Airborne S-Band SAR for forest biophysical retrieval in temperate mixed forests of the UK

Show simple item record Ningthoujam, Ramesh K. Balzter, Heiko Tansey, Kevin Morrison, Keith Johnson, Sarah C. M. Gerard, France George, Charles Malhi, Yadvinder Burbidge, Geoff Doody, Sam Veck, Nick Llewellyn, Gary M. Blythe, Thomas Rodriguez-Vega, Pedro van Beijma, Sybrand Spies, Bernard Barnes, Chloe Padilla-Parellada, Mark Wheeler, James E. M. Louis, Valentin Potter, Tom Edwards-Smith, Alexander Polo Bermejo, Jamie 2016-10-07T10:26:20Z 2016-10-07T10:26:20Z 2016-07-20
dc.identifier.citation Ramesh K. Ningthoujam, Heiko Balzter, Kevin Tansey, et al., Airborne S-Band SAR for forest biophysical retrieval in temperate mixed forests of the UK. Remote Sensing (2016) volume 8, issue 7, article number 609
dc.description.abstract Radar backscatter from forest canopies is related to forest cover, canopy structure and aboveground biomass (AGB). The S-band frequency (3.1–3.3 GHz) lies between the longer L-band (1–2 GHz) and the shorter C-band (5–6 GHz) and has been insufficiently studied for forest applications due to limited data availability. In anticipation of the British built NovaSAR-S satellite mission, this study evaluates the benefits of polarimetric S-band SAR for forest biophysical properties. To understand the scattering mechanisms in forest canopies at S-band the Michigan Microwave Canopy Scattering (MIMICS-I) radiative transfer model was used. S-band backscatter was found to have high sensitivity to the forest canopy characteristics across all polarisations and incidence angles. This sensitivity originates from ground/trunk interaction as the dominant scattering mechanism related to broadleaved species for co-polarised mode and specific incidence angles. The study was carried out in the temperate mixed forest at Savernake Forest and Wytham Woods in southern England, where airborne S-band SAR imagery and field data are available from the recent AirSAR campaign. Field data from the test sites revealed wide ranges of forest parameters, including average canopy height (6–23 m), diameter at breast-height (7–42 cm), basal area (0.2–56 m2/ha), stem density (20–350 trees/ha) and woody biomass density (31–520 t/ha). S-band backscatter-biomass relationships suggest increasing backscatter sensitivity to forest AGB with least error between 90.63 and 99.39 t/ha and coefficient of determination (r2) between 0.42 and 0.47 for the co-polarised channel at 0.25 ha resolution. The conclusion is that S-band SAR data such as from NovaSAR-S is suitable for monitoring forest aboveground biomass less than 100 t/ha at 25 m resolution in low to medium incidence angle range. en_UK
dc.description.sponsorship Natural Environment Research Council Airborne Research & Survey Facility and Satellite Applications Catapult (Project Code: AS 14/24) en_UK
dc.publisher MDPI en_UK
dc.rights Attribution 4.0 International
dc.title Airborne S-Band SAR for forest biophysical retrieval in temperate mixed forests of the UK en_UK
dc.type Article en_UK

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