Request for information – FOI144450
This enquiry concerns The Somerset Levels, the subject of current concern and interest.
Could you please tell me when the last aerial photograph was taken of The Levels, an area covering Bridgwater and the countryside to the North extending to the Bristol Channel and, particularly, to the South-East of Bridgwater?
It would be really helpful, also, to know the altitude from which any photograph was taken, and whether copies of any material are available.
Thank you for your e-mail of 29 January 2014, which we acknowledge, requesting information from Ordnance Survey in accordance with the Freedom of Information Act (FOIA) 2000.
Ordnance Survey does hold aerial photography from Bridgwater town centre captured on 16 July 2008. There is a small area of imagery that only covers the extent of the town, but if you can be more specific on the area of interest, with perhaps post code or national grid coordinates, we could check to see if this imagery extends to your area of interest. Upon receipt of further location information, we will consider providing this imagery to you under the Freedom of Information Act.
Under Section 16 of the FOIA ‘the duty to provide advice and assistance’ Ordnance Survey does hold orthorectified imagery tiles of 1km square which is created using National Grid control points and a digital terrain model (DTM). This means that the distortions inherent in a flat photograph of a three-dimensional object (the earth's surface) are more completely and accurately corrected. An orthorectified image is positionally more accurate, and geometric fidelity (shape) is retained in all terrain, including hilly areas. Also, a consistent scale is maintained throughout the image (as per a map), and future imagery updates will be in the same position
The most recent orthorectified imagery of central Bridgwater was captured on 7 March 2010. As advised above, the general area you have detailed as being of interest is vast, and our search has therefore focused and provided information from central Bridgwater.
Copies of orthorectified tiles, supplied with metadata which does stipulate the altitude, are available for purchase from our OS Mastermap® Imagery Layer product. Further information about OS Mastermap Imagery Layer can be found on our imagery layer web page.
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:
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