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Old May 15th 09, 06:05 PM posted to uk.rec.walking
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Default OS map 5m contours

"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.