Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Finding farmland: New maps offer a clearer view of global agriculture


A new global cropland map combines multiple satellite data sources, reconciled using crowdsourced accuracy checks, to provide an improved record of total cropland extent as well as field size around the world.

Knowing where agricultural land is located is crucial for regional and global food security planning, and information on field size offers valuable insight into local economic conditions. Two new global maps, released today in the journal Global Change Biology, provide a significant step forward in global cropland information on these two topics.

IIASA-IFPRI Global Cropland Map (Africa)

IIASA Geo-Wiki Project; Google

IIASA Cropland Size Map

IIASA Geo-Wiki Project; Google

IIASA-IFPRI Global Cropland Map
The first map shows global cropland percentages at 1 kilometer resolution for the year 2005. It was developed by the International Institute for Applied Systems Analysis (IIASA) and the International Food Policy Research Institute (IFPRI) using a hybridization of multiple data sources contributed by many other institutes and organizations, combined with crowdsourcing validation data where volunteers used high-resolution data to check the accuracy of larger-scale maps.

“Current sources of information on cropland extent are not accurate enough for most applications,” says IIASA researcher Steffen Fritz, who led the project. “The global cropland map is a low cost solution to fill this need.”

IIASA researcher and co-author Linda See adds, “Our hybrid approach combines existing maps to produce a better integrated product than any of the individual global base maps currently available.”

The new global cropland map is more accurate, by virtue of increased agreement between different datasets on cropland cover. The researchers used a likelihood method to quantify the level of uncertainty, using agreement between maps to assign a likelihood to each area. See explains, “Where all maps agree there is cropland, there is a higher likelihood that cropland is present.” The map improves an earlier hybrid map first released in 2011 by IIASA.

“Getting an accurate crop map is particularly difficult in developing countries, where smallholder plots are tough to differentiate from the surrounding vegetation,” said Liangzhi You, a senior research fellow at IFPRI. “Yet cropland information is fundamental to both policymakers and donors so that they can better target their agricultural and rural development policies and investments.”

Global Field Size Map
The study also presents the first ever global field size map—an important proxy for mechanization and human development. This map was based entirely on crowdsourced data collected through IIASA’s Geo-Wiki project, a crowdsourcing initiative that relies on a global network of citizen scientists, who have looked at thousands of high-resolution images of land cover to determine whether cropland was present or not.

See says, “The field size map is really unique—no such global product currently exists.”

The researchers say that the new maps show the power of crowdsourcing for massive data analysis projects. Last year, Fritz won a Consolidator Grant from the European Research Council to continue and expand this work. He and colleagues are now working to expand the field size mapping activities in collaboration with Sokoine University of Agriculture in Tanzania.

Fritz says, “Crowdsourcing has incredible potential for gathering this type of information, and it could be particularly valuable in Africa, where future food security is a major uncertainty.”

Fritz et. al. 2015. Mapping global cropland and field size. Global Change Biology. Advance Copy Available Upon Request

Maps are available on


Steffen Fritz
Research Scholar
Ecosystems Services and Management
+43(0) 2236 807 353

Linda See
Research Scholar
Ecosystems Services and Management
+43(0) 2236 807 423

Katherine Leitzell
IIASA Press Office
Tel: +43 2236 807 316
Mob: +43 676 83 807 316

Weitere Informationen:

MSc Katherine Leitzell | idw - Informationsdienst Wissenschaft

More articles from Agricultural and Forestry Science:

nachricht Forest Management Yields Higher Productivity through Biodiversity
14.10.2016 | Technische Universität München

nachricht Farming with forests
23.09.2016 | University of Illinois College of Agricultural, Consumer and Environmental Sciences (ACES)

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

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

Im Focus: Light-driven atomic rotations excite magnetic waves

Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion

Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...

Im Focus: New 3-D wiring technique brings scalable quantum computers closer to reality

Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.

"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...

Im Focus: Scientists develop a semiconductor nanocomposite material that moves in response to light

In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.

A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...

Im Focus: Diamonds aren't forever: Sandia, Harvard team create first quantum computer bridge

By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.

"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...

Im Focus: New Products - Highlights of COMPAMED 2016

COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.

In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...

All Focus news of the innovation-report >>>



Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

Agricultural Trade Developments and Potentials in Central Asia and the South Caucasus

14.10.2016 | Event News

World Health Summit – Day Three: A Call to Action

12.10.2016 | Event News

Latest News

First-time reconstruction of infectious bat influenza viruses

25.10.2016 | Life Sciences

Novel method to benchmark and improve the performance of protein measumeasurement techniques

25.10.2016 | Life Sciences

Amazon rain helps make more rain

25.10.2016 | Life Sciences

More VideoLinks >>>