Ordnance Survey – Great Britain's national mapping agency
![Ordnance Survey home page [logo]](/images/gui/logo-os.gif){kind=logo}
The list below shows our current and future schedules of extraction and availability dates for OS MasterMap layers. We aim to keep these schedules up to date, but you should treat these dates as a guide only.
When you request change-only update (COU) data, to ensure there are no temporal gaps in your holdings, it is important that you enter the extraction date in the 'change since' window on the online service and not the availability date or the date that you last placed an order.
You can find extraction dates in the table below and also on your CD or DVD label (Note: On Full Supply CD/DVD label this is shown as the ‘currency’ date.) or, for FTP orders, in the (order number)_details.txt file from your FTP download. If your last order was a COU order was delivered on media then your CD/DVD labels says COU from xxx to xxx, then the extraction date is the latter of these two dates.
|
Layers |
Extraction date (Use this date for ordering COU) |
Available to customers (For information) |
|
Topography, Address, Address 2 & ITN |
28 October 2008 |
31 October 2008 |
|
Topography, Address, Address 2 & ITN |
16 September 2008 |
19 September 2008 |
|
Topography, Address, Address 2 & ITN |
22 July 2008 |
5 August 2008 |
|
Topography, Address, Address 2 & ITN |
12 June 2008 |
27 June 2008 |
|
Topography, Address, Address 2 & ITN |
7 May 2008 |
19 May 2008 |
|
Topography, Address, Address 2 & ITN |
19 March 2008 |
7 April 2008 |
|
Topography, Address, Address 2 & ITN |
7 February 2008 |
25 February 2008 |
|
Topography, Address, Address 2 & ITN |
20 December 2007 |
14 January 2008 |
|
Layers |
Extraction date |
Planned availability dates (between) |
|
Topography, Address, Address 2 & ITN |
TBC |
*12 - 15 December 2008 |
|
Topography, Address, Address 2 & ITN |
TBC |
*23 - 26 January 2009 |
*These dates are for guidance only and could be subject to change.
Updated 31/10/08
Extraction date: The date that our OS MasterMap database has been updated.
Availability date: The first date that this data is available for ordering.
What date should I use when ordering COU?
Past extraction and availabililty dates
