File:Line of sight to Plynlimon - geograph.org.uk - 963435.jpg
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Line_of_sight_to_Plynlimon_-_geograph.org.uk_-_963435.jpg (640 × 480 pixels, file size: 206 KB, MIME type: image/jpeg)
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[edit]DescriptionLine of sight to Plynlimon - geograph.org.uk - 963435.jpg |
English: Line of sight to Plynlimon A 'surveyors eye view' from the secondary trig point at Banc y Garn, looking towards the primary triangulation station on Plynlimon which is some 5½ miles away.
When carrying out triangulation work, many observations were made at night with a light illuminating the target station. From 1957, the micro-wave radio distance measuring "Tellurometer" was introduced for recording distances between stations. At this location, the surrounding forestry doesn't quite obscure the view of Plynlimon but it was often the case that no line of sight was available from ground stations because of the growth of forestry or because of other obstructions. In this situation, portable steel towers were constructed over the ground station. Observations from towers had their own problems. The towers flexed in even moderate winds so observations could not be carried out in windy conditions. In hot weather, the steel expanded and this could affect the observed results so the work was done as quickly as possible to minimise errors. |
Date | |
Source | From geograph.org.uk |
Author | OLU |
Camera location | 52° 26′ 32″ N, 3° 54′ 14″ W ![]() ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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Object location | 52° 26′ 32″ N, 3° 54′ 12″ W ![]() ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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This image was taken from the Geograph project collection. See this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by OLU and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
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Attribution: OLU
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:12, 22 February 2011 | ![]() | 640 × 480 (206 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=Line of sight to Plynlimon A 'surveyors eye view' from the secondary trig point at Banc y Garn, looking towards the primary triangulation station on Plynlimon which is some 5½ miles away. When |
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Camera manufacturer | SONY |
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Camera model | DSC-H1 |
Exposure time | 1/400 sec (0.0025) |
F-number | f/4 |
ISO speed rating | 64 |
Date and time of data generation | 16:52, 13 September 2008 |
Lens focal length | 6 mm |
Orientation | 0 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Picasa 3.0 |
File change date and time | 16:52, 13 September 2008 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 16:52, 13 September 2008 |
Image compression mode | 8 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Color space | Uncalibrated |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Unique image ID | b88e9db09b62f55533975bbda2b74bf2 |