Suchergebnisse

This study addresses the role of satellite Earth Observation (EO) indicators within an operational crop yield forecasting system for the European Union (EU) and neighbouring countries, by exploring the correlation between official yield statistics and indicators derived from fAPAR time-series at sub-national level for the period 1999-2012, and by identifying possible differences across agro-climatic conditions in Europe.A significant correlation between fAPAR and official yields (R2>0.6) was found in water-limited yield agro-climatic conditions (e.g. the Black Sea region and the Mediterranean basin) for all three crops studied. In regions where crops experience frequent water stress, most of the yield inter-annual variability is explained by substantial changes in leaf area from one year to another, and can be well captured by regional fAPAR time-series. By contrast, in regions characterized by high yields (e.g. northern Europe) - where water constraints are generally not frequent and, therefore, fAPAR inter-annual variability is low - the correlation between fAPAR and yield is weaker (R2<0.5) as yield variations tend to be explained by multiple factors other than green leaf area.These results confirm the reliability of EO time-series for operational crop yield forecasting at regional level, but also suggest that additional meteorological variables (temperature, precipitation, evapotranspiration) need to be taken into account to interpret EO products meaningfully. Moreover, specific issues related to the spatial resolution of the EO-products, and the absence of dynamic crop masks, currently impede access to crop-specific time-series in the fragmented agricultural landscapes of Europe, and restrict the use of 1-km biophysical products to major crops.

Freshwater, aquaculture, fisheries, biodiversity, forests, and agricultural land have high economic and social value throughout the Africa, Caribbean and Pacific (ACP) region; but they can also be over‐exploited, with damaging consequences for local economies, long term stability and for the Earth system as a whole – especially the climate system. The ACP's fast growing population puts growing pressure on the environment to provide food, water and fibre, on the regions' urban centres and transport networks, and on energy sources. Information on the location, condition and evolution of resources is an important step towards sustainability, but unfortunately such information can be hard to get. Earth observing satellite technology combined with geographical information management can help fill the information gap. In this objective, and because of its unique position to support the implementation of advanced interoperable geospatial technologies, the Joint Research Centre (JRC) of the European Commission (EC) is setting‐up of an "Observatory for sustainable development" as single portal to support decision‐making for development in the fields of natural resource and food security. The African Union and European Union recognise the importance of this service and are beginning to develop this capacity as part of the AU EU joint strategic partnership. This paper describes the needs, and presents the first steps taken by the JRC and by the joint partnership in harnessing space technologies to help meet Millennium Development Goals, in particular eradication of poverty, and environmental sustainability. Santrauka Gėlasis vanduo, akvakultūra, žuvininkystė, biologinė įvairovė, miškų ir žemės ūkio paskirties žemė turi didėlę ekonominę ir socialinę vertę visoje Afrikoje, Karibų ir Ramiojo vandenyno (AKR) valstybių regione, bet šie veiksniai gali būti per daug eksploatuojami ir tureti žalingų padarinių vietinei ekonomikai, ilgalaikiam stabilumui ir visai Žemės sistemai, ypač klimato sistemai. Dėl greitai augančio AKR gyventojų skaičiaus regionų miestų centruose transporto tinklų ir energijos šaltinių vietose dideja aplinkos naudojimo mastas, siekiant gyventojus aprūpinti maistu, vandeniu ir lasteliena. Informacija apie vietoves išteklius, išteklių būklę ir raidą yra svarbus žingsnis siekiant darnos, bet, dėja, tokia informacija sunku surinkti. Žemės stebejimo palydovais technologija, sujungta su geografines informacijos valdymu, gali padėti užpildyti šios informacijos spragą. Dėl šio tikslo ir dėl unikalios padėties, siekiant diegti pažangias tarpusavyje saveikaujančias geoerdvines technologijas, Europos Komisijos (EK) jungtinis tyrimu centras (JTC) yra įkūręs Darnaus vystymosi observatorijas kaip viena portalą, kad palaikytų sprendimų priemimo plėtote gamtinių išteklių ir maisto saugumo srityse. Afrikos Sąjunga (AS) ir Europos Sąjunga (ES) pripažįsta šios paslaugos svarbą ir pradėjo plėtoti šiuos pajėgumus kaip dali strateginės AS ir ES partnerystės. Straipsnyje pristatomi pirmieji žingsniai, žengti AKR valstybių, plėtojant jungtinę partnerystę kosminių technologijų srityje, siekiant spręsti tūkstantmečio tikslus – mažinti skurdą ir tobulinti darnų aplinkos vystymą. First published online: 10 Feb 2011 Reikšminiai žodžiai:gamtos išteklių valdymas,nuotolinis stebėjimas,kosminis,stebėjimas,žemės stebėjimas,geografines informacijos valdymas,darnus vystymasis,Afrika,AKR

Freshwater, aquaculture, fisheries, biodiversity, forests, and agricultural land have high economic and social value throughout the Africa, Caribbean and Pacific (ACP) region; but they can also be over‐exploited, with damaging consequences for local economies, long term stability and for the Earth system as a whole – especially the climate system. The ACP's fast growing population puts growing pressure on the environment to provide food, water and fibre, on the regions' urban centres and transport networks, and on energy sources. Information on the location, condition and evolution of resources is an important step towards sustainability, but unfortunately such information can be hard to get. Earth observing satellite technology combined with geographical information management can help fill the information gap. In this objective, and because of its unique position to support the implementation of advanced interoperable geospatial technologies, the Joint Research Centre (JRC) of the European Commission (EC) is setting‐up of an "Observatory for sustainable development" as single portal to support decision‐making for development in the fields of natural resource and food security. The African Union and European Union recognise the importance of this service and are beginning to develop this capacity as part of the AU EU joint strategic partnership. This paper describes the needs, and presents the first steps taken by the JRC and by the joint partnership in harnessing space technologies to help meet Millennium Development Goals, in particular eradication of poverty, and environmental sustainability. Article in English. Darnus vystymasis besivystančiose šalyse: Afrikos, Karibų ir Ramiojo vandenyno valstybių apžvalga Santrauka.Gėlasis vanduo, akvakultūra, žuvininkystė, biologinė įvairovė, miškų ir žemės ūkio paskirties žemė turi didėlę ekonominę ir socialinę vertę visoje Afrikoje, Karibų ir Ramiojo vandenyno (AKR) valstybių regione, bet šie veiksniai gali būti per daug eksploatuojami ir tureti žalingų padarinių vietinei ekonomikai, ilgalaikiam stabilumui ir visai Žemės sistemai, ypač klimato sistemai. Dėl greitai augančio AKR gyventojų skaičiaus regionų miestų centruose transporto tinklų ir energijos šaltinių vietose dideja aplinkos naudojimo mastas, siekiant gyventojus aprūpinti maistu, vandeniu ir lasteliena. Informacija apie vietoves išteklius, išteklių būklę ir raidą yra svarbus žingsnis siekiant darnos, bet, dėja, tokia informacija sunku surinkti. Žemės stebejimo palydovais technologija, sujungta su geografines informacijos valdymu, gali padėti užpildyti šios informacijos spragą. Dėl šio tikslo ir dėl unikalios padėties, siekiant diegti pažangias tarpusavyje saveikaujančias geoerdvines technologijas, Europos Komisijos (EK) jungtinis tyrimu centras (JTC) yra įkūręs Darnaus vystymosi observatorijas kaip viena portalą, kad palaikytų sprendimų priemimo plėtote gamtinių išteklių ir maisto saugumo srityse. Afrikos Sąjunga (AS) ir Europos Sąjunga (ES) pripažįsta šios paslaugos svarbą ir pradėjo plėtoti šiuos pajėgumus kaip dali strateginės AS ir ES partnerystės. Straipsnyje pristatomi pirmieji žingsniai, žengti AKR valstybių, plėtojant jungtinę partnerystę kosminių technologijų srityje, siekiant spręsti tūkstantmečio tikslus – mažinti skurdą ir tobulinti darnų aplinkos vystymą. Reikšminiai žodžiai:gamtos išteklių valdymas,nuotolinis stebėjimas,kosminis,stebėjimas,žemės stebėjimas,geografines informacijos valdymas,darnus vystymasis,Afrika,AKR. First published online: 10 Feb 2011

International audience ; This study addresses the role of satellite Earth Observation (EO) indicators within an operational crop yield forecasting system for the European Union (EU) and neighbouring countries, by exploring the correlation between official yield statistics and indicators derived from fAPAR time-series at sub-national level for the period 1999-2012, and by identifying possible differences across agro-climatic conditions in Europe.A significant correlation between fAPAR and official yields (R2>0.6) was found in water-limited yield agro-climatic conditions (e.g. the Black Sea region and the Mediterranean basin) for all three crops studied. In regions where crops experience frequent water stress, most of the yield inter-annual variability is explained by substantial changes in leaf area from one year to another, and can be well captured by regional fAPAR time-series. By contrast, in regions characterized by high yields (e.g. northern Europe) - where water constraints are generally not frequent and, therefore, fAPAR inter-annual variability is low - the correlation between fAPAR and yield is weaker (R2<0.5) as yield variations tend to be explained by multiple factors other than green leaf area.These results confirm the reliability of EO time-series for operational crop yield forecasting at regional level, but also suggest that additional meteorological variables (temperature, precipitation, evapotranspiration) need to be taken into account to interpret EO products meaningfully. Moreover, specific issues related to the spatial resolution of the EO-products, and the absence of dynamic crop masks, currently impede access to crop-specific time-series in the fragmented agricultural landscapes of Europe, and restrict the use of 1-km biophysical products to major crops.

International audience ; This study addresses the role of satellite Earth Observation (EO) indicators within an operational crop yield forecasting system for the European Union (EU) and neighbouring countries, by exploring the correlation between official yield statistics and indicators derived from fAPAR time-series at sub-national level for the period 1999-2012, and by identifying possible differences across agro-climatic conditions in Europe.A significant correlation between fAPAR and official yields (R2>0.6) was found in water-limited yield agro-climatic conditions (e.g. the Black Sea region and the Mediterranean basin) for all three crops studied. In regions where crops experience frequent water stress, most of the yield inter-annual variability is explained by substantial changes in leaf area from one year to another, and can be well captured by regional fAPAR time-series. By contrast, in regions characterized by high yields (e.g. northern Europe) - where water constraints are generally not frequent and, therefore, fAPAR inter-annual variability is low - the correlation between fAPAR and yield is weaker (R2<0.5) as yield variations tend to be explained by multiple factors other than green leaf area.These results confirm the reliability of EO time-series for operational crop yield forecasting at regional level, but also suggest that additional meteorological variables (temperature, precipitation, evapotranspiration) need to be taken into account to interpret EO products meaningfully. Moreover, specific issues related to the spatial resolution of the EO-products, and the absence of dynamic crop masks, currently impede access to crop-specific time-series in the fragmented agricultural landscapes of Europe, and restrict the use of 1-km biophysical products to major crops.