"Yoss1960" wrote in message
On Fri, 15 May 2009 10:39:19 +0100, Phil Cook wrote:
I think the blankest square found on OS 1:50k had a drainage ditch
and a contour
There's a square with only an HT line across one corner.
See number 2, here;
There's an interesting spot below Beast Cliff in North Yorkshire, in which
about 10m^2 of land above the high water line represents the entire land
surface of the 'OV' 100km National Grid square.
This means that the OV square is 99.9999999% water.