Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Citizen scientists map global forests

30.03.2015

New global forest maps combine citizen science with multiple data sources, for an unprecedented level of accuracy about the location and extent of forestland worldwide.

New maps of global forest cover from IIASA’s Geo-Wiki team provide a more accurate view of global forests. The maps were published in the journal Remote Sensing of the Environment, and are freely available for exploration and download on the Geo-Wiki Web site.


A view of South America's forest cover from the new hybrid global forest map, viewed via the Geo-Wiki platform

IIASA/Geo-wiki/Google Earth


A second version of the map was calibrated using regional and country-level forest statistics from the Food and Agriculture Organization, making it more useful for economic modeling

IIASA/Geo-Wiki/Google Earth

While there are many existing sources of data about forests, including satellite imagery, there is broad disagreement between the data products. Knowing the location and extent of forests is vital information for ecology, climate change, and economic modelling, as well as for researchers looking for the best reference information to estimate deforestation and forest degradation.

“The new maps rely on a combination of recent multisensory remote sensing data, statistics, and crowdsourcing,” says Dmitry Schepaschenko, the lead author of the study. “By combining different data sources, and incorporating the input of trained citizen scientists, we were able to produce new maps that are more accurate than any existing data source.”

The study introduces two global forest maps, both at 1-kilometer resolution, which provide a good compromise between the level of detail and global coverage. The first, which the researchers call the “best-guess” map, uses 8 different data sources and relied on a network of citizen scientists to check or validate the classification of land cover, by looking at high-resolution satellite imagery of different locations. Compared to existing data products, the researchers found, the new hybrid map was more accurate both for forest location and estimation of percentage forest cover.

The second map was further calibrated using regional and country-level forest statistics from the Food and Agriculture Organization (FAO). Schepaschenko explains that this makes the map more useful for economic modeling, and notes that such data are also used as inputs to international climate negotiations.

This also represents the first forest map that is consistent with FAO statistics and is freely available. A comparison of the two maps (i.e. the “best guess” and the calibrated one) highlights the countries where there are discrepancies and hence raises questions about reporting.

The new maps were produced for the year 2000 as a base year for modeling. The team also plans to update them with data for 2010 in the near future.

The new maps will be useful not only for research, but also for policymakers who rely on forest data for planning and decision making purposes. For example, past research has shown that estimates of the efforts required to reach the European Union’s biofuel target vary widely depending on which forest map was selected as an input.

The new maps complement another set of global cropland and land cover maps from the Geo-Wiki team and network, which were published earlier this year. “These new maps just go to show that regular people, in their free time, can contribute to top quality research,” says Schepaschenko.

IIASA researcher and study co-author Linda See adds “Geo-Wiki and our network of volunteers continue to help us improve land cover and develop robust products for the modelling and policy communities.”

Reference
Schepaschenko D., et al. (2015). Development of a global hybrid forest mask through the synergy of remote sensing, crowdsourcing and FAO statistics. Remote Sensing of Environment 162 (2015) 208–220 http://dx.doi.org/10.1016/j.rse.2015.02.011

Weitere Informationen:

http://www.iiasa.ac.at/web/home/about/news/150330-ForestMap.html
http://www.geo-wiki.org

MSc Katherine Leitzell | idw - Informationsdienst Wissenschaft

More articles from Earth Sciences:

nachricht NASA eyes Pineapple Express soaking California
24.02.2017 | NASA/Goddard Space Flight Center

nachricht 'Quartz' crystals at the Earth's core power its magnetic field
23.02.2017 | Tokyo Institute of Technology

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Safe glide at total engine failure with ELA-inside

On January 15, 2009, Chesley B. Sullenberger was celebrated world-wide: after the two engines had failed due to bird strike, he and his flight crew succeeded after a glide flight with an Airbus A320 in ditching on the Hudson River. All 155 people on board were saved.

On January 15, 2009, Chesley B. Sullenberger was celebrated world-wide: after the two engines had failed due to bird strike, he and his flight crew succeeded...

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

New pop-up strategy inspired by cuts, not folds

27.02.2017 | Materials Sciences

Sandia uses confined nanoparticles to improve hydrogen storage materials performance

27.02.2017 | Interdisciplinary Research

Decoding the genome's cryptic language

27.02.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>