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 Wintertime Arctic sea ice growth slows long-term decline: NASA
07.12.2018 | NASA/Goddard Space Flight Center

nachricht Why Tehran Is Sinking Dangerously
06.12.2018 | Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Lethal combination: Drug cocktail turns off the juice to cancer cells

A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.

The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...

Im Focus: New Foldable Drone Flies through Narrow Holes in Rescue Missions

A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.

Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...

Im Focus: Topological material switched off and on for the first time

Key advance for future topological transistors

Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...

Im Focus: Researchers develop method to transfer entire 2D circuits to any smooth surface

What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.

Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...

Im Focus: Three components on one chip

Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.

Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

ICTM Conference 2019: Digitization emerges as an engineering trend for turbomachinery construction

12.12.2018 | Event News

New Plastics Economy Investor Forum - Meeting Point for Innovations

10.12.2018 | Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

 
Latest News

New discoveries predict ability to forecast dementia from single molecule

12.12.2018 | Health and Medicine

CCNY-Yale researchers make shape shifting cell breakthrough

12.12.2018 | Physics and Astronomy

Pain: Perception and motor impulses arise in the brain independently of one another

12.12.2018 | Health and Medicine

VideoLinks
Science & Research
Overview of more VideoLinks >>>