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Wirral Part 4 - National Museums Liverpool

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Appendix 3 Digital Mapping<br />

Ordnance Survey map sources<br />

List of Date ranges and specific dates (shown brackets) allocated to each polygon<br />

according the date range of the mapping:<br />

Knowsley, <strong>Liverpool</strong>, Sefton, St Helens:<br />

Lancashire Ordnance Survey 6" First Edition 1850<br />

Lancashire Ordnance Survey 25" (Epoch 2) 1890-93 (1893)<br />

Lancashire Ordnance Survey 25" (Epoch 4), 1936-39 (1939)<br />

Ordnance Survey 10,000 Digital Raster Current (2003)<br />

<strong>Wirral</strong>:<br />

Cheshire Ordnance Survey 25" (Epoch 1), 1874-6 (1876)<br />

Cheshire Ordnance Survey 25" (Epoch 2), 1899 (1899)<br />

Cheshire Ordnance Survey 25" (Epoch 3), 1935-36 (1936)<br />

Ordnance Survey 10,000 Digital Raster Current (2003)<br />

Outside of the four set historic periods, maps from 'fill-in' dates were employed to<br />

enhance the historic visibility and detail of some areas where the set OS Epoch<br />

mapping was found to be incomplete.<br />

For Knowsley, <strong>Liverpool</strong>, Sefton, St Helens, these 'fill-in' maps were: the Lancashire<br />

Ordnance Survey 25" (Epoch 2) of 1907-08 (1908) and the Ordnance Survey 25"<br />

(Epoch 3) of 1927 (1927).<br />

For <strong>Wirral</strong>, the 'fill-in' maps were the Cheshire Ordnance Survey 6 " (Epoch 1) of 1892<br />

(1892) and the Ordnance Survey 25" (Epoch 3) of 1911-12 (1912).<br />

Ordnance Survey 1:10,000 Raster Mapping (2003)<br />

1:2,500 Landline (2003) used to check detail not data capture<br />

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