Here are the details of maps for Shaftesbury:
This detailed map covers the hill-top town of Shaftesbury. Features include the town centre, Holy Trinity church, High Street, St James, Butts Knap, Hawksdean Lane, St Rumbold's church, workhouse, Breach Common, Alcester, Castle Hill, Gold Hill, Park Walk, Payne's Place. Also Bimport, which features in Thomas Hardy's Jude the Obscure, where Shaftesbury is referred to as Shaston. On the north side of town the map covers Enmore Green and Long Cross.
You might find this index map useful.