Big data, satellites and climate change

©James Thew/Alamy Stock Photo

Meteorology was the first scientific discipline to use space capabilities in the 1960s, and today satellites provide observations of the state of the atmosphere and ocean surface for the preparation of weather analyses, forecasts, advisories and warnings, for climate monitoring and environmental activities. Three-quarters of the data used in numerical weather prediction models depend on satellite measurements. 

International co-ordination for climate monitoring is led by the Steering Committee of the Global Climate Observing System (GCOS). This group was created in 1992 by the World Meteorological Organization, the Intergovernmental Oceanographic Commission, UNESCO and the United Nations Environment Programme. Noting that climate change was at this time still poorly understood and documented in many countries, the GCOS championed the introduction of a range of “essential climate variables” or ECVs–physical, chemical or biological variables or a group of linked variables that critically contributes to the characterisation of earth’s climate–to more comprehensively and systematically monitor changes to the climate, in this way supporting the work of the Intergovernmental Panel on Climate Change (IPCC).

Earth observation satellites are firmly embedded in this international system to monitor climate change. Satellite data provide significant contributions to more than half of the 50 essential climate variables that are currently in use. Some of these contributions can only be provided by satellite. This includes satellite radar altimetry, which measures the distance between the spacecraft and the earth’s surface below and can provide precise and continuous measures of global sea levels. Groundwater storage, recharge and discharge can be measured by changes and variations in earth gravity, which, in turn are detected by satellites. […]Satellite instruments are also responsible for measuring the chemical composition of the atmosphere and tracking the presence of carbon dioxide, methane, ozone and other greenhouse gases; the monitoring of sea ice, polar ice caps, ice sheets and glaciers (using altimetry, radar imagery and gravitational instruments); and finally, the monitoring of extreme weather events through the observation of sea surface temperatures, wind speed and sea levels, and tracking storms via powerful optical satellites in geostationary orbit.

With new-generation satellites, both optical and temporal resolutions will be greatly improved, which will also lead to improved weather forecasting and climate modelling abilities, as well as better real-time monitoring of many variables in the next decade. Improved satellite instruments will allow a broader range of measurements, as new-generation satellites replace and supplement existing missions. Several new missions will be launched within the next five years, including Eumetsat’s second-generation polar-orbiting satellites and third-generation geostationary Meteosats and the European Sentinels in the Copernicus programme, as well as several Chinese satellites. Secondly, coverage and system resilience will be improved thanks to better international co-operation and more national providers and co-operative international missions. For instance, the Chinese FY-3 satellites will be the third pillar in the constellation of polar-orbiting systems, in addition to US and European satellites, according to the World Meteorological Organization.

Approximately 130 earth observation missions were operational as of October 2015, according to the database of the Committee for Earth Observation Satellites, which is a co-ordination body for earth observation satellite activities, originally established by the G7 countries in 1984. This includes missions and/or instruments to observe the atmosphere, land, oceans, ice and snow, as well as gravity and magnetic fields, and as such comprising weather satellites and many remote sensing satellites, operated by government agencies, thus excluding commercial constellations such as Skybox, GeoEye, WorldView, etc., which may appear in other databases for remote sensing. Some of these missions are dual-use (such as Italy’s CosmoSkyMED constellation), meaning that some of the instruments may also have commercial or military applications.

Many missions are also the result of international co-operation, with several agencies contributing instruments or other types of support. A satellite mission consists of one or several satellites (the GRACE mission, for instance, consists of two satellites flying in formation), carrying one or several instruments. About 350 instruments are currently flown on missions supported by the CEOS. The majority of missions are operated by the United States, Europe (including the ESA, Eumetsat and national agencies), China and the Russian Federation. Future missions are in different stages of preparation and financial approval. So far, 66 missions have been approved to replace or supplement existing activities within the next 15 years, while another 100 are more uncertain, either planned or under consideration, some of which may eventually be abandoned.

Innovation is progressing but continuity of observations remains a concern. Government programme cuts, satellite failures and delays pose a constant threat to measurement systems. Indeed, gaps in the time series of meteorological data were mentioned in the US Government Accountability Office’s high-risk report for 2015. The Steering Committee of the Global Climate Observing System reports that measurements of certain essential climate variables (solar irradiance and of sea-surface temperature at microwave frequencies) are at risk of being discontinued.

Storage and long-term preservation of data is also an issue. With increased optical and temporal resolution, satellite missions produce an increasing amount of data. […]It may become more difficult to decide which data to archive for long-term conservation and which to use for further processing and then discard. […]

This raises the issue of data access and distribution. To maximise the societal benefits of the data, data need to be efficiently shared and distributed, and raw data must be transformed into value-added products.[…] There are discussions in the community on how the development of commercial downstream services could affect data accessibility policies in the long run. Public-private partnerships are one of the available options to pool costs and reduce government spending on satellite missions and on long-term data storage. However, this could have a negative impact on data sharing and accessibility.

Extracted and adapted from “Could big data from satellites play a major role in climate change management?” in Chapter 4 of Space and Innovation, OECD Publishing, 2016, available at  

space,innovation,big data,satellite,climate change,data,science

Image from the National Oceanic and Atmospheric Administration (NOAA) dated 16 November 2015 shows the satellite sea surface temperatures for October 2015, where orange-red colours are above normal temperatures and are indicative of El Niño. ©NOAA/AFP



For complete references and charts, see the above report.

OECD (2014), Space Economy at a Glance, OECD Publishing, Paris,

US Government Accountability Office (2015), “High-risk series: An update”, GAO-15-290, Government Accountability Office, Washington, DC,  

World Meteorological Organization (2015), “Status of the Global Observing System for Climate: Full report”, GCOS-195, World Meteorological Organization, Geneva, October,

©OECD Observer No 307 Q3 2016

Economic data

GDP growth: +0.6% Q1 2019 year-on-year
Consumer price inflation: 2.3% May 2019 annual
Trade: +0.4% exp, -1.2% imp, Q1 2019
Unemployment: 5.2% July 2019
Last update: 8 July 2019

OECD Observer Newsletter

Stay up-to-date with the latest news from the OECD by signing up for our e-newsletter :

Twitter feed

Subscribe now

<b>Subscribe now!</b>

To order your own paper editions,email

Online edition
Previous editions

Don't miss

  • MCM logo
  • The following communiqué and Chair’s statement were issued at the close of the OECD Council Meeting at Ministerial level, this year presided by the Slovak Republic.
  • Food production will suffer some of the most immediate and brutal effects of climate change, with some regions of the world suffering far more than others. Only through unhindered global trade can we ensure that high-quality, nutritious food reaches those who need it most, Angel Gurría, Secretary-General of the OECD, and José Graziano da Silva, Director-General of the United Nations Food and Agriculture Organization, write in their latest Project Syndicate article. Read the article here.
  • Globalisation will continue and get stronger, and how to harness it is the great challenge, says OECD Secretary-General Gurría on Bloomberg TV. Watch the interview here.
  • OECD Secretary-General Angel Gurría with UN Secretary-General António Guterres at the 73rd Session of the UN General Assembly, in New York City.
  • The new OECD Observer Crossword, with Myles Mellor. Try it online!
  • Listen to the "Robots are coming for our jobs" episode of The Guardian's "Chips with Everything podcast", in which The Guardian’s economics editor, Larry Elliott, and Jeremy Wyatt, a professor of robotics and artificial intelligence at the University of Birmingham, and Jordan Erica Webber, freelance journalist, discuss the findings of the new OECD report "Automation, skills use and training". Listen here.
  • Do we really know the difference between right and wrong? Alison Taylor of BSR and Susan Hawley of Corruption Watch tell us why it matters to play by the rules. Watch the recording of our Facebook live interview here.
  • Has public decision-making been hijacked by a privileged few? Watch the recording of our Facebook live interview with Stav Shaffir, MK (Zionist Union) Chair of the Knesset Committee on Transparency here.
  • Can a nudge help us make more ethical decisions? Watch the recording of our Facebook live interview with Saugatto Datta, managing director at ideas42 here.
  • The fight against tax evasion is gaining further momentum as Barbados, Côte d’Ivoire, Jamaica, Malaysia, Panama and Tunisia signed the BEPS Multilateral Convention on 24 January, bringing the total number of signatories to 78. The Convention strengthens existing tax treaties and reduces opportunities for tax avoidance by multinational enterprises.
  • Globalisation’s many benefits have been unequally shared, and public policy has struggled to keep up with a rapidly-shifting world. The OECD is working alongside governments and international organisations to help improve and harness the gains while tackling the root causes of inequality, and ensuring a level playing field globally. Please watch.
  • Checking out the job situation with the OECD scoreboard of labour market performances: do you want to know how your country compares with neighbours and competitors on income levels or employment?
  • Trade is an important point of focus in today’s international economy. This video presents facts and statistics from OECD’s most recent publications on this topic.
  • The OECD Gender Initiative examines existing barriers to gender equality in education, employment, and entrepreneurship. The gender portal monitors the progress made by governments to promote gender equality in both OECD and non-OECD countries and provides good practices based on analytical tools and reliable data.
  • Interested in a career in Paris at the OECD? The OECD is a major international organisation, with a mission to build better policies for better lives. With our hub based in one of the world's global cities and offices across continents, find out more at .
  • Visit the OECD Gender Data Portal. Selected indicators shedding light on gender inequalities in education, employment and entrepreneurship.

Most Popular Articles

OECD Insights Blog

NOTE: All signed articles in the OECD Observer express the opinions of the authors
and do not necessarily represent the official views of OECD member countries.

All rights reserved. OECD 2019