The NASA AfriSAR campaign: Airborne SAR and lidar measurements of tropical forest structure and biomass in support of current and future space missions

REMOTE SENSING OF ENVIRONMENT

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Article

Fatoyinbo, Temilola¹  Armston, John²  Simard, Marc³  Saatchi, Sassan³  Denbina, Michael³  Lavalle, Marco³  Hofton, Michelle²  Tang, Hao²  Marselis, Suzanne²  Pinto, Naiara³  Hancock, Steven⁴  Hawkins, Brian³  Duncanson, Laura²  Blair, Bryan¹  Hansen, Christy¹  Lou, Yunling³  Dubayah, Ralph²  Hensley, Scott³  Silva, Carlos^2,5  Poulsen, John R.⁶  Labriere, Nicolas⁷  Barbier, Nicolas⁸  Jeffery, Kathryn⁹  Kenfack, David¹⁰  Herve, Memiaghe¹¹  Bissiengou, Pulcherie¹²  Alonso, Alfonso¹⁰  Moussavou, Ghislain¹³  White, Lee T. J.^9,14  Lewis, Simon^15,16  Hibbard, Kathleen¹⁷ 

[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20706 USA

[2] Univ Maryland, Dept Geog Sci, College Pk, MD 20742 USA

[3] CALTECH, Jet Prop Lab, Pasadena, CA USA

[4] Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland

[5] Univ Florida, Sch Forest Fisheries & Geomat Sci FFGS, Gainesville, FL 32611 USA

[6] Duke Univ, Nicholas Sch Environm, Durham, NC USA

[7] CNRS, Lab Evolut & Dive Biol, UMR 5174, IRD,UPS, Toulouse, France

[8] Univ Montpellier, CIRAD, INRA, CNRS,AMAP,IRD, Montpellier, France

[9] Univ Stirling, Sch Nat Sci, Stirling FK9 4LA, Scotland

[10] Smithsonian Inst, Smithsonian Trop Res Inst, Forest Global Earth Observ, Ctr Trop Forest Sci, Washington, DC 20560 USA

[11] Inst Rech Ecol Trop IRET, CENAREST, Libreville, Gabon

[12] Inst Pharmacopee & Med Tradit, CENAREST, Herbier Natl Gabon, Libreville, Gabon

[13] Agence Gabonaise Etudes & Observat Spatiales, Libreville, Gabon

[14] Agence Natl Pk Nationaux, Libreville, Gabon

[15] UCL, Dept Geog, London, England

[16] NASA Headquarters, Washington, DC USA

[17] Natl Univ Singapore, Dept Geog, Singapore, Singapore

关键词: AfriSAR;    LVIS;    UAVSAR;    GEDI;    NISAR;    BIOMASS;    Gabon;    Central Africa;    Airborne Campaigns;    Forest Structure;    Lidar;    SAR;   

DOI  :  10.1016/j.rse.2021.112533

来源: Elsevier

【 摘 要 】

In 2015 and 2016, the AfriSAR campaign was carried out as a collaborative effort among international space and National Park agencies (ESA, NASA, ONERA, DLR, ANPN and AGEOS) in support of the upcoming ESA BIOMASS, NASA-ISRO Synthetic Aperture Radar (NISAR) and NASA Global Ecosystem Dynamics Initiative (GEDI) missions. The NASA contribution to the campaign was conducted in 2016 with the NASA LVIS (Land Vegetation and Ice Sensor) Lidar, the NASA L-band UAVSAR (Uninhabited Aerial Vehicle Synthetic Aperture Radar). A central motivation for the AfriSAR deployment was the common AGBD estimation requirement for the three future spaceborne missions, the lack of sufficient airborne and ground calibration data covering the full range of ABGD in tropical forest systems, and the intercomparison and fusion of the technologies. During the campaign, over 7000 km2 of waveform Lidar data from LVIS and 30,000 km2 of UAVSAR data were collected over 10 key sites and transects. In addition, field measurements of forest structure and biomass were collected in sixteen 1-hectare sized plots. The campaign produced gridded Lidar canopy structure products, gridded aboveground biomass and associated uncertainties, Lidar based vegetation canopy cover profile products, Polarimetric Interferometric SAR and Tomographic SAR products and field measurements. Our results

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