ordnance datum sentence in Hindi
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- Countries tend to choose the mean sea level at one specific point to be used as the standard sea level for all mapping and surveying in that country . ( For example, in Great Britain, the national vertical datum, Ordnance Datum Newlyn, is based on what was mean sea level at Newlyn in Cornwall between 1915 and 1921 ).
- At ordnance datum ( OD ), the mean height above sea level, Dunkery Beacon is the highest natural point in Somerset, although the tip of the Mendip TV Mast is higher at OD . Dunkery is ranked 23rd in the UK in terms of dominance and is a Marilyn, meaning that it is a peak with or more of relative height.
- Samuel Murphy calculated that the three levels had been 659 metres above ordnance datum ( AOD ), 631 metres AOD and 581 metres AOD . These three old levels imply a lot of mining work had been done before William Sheffield abandoned the mine, some time before 1819 . In addition, a fourth old level ( the " Hush Level ", see below ) was driven in this early period, and a fifth level ( later known as the " High Level ", or the " High Horse Level " ) had been started before the mine was abandoned.
- The ground level before construction varied between 3.35m and 5.18m ( 11 and 17 ft ) ordnance datum ( O . D . ) In order to provide adequate protection against flooding, the area in which the main building is constructed was raised to 7.92m ( 26 ft ) O . D . by filling from borrow pits on site, but the coal store and cooling tower area remain at the original level of 4.87m ( 16 ft ) O . D . The nature of the sub-soil was investigated by trial bores and found to be good load bearing marl at depths between 4.26m and 12.19m ( 14 and 40 ft ) below the existing ground level and overlain by sand and gravel strata on top of which lay clay or silt and top soil.
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