Analysis of satellite imagery to map burned areas in Sub-Saharan Africa CARBOAFRICA conference “Africa and Carbon Cycle: the CarboAfrica project” Accra.

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Presentation transcript:

Analysis of satellite imagery to map burned areas in Sub-Saharan Africa CARBOAFRICA conference “Africa and Carbon Cycle: the CarboAfrica project” Accra (Ghana) November 2008 Ilaria Palumbo, Heiko Balzter, Kevin Tansey Department of Geography, University of Leicester, UK

Vegetation index (green) and fire dynamics in Africa in the year 2001 seen from satellite. Source: NASA Fire activity in Africa

derive estimations of fire emissions; information about the extent; information about the temporal occurrence; information about the intensity of burning; Why mapping burned areas?

GBA2000 SPOT-VGT images, 1km ; Globscar ATSR-2, 1km ; Globcarbon VGT, (A)ATSR and MERIS, 1km ; L3JRC SPOT-VGT images, 1km - 7 years ; MCD45 MODIS, 500m - since 2002 ; others; Products available

global level coverage since the 1990s, 1km spatial resolution; dual view – nadir & forward; possible Aerosol Optical Depth retrieval and correction; the AATSR imagery Can we use AATSR for burned area mapping?

run model for the AOD retrieval; derive surface use the corrected reflectance for burned area mapping; Processing AATSR data AOD aerosol optical depth

TOA, VZA, SZA, lat, lon, cloud flags AATSR data extract parameters LUT cont.LUT oceanLUT urbanLUT dustLUT smoke INVERSION R surf, τ cont, E R surf, τ ocean, ER surf, τ urban, ER surf, τ dust, ER surf, τ smoke, E select Best-fit τ select ‘best’ R surf TOA: Top Of the Atmosphere Processing AATSR data

Results corrected surface reflectance 1-10 th July 2003 RGB: 1600, 870, 670 nm

Results period 1 st -10 h July 2003 RGB: 1600, 870, 550 nm …and problems

Can we use AATSR for burned area mapping? maybe not at continental level… some potentials exist though 

corrected surface reflectance 2 nd August am RGB: 1600, 870, 550 nm AATSR

MODIS/ Terra - 500m AATSR - 1km Comparison AATSR/MODIS

MODIS b urned area product MODIS vs AATSR higher spatial resolution (500m); better spatial coverage of the study area, limited missing data; validated using ETM+ scenes over southern Africa; information about quality assessment is provided.

MODIS MCD45A1 b urned area product MONTHLY BURNED AREA MAPS

Use MODIS product for further analysis extract burned area info per vegetation class; derive fire emissions at continental and country level; analysis of the climate-human-fire interactions; MCD45A1 burned areas Globcover

Conclusions the aerosol corrected ATSR series reflectance can be used to map burned area at regional level and before year 2000; the improved spatial resolution and more frequent coverage of the MODIS product is better suited to the needs of CARBOAFRICA; a reliable burned area map is needed to derive accurate emissions from fires.

thank you !