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trigonomy

Group Information

  • Members: 347
  • Category: Hiking
  • Founded: Sep 17, 2002
  • Language: English
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Activity within 7 days:

14 New Messages - 1 New File - New Questions

Description

This group is for discussion relating to Ordnance Survey triangulation pillars, flush brackets, bench marks, and other Ordnance Survey structures. The emphasis is on the historical and technical aspects, and on maintaining lists of pillars and related structures.

Photo: Elsworthy, Exmoor (grid ref SS812415) 'S5034'.

[Key words: Ordnance Survey, Ordnance Survey Ireland, Ordance Survey Northern Ireland, triangulation pillars, flush brackets, bench marks, levelling, geodetic.]

Message History

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2009 14 2 28 21 44 34 126 70 46 25 16
2008 78 28 21 30 24 11 10 46 38 17 14 9
2007 50 34 18 28 38 11 10 22 16 9 11 30
2006 63 68 58 30 28 10 26 19 12 27 31 37
2005 120 21 10 17 20 48 28 42 21 24 23 45
2004 17 14 17 42 16 38 133 208 101 64 56 66
2003 26 27 16 13 23 25 22 16 35 9 9 23
2002 14 69 62 30
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