Space Applications Institute (jmg/fireglob/Gba_vgt/GBA_MethodsWorkshop) Global Vegetation Monitoring Unit The Global Burnt Area 2000 initiative: GBA-2000.

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Presentation transcript:

Space Applications Institute (jmg/fireglob/Gba_vgt/GBA_MethodsWorkshop) Global Vegetation Monitoring Unit The Global Burnt Area 2000 initiative: GBA-2000 Mapping, from SPOT-VEGETATION S1 imagery, of the areas burnt globally during the year 2000 J-M. Grégoire SAI-GVM 22 nd March 2001

Space Applications Institute (jmg/fireglob/Gba_vgt/GBA_MethodsWorkshop) Global Vegetation Monitoring Unit The Global Burnt Area 2000 initiative: GBA-2000  A contribution to the Global Land Cover (GLC 2000) initiative  In response to the needs for environmental assessment of the interactions between biomass burning and land cover change: Biodiversity, Desertification and Climate Change Conventions between biomass burning and emissions of GHG & aerosols: Climate Change Convention

Space Applications Institute (jmg/fireglob/Gba_vgt/GBA_MethodsWorkshop) Global Vegetation Monitoring Unit  a binary map (burnt-unburnt) monthly non-accumulative global burn scar map, at 1 km resolution  statistics of burnt areas area burnt in 2000 per country, per month, and per main types of vegetation cover (IGBP-DIS and Hansen et al.) GBA-2000 Product definition

Space Applications Institute (jmg/fireglob/Gba_vgt/GBA_MethodsWorkshop) Global Vegetation Monitoring Unit GBA-2000 General approach  Selection of a limited number of co-investigators : 8 criteria: access to validation data sets & field expertise/contacts  Development of regional algorithms for processing VGT S1 imagery to burnt area maps  Integration of the regional algorithms into a global processing chain at JRC

Space Applications Institute (jmg/fireglob/Gba_vgt/GBA_MethodsWorkshop) Global Vegetation Monitoring Unit GBA 2000 Co-Investigators CSIRO(AU) - UTL(P) - NRI(UK) - CNR(I) - CCRS (CA) - CRG (CA) - IFI (RU) - SAI (EU) GBA test-sites (white rectangles; indicative position), with corresponding geographical coordinates (Ul; LR corners) 63N - 81W 44N - 55W (CRG) 62.5N-112W 57N-104.5W (CCRS) 18N - 93W 7N - 77W (NRI) 5S - 75W 20S - 45W (UTL) 17S - 21E 28S - 29E (NRI) 10S - 22E 28S - 42E (UTL) 18N - 18W E (CNR) 44N - 10W 36N - 0 (UTL) 11S - 125E 21S - 135E (CSIRO) 60N - 118E 48N - 140E (IFI) 68N - 45E 60N - 60E (IFI) 55N - 115E 40N - 135E (UTL) 10S - 125E 18S - 146E (GVM)

Space Applications Institute (jmg/fireglob/Gba_vgt/GBA_MethodsWorkshop) Global Vegetation Monitoring Unit GBA-2000 Methodology: Pre-processing Masking  for clouds & cloud shadows (adapted from Kempeneers et al.,2000)  for extreme viewing zenith angles (> 50 o )  for max. NDVI composite areas (+/- 32 o Lat.)  for non-burnable areas. IGBP-DIS (EDC/USGS). Simple Biosphere Model 2 (EDC). Maryland Global Landcover Dataset (Hansen et al., 2000)

Space Applications Institute (jmg/fireglob/Gba_vgt/GBA_MethodsWorkshop) Global Vegetation Monitoring Unit GBA-2000 Methodology: Processing to burnt area maps  Supervised temporal change detection techniques, on a pixel basis applied to single date images (NRI, Flasse et al.; UTL, Pereira et al.) non consecutive images: 5-day cycle (Boschetti et al., 2001)  Supervised temporal change detection techniques, on a pixel basis applied to composite images (JRC, Stroppiana et al., 2001; IFI, Ershov et al.) compositing = 10-day, min NIR  Supervised temporal change detection techniques, on a pixel basis but with a spatial dependency (CNR, Brivio et al.) applied to single date images contextual window 3x3 neural network approach 3 approaches currently tested All based on change detection techniques in NIR, SWIR & NDWI

Space Applications Institute (jmg/fireglob/Gba_vgt/GBA_MethodsWorkshop) Global Vegetation Monitoring Unit GBA-2000 Methodology: Validation  Performance analysis of the algorithm(s) regression estimator, restricted to the regions covered by high resolution imagery (TM) + overall accuracy + under and overestimation errors  Validation fo the final map how to validate a global map of burnt areas ???????  Comparison with other global burnt area product for the year 2000 GLOBSCAR product – from ATSR imagery (ESA/ESRIN)

Space Applications Institute (jmg/fireglob/Gba_vgt/GBA_MethodsWorkshop) Global Vegetation Monitoring Unit GBA-2000 Status on March 2001  Data distribution to co-investigators completed  Development of regional algorithms + completed for Australia test-site + nearly completed forAfrica, Northern hemisphere Africa, Namibia/Botswana site + initiated forAfrica, Mozambic test-site Russia, Far East Siberia Canada + evaluation during the GOFC-Fire workshop, Lisbon, July 9-11  Global processing chain at JRC + pre-processing module completed + processing module: tests started over the African continent