These two SAR images of the coastline of Dubai in the United Arab Emirates were acquired by ERS-2 on 20 May 1999 and Envisat on 21 April 2003. The latter image shows the Palm Jumeirah development under construction.
The rapidly changing face of Dubai in the United Arab Emirates is portrayed by contrasting Synthetic Aperture Radar (SAR) images taken less than four years apart, most notably as a whole new artificial island is seen to rise from the seabed.
An initial radar image of Dubai was taken by ERS-2’s SAR instrument in May 1999. The coastal city has since been re-imaged by the Advanced Synthetic Aperture Radar (ASAR) instrument aboard Envisat, ESA’s latest Earth Observation satellite. Unlike optical imagery, SAR images work by mapping surface roughness, based on the strength of radar backscatter reflected back up to space.
The increased white areas in the Envisat ASAR image compared to the ERS-2 image from 1999 - caused by radar reflecting strongly off building surfaces – are evidence of changes as mass construction programmes continue to develop the city.
Frédéric Le Gall | ESA
Multi-year submarine-canyon study challenges textbook theories about turbidity currents
12.12.2017 | Monterey Bay Aquarium Research Institute
How do megacities impact coastal seas? Searching for evidence in Chinese marginal seas
11.12.2017 | Leibniz-Institut für Ostseeforschung Warnemünde
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
14.12.2017 | Health and Medicine
14.12.2017 | Physics and Astronomy
14.12.2017 | Life Sciences