Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Spanish scientists design a procedure for detecting shadows in satellite images

02.06.2008
Scientists from the University of Malaga have devised a procedure for accurately identifying shadows in high-resolution images captured by satellites, making it possible to obtain more precise information on streets, buildings, vehicles, crops and other elements detected from space.

The results of this research have been passed to a company in the Parque Tecnológico de Andalucía (Andalusia Technology Park) which is already applying them in satellite image processing and detection of urban changes.

The Professor of the IT Engineering School at the University of Malaga and co-author of the study, Vicente Arévalo, explained to SINC that high-resolution images provided by current satellites and planes “have opened a new era in the field of teledetection, and that resolution enhancement also means that shadows, something inherent in any image, take on special significance”.

For example, shadows fall on buildings, cars or street furniture, the researcher commented, and in an aerial photograph “it is very important to detect what is or is not a shadow to correctly identify the elements that appear in it”.

Arévalo pointed out that the identification of shadows enables the subsequent application of specific information recovery techniques, as well as the preparation of three-dimensional designs. Thanks to the shadows, IT engineers can estimate, amongst other parameters, the height of elements in a landscape, such as a house.

To carry out this study, researchers have used images captured by the QuickBird satellite, also used for capturing aerial photographs of the Google Earth virtual atlas. Images obtained with this satellite have a 60 cm/pixel resolution, i.e. 60 cm of the real terrain captured in a pixel (the smallest unit comprising a digital image, defined by its brightness and colour). Once the image has been taken, its colour components are analysed and the so-called “seeds”, small groups of pixels that have a greater probability of being shadows, are identified through circles. To these “seeds” other surrounding pixels are added which are significant statistically for detecting the shadowy areas of the photo as accurately as possible in a process in which other tools such as edge detectors are also used.

The method developed by Andalusian researchers has been successfully tested in images obtained under different lighting conditions, in both urban and rural areas. For example, in a field of olive trees, it is easy to quantify the trees and see their size more accurately if shadows are properly identified in the high resolution images.

However, scientists’ main line of work is to detect urban changes, seeing how certain areas of cities change over time. Their studies make it possible to detect things ranging from earth movements or changes in the area to discovering whether anyone has built a swimming pool on their land. “We do not judge the legality of these types of actions”, Arévalo said, but the high resolution images of areas do help the work of surveyors.

SINC Team | alfa
Further information:
http://www.plataformasinc.es

More articles from Information Technology:

nachricht Cloud technology: Dynamic certificates make cloud service providers more secure
15.01.2018 | Technische Universität München

nachricht New discovery could improve brain-like memory and computing
10.01.2018 | University of Minnesota

All articles from Information Technology >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

Im Focus: A thermometer for the oceans

Measurement of noble gases in Antarctic ice cores

The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Gran Chaco: Biodiversity at High Risk

17.01.2018 | Ecology, The Environment and Conservation

Only an atom thick: Physicists succeed in measuring mechanical properties of 2D monolayer materials

17.01.2018 | Physics and Astronomy

Fraunhofer HHI receives AIS Technology Innovation Award 2018 for 3D Human Body Reconstruction

17.01.2018 | Awards Funding

VideoLinks
B2B-VideoLinks
More VideoLinks >>>