Ordnance Survey Benchmark
You may have seen one of these before on your travels. This is the one on All Saints' church here in Milton. It's an Ordnance Survey benchmark, a type called a "cut mark" one, i.e. it's carved into the stone. If you look it up in their database it's 7.646m above sea level and 1.1m above the ground and it's a secondary mark. Last levelled in 1971. Verified in 1984.
Having read up on this then if I understand the maths correctly the nearest "fundamental benchmark", which is considered error free, is at Wicken, which is 11.35km away and hence the error on this benchmark1 is:
Uh huh. I'll bear that in mind when I'm trying to keep my nose out of the water.
|Tags: Milton, photos||Written 10/05/15|
|Date/Time Taken:||2015-05-10 08:55:57|
|Focal Length In 35mm Film:||unknown|
|Lens Model:||Minolta MD Zoom 35-70mm MDIII|
|Location:||0° 9' 59" E, 52° 14' 39" N|