#ORDNANCE SURVEY GRIDS HOW TO#

Meanwhile, Ordnance Survey uses the Airy 1830 ellipsoid which fits System, 1984) ellipsoid which is a good approximation to the shape of the EarthĪs a whole. The earth below there exists a globally best-fitting ellipsoid and a locallyīest-fitting one which is more accurate for a specific area of the Earth.Īs a practical example, most GPS receivers use the WGS-84 (World Geodetic For example, on the (greatly exaggerated) cross section of There are many standard ellipsoids in use, and each has its own benefits and How big is the ellipsoid? How distorted is it? Where is the centre? Where is the Sphere) is a pretty good approximation, it leaves us with even more questions. Though an ellipsoid (a slightly elongated The other issue we have is that the Earth is not a perfect sphere, in fact, it As you can imagine, the precise definition of this point

This is madeĮspecially difficult by the fact that points on the Earth's surface are inĬonstant motion. Instead we have to choose an arbitrary point to be 0°. Though we can easily define theĮquator as being the half-way point between the poles (which we can pin-pointīecause the earth is spinning), there is no such luck for the prime meridian. Problem is how we define the prime meridian. Unfortunately, life is not as simple as it first appears. Finally, there is also some measure ofĪltitude which you might think of as being a height above sea level. West-east line) and the longitude is the angle between it and the 'prime Latitude of the point is the angle between it and the equator (the thick Picture below represents the earth and the star is some point on the earth. To start lets define what we mean by latitude and longitude. Materials on which this article is based. Instead referring to the excellently written (beginner friendly) source Understanding of what is going on I strongly recommend not reading this and This is not a misleading summary if you're interested in getting a deep This article contains many simplifications to keep things short. Working towards answering my initial question. Hand-wavy explanation of why everything can't just be nice and simple while also Many wildly differing yet very sensible definitions. Two, the question also fails to realise that 'latitude' and 'longitude' have Not only is it not actually possible to make an exact conversion between the Question sounds fairly reasonable, it actually hides a large degree of naivety. Ordnance Survey grid references' and recently finally found out.

#ORDNANCE SURVEY GRIDS HOW TO#

I have often naively wondered how to 'convert from latitude and longitude to It’s a truism that we can’t really fully appreciate and understand.How to Convert from Latitude and Longitude to Ordnance Survey Grid References This is what engenders the most interest for me in travel: investigating and observing the way people solve their problems, live their lives and look after themselves and each other. We write about culture, which means much, much more than cuisine, clothing and language. Find coordinates of places, cities, towns. Terms and conditions Find coordinates by click or by address on map. Find coordinates of place, by a click on the map or by filling in input field. We and our partners store and/or access information on a device, such as cookies and process personal data, such as unique identifiers and standard information sent by a device for personalised ads and content, ad and content measurement, and audience insights, as well as to develop and improve products.With your permission we and our partners may use precise geolocation data and.

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grid-reference (square) grid-reference (centroid) Easting/Northing co-ordinates (GB) Easting/Northing co-ordinates relative to 100km square Lat/Lng centroid (WGS84 projection) Irish Transverse Mercator (ITM) column number for grid-refs. Grid-ref parser (bulk) format of references. Used alongside your Ordnance Survey map, OS Locate is a fast and highly accurate means of pinpointing your exact location on the map, anywhere in Great Britain. Do you know where you are? Make the most of your adventures in the great outdoors with OS Locate. Check your location, even with no mobile signal. 6 fig grid ref is in the text box that appears (large pale orange box is the area covered by that grid ref). To obtain grid ref: Set dropdown list in bottom left box to 'Location Details'. Search using a known grid ref using the pin button at top right of map and then zooming on map as necessary.

Ordnance survey grids