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Brazil Amazon: Drone to scan for ancient Amazonia
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Brazil Amazon: Drone to scan for ancient Amazonia
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Whitney
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Brazil Amazon: Drone to scan for ancient Amazonia
«
on:
February 16, 2015, 01:25:51 am »
Brazil Amazon: Drone to scan for ancient Amazonia
By Jonathan Amos BBC Science Correspondent, San Jose
Geoglyphs More than 450 geoglyphs have now been identified in deforested areas
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Whitney
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Re: Brazil Amazon: Drone to scan for ancient Amazonia
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February 16, 2015, 01:26:13 am »
cientists are to scan the Amazon forest in Brazil to look for evidence of occupation by ancient civilisations.
A drone will be sent up with a laser instrument to peer through the canopy for earthworks that were constructed thousands of years ago.
The UK-led project is trying to determine how big these communities were, and to what degree they altered the landscape.
The data is likely to inform policies on sustainable forest use today.
Researchers announced the initiative at the annual meeting of the American Association for the Advancement of Science in San Jose.
Prof Jose Iriarte: "The geoglyphs were found in places that were supposed to be pristine"
It has just won a 1.7m-euro (£1.25m; $1.9m) grant from the European Research Council.
The key quest is to try to understand the scale and activities of populations living in the late pre-Columbian period (the last 3,000 years before the Europeans arrived in the 1490s).
'Cultural parkland'
The international team will endeavour to find more geoglyphs, which are large geometric patterns left in the ground.
More than 450 of these are known in places where the forest has been cleared.
No-one is really quite sure what these earthen circles, squares and lines represent. Perhaps, they were ceremonial centres. But what is certain is that they are evidence of collective behaviour.
"It’s a hot debate right now in New World archaeology," said Dr Jose Iriarte from Exeter University, UK.
"While some researchers think that Amazonia was inhabited by small bands of hunter-gatherers and shifting cultivators who had a minimal impact on the environment, and that the forest we see today is pristine and untouched for thousands of years - mounting evidence is showing this may not be the case.
"This evidence suggests that Amazonia may have been inhabited by large, numerous, complex and hierarchical societies that had a major impact on the environment; what we call the 'cultural parkland hypothesis'," he told BBC News.
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Whitney
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Re: Brazil Amazon: Drone to scan for ancient Amazonia
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February 16, 2015, 01:26:37 am »
The drone to be used in the project has a wingspan of about 3m
Dr Iriarte's project will fly its robotic plane across sample areas of forest.
This vehicle's lidar instrument should reveal how many more geoglyphs remain hidden beneath still-canopied regions of Amazonia.
While some of the light from the lidar scatters back off the leaves, some is able to penetrate to the ground.
A smart algorithm can then be used to separate the two signals, digitally removing the trees to expose anything unusual beneath.
If candidate geoglyphs are confirmed in follow-up inspections, scientists would then move in to characterise signature changes that have been left in the soils and vegetation by the ancient inhabitants.
These "fingerprints" could then be searched for in satellite images, enabling a much broader swathe of Amazonia to be probed than is possible with just a small unmanned aerial vehicle. The arguments over the scale of occupation and its impacts should then be settled.
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Whitney
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Re: Brazil Amazon: Drone to scan for ancient Amazonia
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February 16, 2015, 01:27:03 am »
In normal airborne imagery only the tops of the trees are visible
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Whitney
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Re: Brazil Amazon: Drone to scan for ancient Amazonia
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February 16, 2015, 01:27:35 am »
The lidar makes a map of the canopy in digital form...
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Whitney
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Re: Brazil Amazon: Drone to scan for ancient Amazonia
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Reply #5
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February 16, 2015, 01:28:03 am »
...which can then be removed to leave only that signal of the laser that made it through to the ground
The project is a partnership between agencies and institutions in Europe and, of course, in Brazil.
The expectation is that lessons learned will feed into policies for the management and sustainable use of the Amazon and its resources.
Dr Iriarte said it was not possible to gauge properly what future changes would be acceptable unless there was a fuller understanding of how the forest had been altered in the past.
"We want to see what is the human footprint in the forest and then inform policy, because it may be the case that the very biodiversity that we want to preserve is the result of the past historical manipulation of this forest," he explained.
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Whitney
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Re: Brazil Amazon: Drone to scan for ancient Amazonia
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Reply #6
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February 16, 2015, 01:28:31 am »
How many more of the geoglyphs is the Amazon forest hiding from view
Jonathan.Amos-INTERNET@bbc.co.uk
an follow me on Twitter: @BBCAmos
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Whitney
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Re: Brazil Amazon: Drone to scan for ancient Amazonia
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Reply #7
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February 16, 2015, 01:28:51 am »
http://www.bbc.com/news/science-environment-31467619
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