The use of grid squares for the U.K. National Grid was introduced to reduce the number of digits required to give a reference. E.g., for a place with full National Grid coordinates 538857.2345 metres easting, and 177345.3456 metres northing (a position given to the nearest 0.1 millimetres -- pushing the limits of even GPS technology), the grid square designation to the nearest metre is TQ 3885777345. Grid squares are really only helpful for low precision references. See <http://www.gps.gov.uk/natgrid/introduction.asp> for further explanation. -- Richard Langley Professor of Geodesy and Precision Navigation
On Tue, 10 Sep 2002, Ian Maddocks wrote: >Hi Tony > >>Am I correct in thinking that: >>OSX the 'Grid East Value' and >>OSY the 'Grid North Value? in this context? O-) > >Yes - if you look on the OSGB map included in the BSS glassary >http://www.sundialsoc.org.uk/glossary/ap11/ap11.htm >the 0-700km eastings and 0-1300km northings are noted up the sides. > >I first found this form of grid reference used last year - at the end of the >Foot & Mouth crisis i downloaded a table of footpaths in the lake district >that were open , given as 12 figure references! >for example those in NX grid square were 3EEEee5NNNnn. ie what would >normally be NX EEENNN. Yes with enough digits they were quoted to the >nearest meter! > >regards > >Ian Maddocks > > > > >_________________________________________________________________ >Join the world?s largest e-mail service with MSN Hotmail. >http://www.hotmail.com > >- > =============================================================================== Richard B. Langley E-mail: [EMAIL PROTECTED] Geodetic Research Laboratory Web: http://www.unb.ca/GGE/ Dept. of Geodesy and Geomatics Engineering Phone: +1 506 453-5142 University of New Brunswick Fax: +1 506 453-4943 Fredericton, N.B., Canada E3B 5A3 Fredericton? Where's that? See: http://www.city.fredericton.nb.ca/ =============================================================================== -
