Free Ord­nance Sur­vey maps on­line

Who Do You Think You Are? Magazine - - ON THE RECORD -

A pro­ject to make a highly de­tailed set of Ord­nance Sur­vey maps avail­able to web users has hit a new mile­stone.

The Na­tional Li­brary of Scot­land (NLS) first be­gan adding 25-inch-tothe-mile maps to its web­site in March 2015, cov­er­ing Lon­don and coun­ties in south-east Eng­land.

How­ever, the re­source now ex­tends across to the West Coun­try, tak­ing in the ad­di­tional coun­ties of Berk­shire, Corn­wall, Devon, Dorset, Hamp­shire, Hert­ford­shire, Mid­dle­sex, and Ox­ford­shire.

Dat­ing from the 1890s to the 1920s, the digi­tised maps have also been ‘geo­ref­er­enced’, mean­ing it is pos­si­ble to view them as a trans­par­ent layer on top of mod­ern satel­lite im­agery.

“The 25-inch maps are im­mensely valu­able for fam­ily and lo­cal his­tory, al­low­ing prac­ti­cally all nat­u­ral and man-made fea­tures to be seen with clar­ity,” said NLS se­nior maps cu­ra­tor Chris Fleet. “The maps are also the most de­tailed Ord­nance Sur­vey scale to cover vir­tu­ally all of Eng­land and Wales – only larger towns were mapped in greater de­tail – and so they be­came used for a very wide range of pur­poses.”

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