[Talk-us] hydrology Alaska

Christoph Hormann osm at imagico.de
Wed Oct 18 16:18:48 UTC 2017

On Wednesday 18 October 2017, Andy Townsend wrote:
> https://www.openstreetmap.org/#map=17/69.94271/-152.49898
> isn't the result of simplification, though, is it?  You can see the
> pixels...

Like others here i have no practical experience with scanaerial but it 
seems the vectorization algorithm used is very non-sophisticated 
leading to the geometries shown.  Tracing higher resolution images at 
higher resolution and running Douglas-Peucker over it will likely not 
produce good results either (you will get the typical jagged corners).

Those cases where good results were achieved with scanaerial seem to be 
using relatively low resolution images processed at a much higher 
resolution - like here:


Christoph Hormann

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