Historical Mapping

[geopast]

Is there a way to see which layers are historical? Could a date be added to the index perhaps?

[bhousel]

Yes, there are optional start_date and end_date properties on each source. These should be used for the dates that the imagery or map data was collected. iD considers only the end_date field when deciding if something is too historic to include - i.e. more than 20 years old.

e.g. OS Town Plans, Ayr 1855 (NLS)

Unfortunately not every historic source in this index has dates set..
e.g. NLS - OS 6-inch County Series, 1888-1913

[geopast]

Thanks Bryan!

From your knowledge, is there much historical layers (outside of UK and Ireland) available? By historical i mean at least 50 years ago.

Many thanks,
Neil

[bhousel]

quick and dirty search for anything with an 18xx or 19xx end date:

07:35 $ grep -r '\"end_date\":\s*\"1[8-9]' sources
sources/europe/gb/NLS-OSTownPlan-Aberdeen1866-1867.json:    "end_date": "1868",
sources/europe/gb/NLS-OSTownPlan-Airdrie1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Alexandria1859.json:    "end_date": "1860",
sources/europe/gb/NLS-OSTownPlan-Alloa1861-1862.json:    "end_date": "1863",
sources/europe/gb/NLS-OSTownPlan-Annan1859.json:    "end_date": "1860",
sources/europe/gb/NLS-OSTownPlan-Arbroath1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Ayr1855.json:    "end_date": "1856",
sources/europe/gb/NLS-OSTownPlan-Berwick-upon-Tweed1852.json:    "end_date": "1853",
sources/europe/gb/NLS-OSTownPlan-Brechin1862.json:    "end_date": "1863",
sources/europe/gb/NLS-OSTownPlan-Burntisland1894.json:    "end_date": "1895",
sources/europe/gb/NLS-OSTownPlan-Campbelton1865.json:    "end_date": "1866",
sources/europe/gb/NLS-OSTownPlan-Coatbridge1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Cupar1854.json:    "end_date": "1855",
sources/europe/gb/NLS-OSTownPlan-Cupar1893-1894.json:    "end_date": "1895",
sources/europe/gb/NLS-OSTownPlan-Dalkeith1852.json:    "end_date": "1853",
sources/europe/gb/NLS-OSTownPlan-Dalkeith1893.json:    "end_date": "1894",
sources/europe/gb/NLS-OSTownPlan-Dumbarton1859.json:    "end_date": "1860",
sources/europe/gb/NLS-OSTownPlan-Dumfries1850.json:    "end_date": "1851",
sources/europe/gb/NLS-OSTownPlan-Dumfries1893.json:    "end_date": "1894",
sources/europe/gb/NLS-OSTownPlan-Dundee1857-1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Dundee1870-1872.json:    "end_date": "1873",
sources/europe/gb/NLS-OSTownPlan-Dunfermline1854.json:    "end_date": "1855",
sources/europe/gb/NLS-OSTownPlan-Dunfermline1894.json:    "end_date": "1895",
sources/europe/gb/NLS-OSTownPlan-Edinburgh1849-1851.json:    "end_date": "1852",
sources/europe/gb/NLS-OSTownPlan-Edinburgh1876-1877.json:    "end_date": "1878",
sources/europe/gb/NLS-OSTownPlan-Edinburgh1893-1894.json:    "end_date": "1895",
sources/europe/gb/NLS-OSTownPlan-Elgin1868.json:    "end_date": "1869",
sources/europe/gb/NLS-OSTownPlan-Falkirk1858-1859.json:    "end_date": "1860",
sources/europe/gb/NLS-OSTownPlan-Forfar1860-1861.json:    "end_date": "1862",
sources/europe/gb/NLS-OSTownPlan-Forres1868.json:    "end_date": "1869",
sources/europe/gb/NLS-OSTownPlan-Galashiels1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Girvan1857.json:    "end_date": "1858",
sources/europe/gb/NLS-OSTownPlan-Glasgow1857-1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Glasgow1892-1894.json:    "end_date": "1895",
sources/europe/gb/NLS-OSTownPlan-Greenock1857.json:    "end_date": "1858",
sources/europe/gb/NLS-OSTownPlan-Haddington1853.json:    "end_date": "1854",
sources/europe/gb/NLS-OSTownPlan-Haddington1893.json:    "end_date": "1894",
sources/europe/gb/NLS-OSTownPlan-Hamilton1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Hawick1857-1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Inverness1867-1868.json:    "end_date": "1869",
sources/europe/gb/NLS-OSTownPlan-Irvine1859.json:    "end_date": "1860",
sources/europe/gb/NLS-OSTownPlan-Jedburgh1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Kelso1857.json:    "end_date": "1858",
sources/europe/gb/NLS-OSTownPlan-Kilmarnock1857-1859.json:    "end_date": "1860",
sources/europe/gb/NLS-OSTownPlan-Kirkcaldy1855.json:    "end_date": "1856",
sources/europe/gb/NLS-OSTownPlan-Kirkcaldy1894.json:    "end_date": "1895",
sources/europe/gb/NLS-OSTownPlan-Kirkcudbright1850.json:    "end_date": "1851",
sources/europe/gb/NLS-OSTownPlan-Kirkcudbright1893.json:    "end_date": "1894",
sources/europe/gb/NLS-OSTownPlan-Kirkintilloch1859.json:    "end_date": "1860",
sources/europe/gb/NLS-OSTownPlan-Kirriemuir1861.json:    "end_date": "1862",
sources/europe/gb/NLS-OSTownPlan-Lanark1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Linlithgow1856.json:    "end_date": "1857",
sources/europe/gb/NLS-OSTownPlan-Mayole1856-1857.json:    "end_date": "1858",
sources/europe/gb/NLS-OSTownPlan-Montrose1861-1862.json:    "end_date": "1863",
sources/europe/gb/NLS-OSTownPlan-Musselburgh1853.json:    "end_date": "1854",
sources/europe/gb/NLS-OSTownPlan-Musselburgh1893.json:    "end_date": "1894",
sources/europe/gb/NLS-OSTownPlan-Nairn1867-1868.json:    "end_date": "1869",
sources/europe/gb/NLS-OSTownPlan-Oban1867-1868.json:    "end_date": "1869",
sources/europe/gb/NLS-OSTownPlan-Paisley1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Peebles1856.json:    "end_date": "1857",
sources/europe/gb/NLS-OSTownPlan-Perth1860.json:    "end_date": "1861",
sources/europe/gb/NLS-OSTownPlan-Peterhead1868.json:    "end_date": "1869",
sources/europe/gb/NLS-OSTownPlan-Port_Glasgow1856-1857.json:    "end_date": "1858",
sources/europe/gb/NLS-OSTownPlan-Portobello1893-1894.json:    "end_date": "1895",
sources/europe/gb/NLS-OSTownPlan-Rothesay1862-1863.json:    "end_date": "1864",
sources/europe/gb/NLS-OSTownPlan-Selkirk1865.json:    "end_date": "1866",
sources/europe/gb/NLS-OSTownPlan-St_Andrews1854.json:    "end_date": "1855",
sources/europe/gb/NLS-OSTownPlan-St_Andrews1893.json:    "end_date": "1894",
sources/europe/gb/NLS-OSTownPlan-Stirling1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Stonehaven1864.json:    "end_date": "1865",
sources/europe/gb/NLS-OSTownPlan-Stranraer1847.json:    "end_date": "1848",
sources/europe/gb/NLS-OSTownPlan-Stranraer1863-1877.json:    "end_date": "1878",
sources/europe/gb/NLS-OSTownPlan-Stranraer1893.json:    "end_date": "1894",
sources/europe/gb/NLS-OSTownPlan-Strathaven1858.json:    "end_date": "1859",
sources/europe/gb/NLS-OSTownPlan-Wick1872.json:    "end_date": "1873",
sources/europe/gb/NLS-OSTownPlan-Wigtown1848.json:    "end_date": "1849",
sources/europe/gb/NLS-OSTownPlan-Wigtown1894.json:    "end_date": "1895",