] New tool: Generate coastlines from Landsat imagery

Brent Easton b.easton at exemail.com.au
Sun Aug 5 03:11:26 BST 2007

Hi Darryl,

Very nice tool, but it is not possible to map coastal lakes connected to the sea on the East coast of a continent.

If you pick a point inside the lake, it goes east, hits the lake edge, traces round, out to the coast, then follows the coast northwards.

If you pick a point in the sea, it heads off accross the pacific trying to find a landfall!

I you just need a couple of extra parameters to

 a) Select the inital search to be East or West (or South or North?)
 b) Select to trace Clockwise or anti-clockwise once landfall reached.

I learn't Perl yesterday, will try and learn Python this afternoon and send you some mods!


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On 3/08/2007 at 9:11 PM Darryl Shpak  wrote:

>Hi all,
>I've just checked in Lakewalker, a tool that can be used to 
>automatically generate coastline data from NASA's Landsat imagery. I've 
>used it to trace a lot of the lakes and islands in my area; an example 
>can be seen at 
>The resulting data is significantly higher resolution than the PGS 
>import, and can be used in areas where there is no PGS data.
>Lakewalker resides in 
>svn.openstreetmap.org/applications/utils/import/lakewalker, and requires 
>Python and the Python Imaging Library. Minimal documentation is 
>available in the README and with the --help option.
>If you have questions or suggestions, feel free to email me directly or 
>look for me on #osm.
>- Darryl (DShpak)
>talk mailing list
>talk at openstreetmap.org
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Brent Easton                       
University of Western Sydney                                   
Email: b.easton at uws.edu.au

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