Jump to the following:

By continuing, you agree to the use of cookies by us and third parties, which we use to improve your visit.

Alteration to Explorer Map 276

Request for information - Ref No: FOI17805

Request and our response

Thank you for your email of 2 January 2018, requesting information from Ordnance Survey in accordance with the Freedom of Information Act (FOIA) 2000.

I confirm that Ordnance Survey does hold some of the information you have requested. Where the information is not held or exempt from disclosure, this is stated.

Firstly, your FOI request includes the following two paragraphs by way of background.

The 2011 paper edition of the above map displays an area of Open Access Land near my home (xxxxxx). Despite the area remaining registered under the CRoW Act, the area is not displayed on the 2015 paper edition of the map. The 2015 paper map states that the 2011 map was revised in August 2011 - presumably later the same year that the 2011 map was published and offered for sale.

In addition, the online detail currently on display is not at all accurate, and only shows a very small area of woodland and a path only partially shown. In actuality, the whole 26 acres was planted with trees by the Forestry Commission, circa 2004, and a mile-long multi-user path circuits the woodland.

To clarify and further develop the above paragraphs, please note that CRoW Access land, in the area you refer to in your request, was first shown on our Explorer Map 276 in 2004, edition A1. The CRoW Access land designation for this area was removed from our digital data (from which elements of the Explorer Map are derived) in June 2014, and therefore the CRoW Access land was no longer shown on Explorer Map 276 (paper map) when it was reprinted as part of the OS rebrand in 2015 (not in 2011, as stated in your FOI request). I can confirm that the latest available data from the Forestry Commission shows the relevant area as still being CRoW Access land.

In relation to OS Maps (online mapping), the 1:25 000 data (which is viewed via the OS Leisure Maps layer) correctly depicts the area you refer to as Woodland and Access Land. We are currently in the process of updating the 1:10,000 data in terms of the woodland and the footpath, and this should be completed by the end of April 2018 (please note 1:10,000 mapping does not depict CRoW Access land, as this is outside of the product’s specification). Ordnance Survey will also ensure these updates will be shown on Explorer Map 276 (paper map) when it is next due for revision; please note we currently do not have a scheduled revision date for Explorer Map 276.

Taking each of your six requests for information in turn, I confirm the following:

1. What is the official procedure followed when any paper or online map is amended and who can give instructions regarding Open Access Land?
Whilst this does not appear to be a valid request for information held in a recorded form, we are happy to provide the following information in accordance with our duty under section 16 of the FOIA to provide advice and assistance.

There are various procedures in place for updates to our products depending on the product and the change; some updates to our products are derived from our large-scale database that is used to create the OS MasterMap Topography layer, whilst other products which are not derived from the large-scale database have their own procedures in place for updates.

Information to update our mapping is obtained through a variety of sources including aerial photography, ground visits by a surveyor, or supplied via a third party. When any paper or online map is updated we comply with the relevant specification for update.

In relation to Ordnance Survey’s large-scale mapping this is either updated on a cyclic revision basis or continuous revision basis depending on the scale. You may wish to refer to our website for further information, in particular, the OS MasterMap Topography Layer support page, and go to ‘How often is the OS MasterMap Topography Layer updated’; this also provides a link to the Revision Policy.

You can also find user information on the revision policies for various of our other products in our product finder.

Our paper map products are updated by releasing revised editions. The periods between releases of new editions varies and sheets are selected for revision based on factors such as the amount and nature of change that has accumulated on the source 1:25 000 and 1:50 000 data sets, and the volume of stock remaining of the map sheet.

In relation to who can give instructions regarding Open Access Land, Ordnance Survey review Forestry Commission data on an 18- to 24-month cycle. The available data is downloaded from the Forestry Commission website, and our mapping is updated accordingly. If any areas are highlighted for change in between this time period, this will be investigated on an ad-hoc basis and applied to the source 1:25 000 data set during the revision process.

2. What checks are made to ensure the changes are accurate?
Whilst this does not appear to be a valid request for information held in a recorded form, we are happy to provide the following information in accordance with our duty under section 16 of the FOIA to provide advice and assistance.

A quality assurance procedure is in place for all our products. This involves the data being checked using a scale specific checklist, i.e. the quality control and quality assurance teams will have a number of items to double check depending on the changes made and the product they are checking.

In relation to the quality assurance checks in place for our paper maps, all work is first quality controlled within the production area. Quality Control is undertaken by individuals not directly involved in the update of the maps to be assessed. Quality Controllers review all the updates to the content both in terms of depiction and positional accuracy. They also review that the key sources of change have been input appropriately, for example Rights of Way and Open Access Land and change intelligence emanating from our large-scale data production. A further and final step of assurance is undertaken before map sheet production can begin. Operating outside of the production area entirely, an individual will review changed content to be submitted for print production.

3. Copies of information from any source which explains why the area of Open Access Land is not shown on the 2015 paper edition.
I can confirm Ordnance Survey does not hold this information.

Ordnance Survey does not hold information relating to why the depiction of the Access land was deleted from Explorer Map 276 in 2015; we do not hold an archive of why changes such as deletions of features are made. However, since the latest available data from the Forestry Commission shows the relevant area as still being CRoW Access land, we assume that the deletion of the CRoW depiction was made in error.

4. Details of when and by whom this particular change was requested and confirmation that proper procedure was followed.
I can confirm Ordnance Survey does not hold this information; please see our response to question 3 above.

5. The 'cut-off date' for the publication of the 2011 edition of the paper map.
I can confirm Ordnance Survey does not hold this information.

6. The number of copies of the 2015 paper edition both offered for sale and sold.
I can confirm Ordnance Survey has sold (directly or through our distributors) a total of 2,781 units of Explorer map 276 (standard and the Active variant) since September 2015 up to 4 January 2018.

7. How the drilled down detail on the online map was determined and what checks were made re the accuracy of the details.
Whilst this does not appear to be a valid request for information held in a recorded form, we are happy to provide the following information in accordance with our duty under section 16 of the FOIA to provide advice and assistance.

The data displayed on OS Maps (online maps) is compiled from different data sources at each “zoom level” at which it is viewed. Each of those data sources has quality control procedures applied to ensure that changes have been correctly applied; once the updated mapping is added online into OS Maps, no further checks are made.

Internal review

Your enquiry has been processed according to the Freedom of Information Act (FOIA) 2000. If you are unhappy with our response, you may request an internal review with our Internal Review Officer by contacting them, within two months of receipt of our final response to your FOI request, as follows:

Internal Review Officer
Customer Service Centre
Ordnance Survey
Adanac Drive
Southampton
SO16 0AS

Email: foi@os.uk

Please include the reference number above. You may request an internal review where you believe Ordnance Survey has:

  • Failed to respond to your request within the time limits (normally 20 working days)
  • Failed to tell you whether or not we hold the information
  • Failed to provide the information you have requested
  • Failed to explain the reasons for refusing a request
  • Failed to correctly apply an exemption or exception

The Internal Review Officer will not have been involved in the original decision. They will conduct an independent internal review and will inform you of the outcome of the review normally within 20 working days, but exceptionally within 40 working days, in line with the Information Commissioner’s guidance.

The Internal Review Officer will either: uphold the original decision, provide an additional explanation of the exemption/s applied or release further information, if it is considered appropriate to do so.

Appeal to Information Commissioner's Office (ICO)
If, following the outcome of the internal review you remain unhappy with our response, you may raise an appeal, within three months of receiving our response, with the Information Commissioner’s Office.

Further information can be found on the ICO website (ico.org.uk) under ‘Report a concern’ or you may wish to call the ICO helpline on 0303 123 1113.

Thank you for your enquiry.

Search Freedom of Information requests

Back to top
© Ordnance Survey 2016