On Sun, 2008-11-23 at 22:51 +0000, Andy Allan wrote: > On Sun, Nov 23, 2008 at 6:35 PM, Keith Sharp <[EMAIL PROTECTED]> wrote: > > > Anyone have any thoughts as to what is causing this? > > Yep, it's a boundary effect at the edge of each SRTM tile. What you > are seeing is the end of the contour straightening out after it gets > to the last datapoint in the SRTM data. There's a corresponding start > of the same level contour in the next file over, and because the edge > points are shared and overlapping by the SRTM tiles everything meets > fine. So you get a kind of: > \ > \_ > > and > > _ > \ > \ > > meeting at the same point. It's not impossible to detect and edit the > polyline, or even see if there's a gdal_contour option to fix it, but > I haven't spent any time doing so.
Thanks for the explanation. I'm not enough of a whiz at GIS to fix this myself, but I might try and find some giants whose shoulders I can stand on! Keith. P.S. I had noticed that the Cycle Map had voids filled, there were a number around the summit of Ben Nevis. I mentioned it on IRC, just not in my email. _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
