Launched on 22 October 2001, Proba orbits 600 kilometres above the Earth and acquires around 450 scientific image datasets of more than 100 separate sites each year. Its main payload, the Compact High Resolution Imaging Spectrometer (CHRIS), is a highly configurable hyperspectral imager that sees down to a resolution of 17 metres and can acquire up to five images of a desired target at a time, each at a different angle with respect to Earth's surface, because Proba is manoeuvrable enough to perform controlled pitch and roll.
This unique instrument was highlighted at the 4th Proba/CHRIS workshop held at ESRIN, ESA's Earth Observation Centre in Frascati, Italy, from 19 to 21 September 2006, where some 60 researchers from around the world met to share current results and future plans, and have an input into future CHRIS acquisition planning.
The workshop heard how CHRIS images are being used to assess the effects of different land use strategies on vegetation types in the savannahs in Central Nambia, to evaluate aerosol retrieval in Hong Kong, to identify ancient Roman buildings, to help map and measure alpine snow cover in the Swiss National Park, to monitor waste landfill operations, and to study the role of woodland as both sinks and sources of carbon dioxide, among many others.
The themes of the workshop included CHRIS image processing and validation, land-surface processes and the atmosphere, and inland and coastal waters. In addition to hearing encouraging results presented on diverse sets of scientific and application studies, the workshop highlighted the need to continue the Proba mission until new hyperspectral missions become available.
CHRIS, which is roughly the size of a large television set, is especially useful because of its combined ability to retrieve hyperspectral and multi-angular data. The imager's combination of high spatial resolution and wide spectral range means that a large amount of important biophysical and biochemical properties can be gathered, including chlorophyll and water content, leaf area index and overall biomass and vegetation health. It is also useful for studying the atmosphere and bodies of water.
Mike Barnsley of the University Swansea in the UK said that although upcoming missions will offer hyperspectral capabilities, "the multi-angle acquisition capacity of Proba/CHRIS remains unsurpassed by any other equivalent mission. What the scientific community requires now is a CHRIS-2 instrument, perhaps with extended spectral on a future Proba satellite to build upon the stunning successes of the original mission."
Participants also focused on the CHRIS/Proba mission helping to develop a new scientific community exploring applications of hyperspectral and multi-angle image data and on the growing knowledge base stemming from the mission, which is leading to a more coherent terrestrial science community that could provide informed advice on future satellite missions.
The need to better promote the advantages of the mission to a still wider scientific audience, since the CHRIS/Proba community is relatively small and select, was also highlighted at the workshop. To this end, Proba Scientific Investigators are invited to submit their contributions to the 2007 Envisat Symposium being held from 23 to 27 April 2007 in Montreux, Switzerland, where dedicated sessions will be organised.
In closing comments, the Proba community expressed hope that the spacecraft would last well beyond its 5-year anniversary next month in order to keep the science going until new missions with similar capabilities arrive.
Mariangela D'Acunto | alfa
Waste in the water – New purification techniques for healthier aquatic ecosystems
24.07.2018 | Eberhard Karls Universität Tübingen
Plenty of habitat for bears in Europe
24.07.2018 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
There are currently great hopes for solid-state batteries. They contain no liquid parts that could leak or catch fire. For this reason, they do not require cooling and are considered to be much safer, more reliable, and longer lasting than traditional lithium-ion batteries. Jülich scientists have now introduced a new concept that allows currents up to ten times greater during charging and discharging than previously described in the literature. The improvement was achieved by a “clever” choice of materials with a focus on consistently good compatibility. All components were made from phosphate compounds, which are well matched both chemically and mechanically.
The low current is considered one of the biggest hurdles in the development of solid-state batteries. It is the reason why the batteries take a relatively long...
New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference
Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...
Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
17.08.2018 | Event News
08.08.2018 | Event News
27.07.2018 | Event News
21.08.2018 | Power and Electrical Engineering
21.08.2018 | Life Sciences
21.08.2018 | Medical Engineering