The German radar satellites TerraSAR-X and TanDEM-X have now made the hidden Valley of the Kings visible in an impressive way. The two satellites orbit the Earth, only a few hundred metres apart, at an altitude of 514 kilometres. This means that they can record the same area on Earth at the same time. Using what is referred to as SAR interferometry, detailed elevation models of Earth can be created from the radar data acquired by the satellites. One of the two satellites transmits radar signals. The signal echoes reflected by Earth's surface are then received by both satellites from two different angles, similar to human stereoscopic vision. From the different path lengths of the signals from the ground to the satellites, the elevation of Earth's surface can be measured during the overflight. The DLR team used these data to create a digital elevation model of the Valley of the Kings. In flat areas, they also enhanced the backscatter from Earth's surface measured by the satellites to make cities, for example, more visible. The model was also colourised for a more vivid representation.
Rich detail through radar
The data from the radar satellites was used to create a Digital Elevation Model (DEM) of the Nile Valley at various magnification levels. The increased zoom levels reveal new structures and details of the mountainous region and the Nile Valley. The Valley of the Kings itself extends over a very small area of one square kilometre and only becomes clearly visible at the highest magnification level (Image 3). It lies to the west of the Nile, in the southern foothills of the highly fissured rock massif of the Theban Mountains. The highest point of the Theban Mountains is the pyramid shaped El Qurn (southernmost ridge in Image 3). At its end are the 64 burial chambers of the pharaohs - among them 'KV62' (King's Valley 62), the burial chamber of Tutankhamun. On the southern slope of El-Qurn is the Valley of the Queens and the magnificent burial temple of the ancient Egyptian queen Hatshepsut.
On the eastern side of the Nile lies the city of Luxor. It is clearly recognisable by the light-coloured structures in Images 2 and 3. In Tutankhamun's time, the city was called Thebes and was mainly used as the most important necropolis, that is, a city of the dead. Approximately in the centre, to the north of the bright centre of Luxor, directly on the Nile, is the Luxor Temple. At its northern end is Karnak, the largest temple complex in Egypt.
The last two pictures show high-resolution SAR images of the valley. In contrast to the digital elevation models, these were acquired using only one satellite. In the fourth image, both the Valley of the Kings and the city of Luxor can be seen. A further close-up in the fifth image shows the valley and the entrance area in detail. Due to the lateral-viewing geometry of the image, the valley appears very three-dimensional in the centre of the image.
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