On Tue, 13 Apr 2010, Gregory wrote:
> What makes you think the Yahoo! imagery and/or the contour lines shown on
> the Cycle Map(these contours are from SRTM data, not OSM) are more up to
> date or more accurate/precise than the existing water body drawn in OSM?
Indeed. Also, ISTR the cycle map fakes up realistic looking contours for
void-filling doesn't it?
I don't think the SRTM contours are accurate enough to use for tracing
bodies of water - you need to walk the perimeter with a GPS or use aeriel
photos. SRTM data _may_ be useful for guestimating flowing water courses
that can't be otherwise surveyed, but for this I think you'd really want
to be computing stuff off the raw DEM rather than manually adding
features using the (already quite heavilly processed) contour lines.
--
- Steve
xmpp:[email protected] sip:[email protected] http://www.nexusuk.org/
Servatis a periculum, servatis a maleficum - Whisper, Evanescence
_______________________________________________
talk mailing list
[email protected]
http://lists.openstreetmap.org/listinfo/talk
