SQL function to convert UK OS coordinates from easting/northing to longitude and latitude

Question

Please can someone post a SQL function to convert easting/northing to longitude/latitude. I know it\'s incredibly complicated but I haven\'t found anyone who has documented it i

Answer 1

I have developed a library in .NET to be called from transact sql Converts WGS84/UTM coordinates to Latitude and Longitude

It does just the opposite, but as it uses CoordinateSharp you can download the code and change it easily to convert from lat/long to wgs84 instead.

You can download it from github:

https://github.com/j-v-garcia/UTM2LATITUDE

  usage:

    SELECT dbo.UTM2LATITUDE(723399.51,4373328.5,'S',30) AS Latitude, dbo.UTM2LONGITUDE(723399.51,4373328.5,'S',30) AS Longitude

    result: 

        39,4805657453054    -0,402592727245112

        pos UTM X
        pos UTM Y
        Latitude band grid zone designation letter (see http://www.dmap.co.uk/utmworld.htm) 
        Longitude band grid zone designation number (see http://www.dmap.co.uk/utmworld.htm)