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Additional coordinates

Request for information – FOI13405

Thank you for your e-mail, of 8 August 2013, which we acknowledge and have assigned the new reference of FOI13405.

Ordnance Survey does hold some the information to respond to this information request, which relates to information we have previously supplied under FOI13394, and we respond to each of your points as follows:

1. Attached is a modified version of your screen shot of the area (omitted from this response). I have assumed that the red points on the 4 to B lines and elsewhere are points where direct GPS readings were taken. If so, I have marked in purple, 10a and 10b whose readings would also be needed.

Yes, this is correct. Points 1 to 6 on the original 'coords.bmp' are 'direct GPS readings'.

10a X and Y coordinates 17741.97 703358.54 and Z value 183.09

10b X and Y coordinates 317743.49 703357.22 and Z value 183.14

2. I note the D to A/G line (extended to A/G) has no direct reading points although the deeds specify dimensions related to A/G. Is this correct? If not, may I please have the readings that were taken on this line, or the coordinates as read from your drawing.

The line to which you refer as D to A/G has one 'direct GPS reading' (control point) approximately 2.4 metres from the north end of the line. The X and Y coordinates of this control point are 317819.98 703369.01 and Z value 197.31.

The other points labeled by you on this line have no direct GPS readings. The coordinates taken on screen are:

Point G/F 317785, 703349
Point F 317779, 703346

The coordinates taken on screen for the Southern end of line D to A/G (not the extended part drawn on by you) are 317768, 703340.

Please note that whilst control point features are frequently coincidental with topographic detail that meets our specification, control point features (point 10a for example) may, exist in isolation, and may be purely reference points.

3. The accuracy tolerance quoted seems exorbitant. Is this the figure that is required by the Registers of Scotland that is specified by the manufacturers of the GPS system?

We have previously supplied our general accuracy in relation to the expected accuracy of the data for this type of geography i.e. developed rural areas or smaller urban areas. In some areas the accuracy will be better and individual surveys may well be better than the quoted figure.

Under the duty to provide advice and assistance, section 16 of the FOIA, we can advise that although we use modern high-accuracy equipment to support our data capture, we are revising mapping that was produced using less reliable techniques. We have to make compromises when fitting new surveys to the existing mapping; hence the generous tolerances for relative accuracies.

We can advise that The Registers of Scotland are aware of the expected accuracy levels for Ordnance Survey large scale mapping. We cannot comment on the accuracy of independent GPS systems manufacturers.

As all the requested information that is held has been provided, we have determined that in all the circumstances of this case the Public interest consideration (section 17 FOIA) is not applicable in this instance.

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 FOI Internal Review Officer, by contacting them as follows:

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

E-mail: foi@ordnancesurvey.co.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 FOI 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 FOI 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 with the Information Commissioner’s Office at:

The Case Reception Unit
Customer Service Team
The Information Commissioner’s Office
Wycliffe House
Water Lane

E-mail: mail@ico.gsi.gov.uk

Telephone helpline: 0303 123 1113 or 01625 545745 for advice, Monday to Friday.

Thank you for your enquiry.

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