[OSM-talk] Contour lines

[Keith Sharp]

On Tue, 2010-04-13 at 11:14 +0200, Claudius wrote:
> Am 13.04.2010 10:48, Gregory:
> >
> > On 13 April 2010 01:26, Andrew Errington <a.errington at lancaster.ac.uk
> > <mailto:a.errington at lancaster.ac.uk>> wrote:
> >
> >     I have checked Yahoo! aerials to see the nominal area of the
> >     reservoir and I have chosen a particular contour line on OSM Cycle
> >     Map to trace along with Potlatch.  This will give a
> >     pleasing representation of the area covered by the water.
> >
> > Hey, hold it right there.
> > 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?
> 
> These thoughts set aside here's a SRTM contour tiles link: [1]
> 
> I suggest reading about SRTM as well [2] so that you can assess this 
> data source. For example the 90m resolution outside the USA.

If it's the UK you're interested in then you should look at the newly
released Land-Form PANORAMA data from the OS[3].  I've played with
viewing it in QGIS and it looks fantastic.  Some of the other data
released might also be of interest for water body mapping.

Keith.

[3] https://www.ordnancesurvey.co.uk/opendatadownload/products.html