[OSM-talk] The long tail - lowest common denominator

Nick Black nickblack1 at gmail.com
Sun Jul 9 13:42:42 BST 2006


On 7/8/06, Lars Aronsson <lars at aronsson.se> wrote:

> Perhaps one could use the coarse vector hydrography of VMAP0 as a
> guide for interpreting nearby dark features in the Landsat images?
> One could run contour detection (between dark blue water and green
> or brown fields) on the Landsat and vectorize this contour, but
> this vector data would also contain lots of irrelevant lines.
> Then one would only keep only those contours which are within,
> say, 400 metres of the VMAP0 hydrography.

I'm not sure that I am  following you Lars - do you mean that we could
use automatic feature detection to detect the edges of water features?

Nick

>
> I think the error can be larger than 200 metres at detailed river
> bends, such as this one,
> http://london.freemap.in/osm.html?lat=8019111.94824&lon=1739910.91992&zoom=13
>
>
> --
>   Lars Aronsson (lars at aronsson.se)
>   Aronsson Datateknik - http://aronsson.se
>
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