Next Article in Journal
Multi-Scale Evaluation of the SMAP Product Using Sparse In-Situ Network over a High Mountainous Watershed, Northwest China
Next Article in Special Issue
Improving Accuracy Estimation of Forest Aboveground Biomass Based on Incorporation of ALOS-2 PALSAR-2 and Sentinel-2A Imagery and Machine Learning: A Case Study of the Hyrcanian Forest Area (Iran)
Previous Article in Journal
Fire Regimes and Their Drivers in the Upper Guinean Region of West Africa
Previous Article in Special Issue
Impacts of Airborne Lidar Pulse Density on Estimating Biomass Stocks and Changes in a Selectively Logged Tropical Forest
Article

Relationships of S-Band Radar Backscatter and Forest Aboveground Biomass in Different Forest Types

1
School of Geography, Geology and the Environment , Centre for Landscape and Climate Research, University of Leicester, Leicester LE1 7RH, UK
2
Department of Life Sciences, Imperial College London, Silwood Park Campus, Buckhurst Road, Ascot SL5 7PY, UK
3
National Centre for Earth Observation (NCEO), University of Leicester, Leicester LE1 7RH, UK
4
Geography, College of Life and Environmental Sciences, University of Exeter, Exeter EX44RJ, UK
5
School of Geosciences, University of Edinburgh, Edinburgh EH9 3FF, UK
6
Faculty of Forestry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Benhama Ganderbal J&K 191201, India
7
School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Remote Sens. 2017, 9(11), 1116; https://doi.org/10.3390/rs9111116
Received: 21 August 2017 / Revised: 5 October 2017 / Accepted: 30 October 2017 / Published: 2 November 2017
(This article belongs to the Special Issue Biomass Remote Sensing in Forest Landscapes)
Synthetic Aperture Radar (SAR) signals respond to the interactions of microwaves with vegetation canopy scatterers that collectively characterise forest structure. The sensitivity of S-band (7.5–15 cm) backscatter to the different forest types (broadleaved, needleleaved) with varying aboveground biomass (AGB) across temperate (mixed, needleleaved) and tropical (broadleaved, woody savanna, secondary) forests is less well understood. In this study, Michigan Microwave Canopy Scattering (MIMICS-I) radiative transfer model simulations showed strong volume scattering returns from S-band SAR for broadleaved canopies caused by ground/trunk interactions. A general relationship between AirSAR S-band measurements and MIMICS-I simulated radar backscatter with forest AGB up to nearly 100 t/ha in broadleaved forest in the UK was found. Simulated S-band backscatter-biomass relationships suggest increasing backscatter sensitivity to forest biomass with a saturation level close to 100 t/ha and errors between 37 t/ha and 44 t/ha for HV and VV polarisations for tropical ecosystems. In the near future, satellite SAR-derived forest biomass from P-band BIOMASS mission and L-band ALOS-2 PALSAR-2 in combination with S-band UK NovaSAR-S and the joint NASA-ISRO NISAR sensors will provide better quantification of large-scale forest AGB at varying sensitivity levels across primary and secondary forests and woody savannas. View Full-Text
Keywords: forest aboveground biomass; MIMICS-I model; AirSAR S-band SAR; temperate; tropics forest aboveground biomass; MIMICS-I model; AirSAR S-band SAR; temperate; tropics
Show Figures

Graphical abstract

MDPI and ACS Style

Ningthoujam, R.K.; Balzter, H.; Tansey, K.; Feldpausch, T.R.; Mitchard, E.T.A.; Wani, A.A.; Joshi, P.K. Relationships of S-Band Radar Backscatter and Forest Aboveground Biomass in Different Forest Types. Remote Sens. 2017, 9, 1116. https://doi.org/10.3390/rs9111116

AMA Style

Ningthoujam RK, Balzter H, Tansey K, Feldpausch TR, Mitchard ETA, Wani AA, Joshi PK. Relationships of S-Band Radar Backscatter and Forest Aboveground Biomass in Different Forest Types. Remote Sensing. 2017; 9(11):1116. https://doi.org/10.3390/rs9111116

Chicago/Turabian Style

Ningthoujam, Ramesh K., Heiko Balzter, Kevin Tansey, Ted R. Feldpausch, Edward T.A. Mitchard, Akhlaq A. Wani, and Pawan K. Joshi 2017. "Relationships of S-Band Radar Backscatter and Forest Aboveground Biomass in Different Forest Types" Remote Sensing 9, no. 11: 1116. https://doi.org/10.3390/rs9111116

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop