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Bouvet_IGARSS2011.ppt
1. A land cover map of Africa at 100m using a mosaic of ALOS PALSAR dual-polarization data - Preliminary developments - Alexandre Bouvet, Gianfranco De Grandi European Commission DG Joint Research Centre 21027, Ispra (VA), Italy e-mail: [email_address]
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3. VCF (Vegetation Continuous Field) University of Maryland - NASA MODIS - 500m GLC2000 (Global Land Cover 2000) JRC SPOT VEGETATION - 1km GLOBCOVER ESA - JRC MERIS – 300m EXISTING LARGE-SCALE MAPS
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5. East North incident wave lon lat INFLUENCE OF TOPOGRAPHY Local incidence angle: θ loc depends on: θ : the SAR incident angle φ : the viewing azimuth angle α : the absolute slope β : the slope orientation In the mosaic, the SAR geometry is almost constant: θ≈ 39˚ φ≈ 10.5˚ θ loc is fully described by the local topography ( α and β ). SAR geometry local topography
17. WATER BODIES HH-HV-HH White: α =0° Grey: buffer 10 pix Classified Pros: false detection (bare soil/low vegetation detected as water) is reduced Cons: some water bodies are missed
18. VCF GLC Tile centered on: 32.5°S–27.5° E South Africa RESULTS VCF GLC2000 GLOBCOVER PALSAR
19. Tile centered on: 2.5°S – 17.5° E Border between the Congos Transition from tropical forest to savanna. VCF GLC GlobCover VCF GLC2000 GLOBCOVER PALSAR RESULTS
![A land cover map of Africa at 100m using a mosaic of ALOS PALSAR dual-polarization data - Preliminary developments - Alexandre Bouvet, Gianfranco De Grandi European Commission DG Joint Research Centre 21027, Ispra (VA), Italy e-mail: [email_address]](https://image.slidesharecdn.com/bouvet-igarss2011-110728105351-phpapp02/85/bouvetigarss2011ppt-1-320.jpg)
![ALOS Kyoto & Carbon (K&C) Initiative CONTEXT Global coverage of the African continent with PALSAR observations at two polarizations (HH + HV), one date (mainly July-August 2007) Objectives of K&C: define, develop and validate thematic products used to meet the specific information requirements relating to the international environmental Conventions, Carbon Cycle Science and Conservation of the environment Systematic data acquisition strategy ,[object Object],[object Object],De Grandi et al., IEEE TGRS, in press](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)