There is much more information at the Ordnance Survey website. The national, "OS", grid reference for Dean Royd Farm may then be written as 394026 421179. Grid references are easy if you can remember that you always have to go. Coordinate transformation software Our Grid InQuestII software transforms between the ETRS89 (WGS84) and OSGB36 National Grid coordinate systems. It is straightforward to find a specific place using a grid reference. The map reference conversion spreadsheet (xlsm) will help convert between full national grid references and map tile references that use the 100km square letters. Note: sometimes numbers are used instead of the two-letter grid code.Įxample: the datum point of SD has an easting of 300km and a northing of 400km from the OS "origin". The horizontal lines that run across a map are called northings- they increase in value as they go up the map from the bottom. SD 94026 21179 gives a square metre inside Dean Royd Farm yard, 94026m east and 21179m north of datum. For some abbreviations there may be a grid reference of an example where we have no photograph at present. Click on that map section to display the Ordnance Survey online map at 25K. For example Coll can be by itself or in 'Tech Coll'. Some abbreviations appear in a number of different combinations. To search using British National Grid references, they can be entered into the app or online map. For some abbreviations there may be a grid reference of an example where we have no photograph at present. SD 940 212 gives a 100m square containing Dean Royd Farm, 94.0km east and 21.2km north of the same datum. Click on this to show the photo, its description, and a section of 50K map including the abbreviation. The British National Grid reference system (Ordnance Survey). OSGB36 is what might be termed a traditional datum. SD 94 21 gives a 1km square containing Dean Royd Farm, being 94km east and 21km north of the south-western corner of grid square SD. All mapping in Great Britain is in the OSGB36 National Grid coordinate reference system, and heights are above mean sea level defined at Newlyn in Cornwall Ordnance Datum Newlyn (ODN). References have a degree of accuracy dependent on the number of digits used. To locate a feature within a square on the map, the first part of the reference is distance traveled in an easterly direction from the datum (called the "easting"), and the second part is the distance traveled in a northerly direction (the "northing"). Grid references have their datum, or "origin", at the South West corner of the square, usually this is the bottom left hand corner (when you have north at the top of the map). Every 100km square has a unique pair of letters - for example, Todmorden can be found within the area named SD. Map positions expressed in this system are based on a co-ordinate reference frame observed by two primary triangulations during the 1950’s and 60’s, and combined in one adjustment in 1975 to produce geographic positions (latitude and longitude) for the primary stations in the reference frame. The UK Ordnance Survey (OS) divides the British Isles into 500km squares designated S,N,H,O,T and subdivides these into 100km squares, allocating a second letter to each.
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