gofc-gold efforts in harmonization and validation of land cover datasets chris schmullius &...
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GOFC-GOLD Efforts in Harmonization and Validation
of Land Cover Datasets
Chris Schmullius & Martin Herold ESA GOFC-GOLD Landcover Implementation Project Office
IGOL, 13-15 Sept. 2004
GOFC GOLD introduction
Multifaceted international strategy to bring the Earth’s land cover under continuous operational observation
Vision to share data, information and knowledge, leading to informed action and decision support
Network of participants implementing coordinated research for global monitoring of terrestrial resources, global assessments and the study of global change
Establishing international standards and protocols especially with respect to issues like validation
GOFC GOLD’s role
A Panel of the Global Terrestrial Observing System (GTOS) A long term process of building an improved match between
Observations, Data Products and User Needs
Space agenciesData “producer”
Science community
Data “users”FAO/UNEP etc.
GOFC GOLD
Implementation priorities2nd GOFC GOLD land cover implementation team w/s,
Jena, March 2004: Harmonization of global and regional land cover
products Validation of global earth observation products Adequacy and advocacy of earth observation in
serving international conventions Towards operational global observations of land Support of new IGOL-theme Strengthen international cooperations (e.g. regional
networks)
Why harmonization?
Land mapping uses different standards national maps, application specific, spectral classes
Compatibility and comparability Within and between countries Within and between applications and disciplines From local to global scales
Required for successful Improvement of mapping products Validation of global datasets Foster application: land change dynamics
Harmonization strategy
Originally strong push for single lc/lu legend Too much standardization reduces application
relevance of lc/lu maps Standardizing terminology rather than categories W/S: FAO/UNEP 1994, GOFC GOLD 2004
(Jena/Rome) Implementation strategy :
Two working groups: cover and use Find common language (LCCS) Need for case studies Impact on operational lc/lu data collection
LCCS Status and Use
LCCS-2: Software completed and ready for download September 2004
Manual available September 2004, translations in French, Spanish and Arabic scheduled in the year 2005
GOFC GOLD endorses LCCS Feedback to improve LCCS Translation of legends (start @ Rome w/s)
IGBP legend translationRome workshoptranslations:• IGBP DIS• MODIS LC • MODIS Cont.Flds.• CORINE• GLC2000-> already in LCCS
MODIS LC
LCCS Software Workshop discussions
Forest areas in global land cover maps
Forest definitions:IGBP legend : percent tree cover >60% / tree height >2m GLC2000 legend : percent tree cover >15% / tree height >3m
Differences for urban areas
Sources of urban land:IGBP DIS – Digital chart of the worldMODIS – MODIS(2000) + DMSP (1994/95)GLC2000 – DMSP (1994/95)
ShanghaiSao Paolo
tree cover threshold0% 100%
Forest cover from continuous field products
Credit: M. Hansen/University of Maryland
0% 100%
VCF can support harmonization of land cover data
tree cover threshold
Credit: M. Hansen/University of Maryland
GLOBCOVERPartnership: ESA - JRCPrograms: GOFC/GOLD - IGBPUsers: FAO, UNEP, UN Conventions (CCD, CB)
Objectives: Global Land Cover Map in 2005 by usingENVISAT MERIS data at 300m (15 bands)
Schedule: Definition phase Spring 2004 Invitation To Tender July 2004
KO December 2004First Monthly Mosaic September 2005GLOBCOVER V1 September 2006GLOBCOVER V2 September 2007Validation September 2008
Implementation: One European consortium industry/companies
GLC2000 versus GLOBCOVER
GLC-2000 map at 1km res. LC map from MERIS at 300m res.
Validation of land cover datasets GOFC GOLD fosters international effort to validate
all existing global land cover products Consistent with “Best Practices” identified by CEOS
Land Cover Validation Working Group Create „living“ dataset for future land cover products
(e.g. GLOBCOVER) Use of GOFC GOLD regional networks Harmonization experiences are essential LCCS provides the framework to translate the
individual in situ interpretations Frustration with lack of funding for validation