A European team headed by CIRAD has shown that spatial remote sensing could be of use in analysing these types of areas, in such a context. Remote sensing, which has not previously been used to any extent in the region, can be used to observe wide and often inaccessible areas, repeatedly and objectively. The eventual aim is to inventory the situation across the whole of French Guiana, so as to enable decision-makers to make informed choices about development.
The team used two tools: a set of daily low-resolution data covering a full year, obtained using the VEGETATION sensor carried by the SPOT-4 satellite. The preliminary information derived from those data was used to define the main vegetation types and identify the landscape structure. The researchers then superimposed maps produced using high-resolution data obtained by the Landsat ETM+ and SPOT-HRVIR satellites, characterizing human impact.
By combining those data, the researchers were able to produce a map of vegetation type distribution. Three main soil cover families were identified: swamps, including mangroves and varzeas, humid riverside zones, and forests and savannahs. Three types of activity were detected within those areas. Forestry operations (felling and skidding) were identified from gaps in the forest. Gold panning, and more specifically sludge decantation ponds, was pinpointed from deforested areas. Lastly, agricultural activity in western French Guiana was assessed: infrastructures such as roads, tracks and forest trails were detected, as were farmed areas. Only regenerated forest areas escaped detection, depending on the degree of regeneration.
This technique has laid the technical foundations for planning and managing vast areas as efficiently as possible.
Valéry Gond | alfa
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University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
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Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
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Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
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Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
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