File:Sunset on a Qatari dune.JPG
Original file (4,896 × 3,672 pixels, file size: 6.09 MB, MIME type: image/jpeg)
Captions
Summary[edit]
DescriptionSunset on a Qatari dune.JPG |
English: Ground Penetrating Radar experiments to map out the internal structure of this 30m barchan desert dune.
This picture was taking as part of a 5-day field campaign to several dry desert sand dunes in Qatar, forming part of a collaboration with colleages from the UK, US and Qatar. We conducted a survey with a 1200 MHz Ground Penetrating Radar system on the steep (angle = 30 degrees) slope of a large barchan dune. The sand on this slope is piled up due to subsequent avalanches, originating from the crest of the dune as the wind blows fiercely. Cables are running down the dune from the flag on the top-right in the image to the batteries at the bottom-left. The PhD-student navigates the radar slowly downhill as it collects our data. The resulting data reveal the fine structure of the layers of sand that are hidden beneath the surface. Due to ideal conditions, we are able to "see" to a depth of ~5 meters, with an resolution of between 5 - 10 cm. To our knowledge, no-one has ever performed such a high-resolution GPR survey before on dry desert dunes. |
Date | |
Source | Own work |
Author | Nmvriend |
Camera location | 25° 00′ 43.78″ N, 51° 19′ 57.35″ E | View this and other nearby images on: OpenStreetMap | 25.012161; 51.332597 |
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This image was uploaded as part of European Science Photo Competition 2015. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:16, 29 November 2015 | 4,896 × 3,672 (6.09 MB) | Nmvriend (talk | contribs) | User created page with UploadWizard |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | Panasonic |
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Camera model | DMC-TZ40 |
Exposure time | 1/160 sec (0.00625) |
F-number | f/3.3 |
ISO speed rating | 100 |
Date and time of data generation | 13:52, 15 January 2015 |
Lens focal length | 4.3 mm |
Latitude | 25° 0′ 43.78″ N |
Longitude | 51° 19′ 57.35″ E |
Altitude | 0 meters above sea level |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Ver.1.0 |
File change date and time | 13:53, 15 January 2015 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.3 |
Date and time of digitizing | 13:52, 15 January 2015 |
Meaning of each component |
|
Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 3.4453125 APEX (f/3.3) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 24 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
GPS time (atomic clock) | 13:52 |
Receiver status | Measurement in progress |
Measurement mode | 2-dimensional measurement |
Measurement precision | Excellent (0) |
Reference for direction of image | Magnetic direction |
Direction of image | 292.5 |
Geodetic survey data used | WGS-84 |
GPS date | 20 January 2015 |
GPS tag version | 0.0.3.2 |