[Openstreetmap] Quote for IKONOS images

[Richard Fairhurst]

On 3 Dec 2004, at 19:19, Schuyler Erle wrote:

> However, before we run off in that direction, have a look at the
> pan-sharpened 15m Landsat-7 composite I made last weekend (warning,
> about 5 megs):
>
>     http://locative.us/freemap/data/london-landsat2.tif

That's splendid!

> [...]
> You'll note that, except for the very center of London, one can easily
> make out many of the streets, waterways, parks, and so on in the 15m
> resolution image. Right now I'm trying to figure out whether some kind
> of automated feature extraction would be faster or more effective than
> simply sitting down an army of volunteers with a chunk of the image
> and a vector drawing tool.
>
> Thoughts?

I've always found manual tracing much, much easier than any automated 
method. I experimented a little yesterday running Delineate (uses 
autotrace to produce SVG) over some 1930s maps, but the results 
required so much tidying up that it would have been simpler just to 
trace the paths manually. Illustrator's auto-trace function is a 
similar story.

Richard
www.geowiki.com / www.systemeD.net