![]() ![]() When reporting locations as OS grid references, the relevance of precision is often overlooked. Ultra-high precision generally exceeds everyday requirements. High precision format sometimes useful for static species of particular interest. Most widespread format suitable for many uses. Low resolution often sufficient for highly mobile species (eg. Applications of OS Grid reference values: However grid references can be specified to other levels of precision for example, many GPS units and online mapping resources provide 8-figure or 10-figure OS grid references as standard. This level of precision resolves to a 100m-square on the ground, which is adequate for most applications. OS grid references are most usually given in six-figure format (eg. 10ths of each 1000th)Īdditional horizontal/vertical offset in units of 1/100000 of a grid-square (ie. 10ths of each 100th)Īdditional horizontal/vertical offset in units of 1/10000 of a grid-square (ie. 10ths of each 10th)Īdditional horizontal/vertical offset in units of 1/1000 of a grid-square (ie. Primary horizontal/vertical offset in units of 1/10 grid-square sideĪdditional horizontal/vertical offset in units of 1/100 of a grid-square (ie. OS Grid reference values - precision associated with successive digits SW 726 182) is probably the most widespread and suited to many requirements. The Grid reference may include spaces between the separate parts, or may be written as a continuous string (depending on preference).Īs a result there is no single 'correct' way of writing a grid reference, although the 6-figure grid reference (eg. The number of digits (eastings+northings) can vary in length (generally between 4 and 10 digits) The 'eastings' value always has the same number of figures as the 'northings' value.īut some parts of the Grid reference are flexible, to allow them to be used in different ways: The Grid square identifier always consists of exactly two-letters Some parts of the Grid reference layout are always the same: Understanding a Grid Reference The three parts of a Grid Referenceīefore working with grid references, it is important to understand their format and be able to separate out the 3 parts that they contain: It is designed to encourage use and re-use of information freely and flexibly, with only a few conditions.1. The Open Government Licence (OGL) was developed by the Controller of Her Majesty's Stationery Office (HMSO) to enable information providers in the public sector to license the use and re-use of their information under a common open licence. The following attribution statement MUST be cited in your products and applications when using this information.Ĭontains public sector information licensed under the Open Government license v3 About the license ![]() THIS INFORMATION IS LICENSED UNDER THE CONDITIONS OF THE OPEN GOVERNMENT LICENCE found at: If you have an idea you'd like to contribute please log an issue.Īll contributions should be submitted via a pull request. To install this gem onto your local machine, run bundle exec rake install. You can also run bin/console for an interactive prompt that will allow you to experiment. Then, run bundle exec rake to run the tests. new ( input: in radians." DevelopmentĪfter checking out the repo, run bin/setup to install dependencies. for 'ST 58801 71043' location = GlobalConvert:: Location. Require 'global_convert' require 'os_map_ref' os_location = OsMapRef:: Location. ![]()
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