JeanFrancois Pekel Andrew Cottam Noel Gorelick and Alan Belward EC Joint Research Centre Google Side Event GEOGLOWS and the Harmonization of GEO Water Activities European ID: 652364
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Global Surface Water Explorer
Jean-Francois Pekel, Andrew Cottam, Noel Gorelick* and Alan Belward EC Joint Research Centre, *Google
Side Event: GEOGLOWS
and the Harmonization of GEO Water Activities
European
Commission/ Google
Earth
EngineSlide2
Global Surface Water Explorer
Mission / Objectives and GoalsMissionTo produce maps and statistics documenting when and where the Earth’s land surface has been covered by water during the past 32 years at 30m resolution
Objectives
Globally consistent set of maps, fully validated,
distributed with free-and-open access license and easily accessible through an interactive web interface
Goal
Map all open water surfaces (inland and coastal) at global scale, every month of every year at a spatial resolution of 30m. Produce a set of thematic products documenting different facets of the surface water dynamics.Slide3
Global Surface Water Explorer
Geographical ScopeMethodologyExpert system applied to global Landsat L1T archive at the pixel scale (1.8 PB data), accompanied by validation protocolProject Governance Structure
Collaboration between EC Joint Research Centre and Google Earth Engine. Longer-term goal is transition to Copernicus Global Land Service
GlobalSlide4
C
hanges in global surface water at 30m resolution; variations in persistence and location between March 1984 and October 2015; gain, loss and constancy in persistence (1984-2000-2015); recurrence (frequency with which water reappears from year to year); annual seasonality; transitions among permanent water, seasonal water and land classes between first and last year of observation; maximum surface water extent; annual / monthly water history at pixel scale; change measurements at global, continental, and country scale. https://global-surface-water.appspot.com
/Pekel, J-F. et al., (2016) Nature 540, 418–422 doi:10.1038/nature20584
Achievement
1Global Surface Water Explorer
Significant achievements in 2016-2017Slide5
Global Surface Water Explorer
Plans and Deliverables for 2018-2019- Annual permanent surface water area and trends by country (with estimate of uncertainty) 1984 – 2015- Coastal erosion/accretion- Natural / artificial water body identificationDeliverables
General Plans- Update time series to end of 2017- Produce 20m resolution using Sentinel 2 and Landsat
- Move towards operational product generationSlide6
UNFCCC: Global Climate Observing System (2016 Plan), Lake Area essential climate variableCBD: Ecosystem function
(inundation)Sustainable Development on our Human Planet (GEO)UNCCD: Part of 14 point land degradation classification (World Atlas of Desertification)Links to other SBAs or initiativesGlobal Surface Water ExplorerPlans for cross SBA linkages and SDG support
GEOGLOWS and the Harmonization of GEO Water Activities
Contributions to
SDGs
Indicator 6.6.1 Change in the extent of water-related ecosystems over
time
Indicator 15.3.1 Proportion of land that is degraded over total land
area (indirect)
Target 15.5 Take urgent and significant action to reduce the degradation of natural
habitats...
Challenges and Issues:
Data handling is still a challenge at petabyte scales, Landsat archive consolidation still
needed, global scale Sentinel 2 a and 2 b still to be integratedSlide7
Thank You
Jrc-surfacewater@ec.europa.eu