Lidar‐based aboveground biomass is derived based on the empirical relationship
between lidar‐measured vegetation height and aboveground biomass, often leading to large
uncertainties of aboveground biomass estimates at large scales. This study investigates
whether the use of any additional lidar‐derived vegetation structure parameters besides
height improves aboveground biomass estimation. The analysis uses data collected in the
field and with the Laser Vegetation Imaging Sensor (LVIS), and the Echidna® validation
instrument (EVI), a ground‐based hemispherical‐scanning lidar data in New England in
2003 and 2007. Our field data analysis shows that using wood volume (approximated by the
product of basal area and top 10% tree height) and vegetation type (conifer/softwood or
deciduous/hardwood forests, providing wood density) has the potential to improve
aboveground biomass estimates at large scales. This result is comparable to previous
individual‐tree based analyses. Our LVIS data analysis indicates that structure parameters
that combine height and gap fraction, such as RH100*cover and RH50*cover, are closely
related to wood volume and thus biomass particularly for conifer forests. RH100*cover
and RH50*cover perform similarly or even better than RH50, a good biomass predictor
found in previous study. This study shows that the use of structure parameters that combine
height and gap fraction (rather than height alone) improves the aboveground biomass
estimate, and that the fusion of lidar and optical remote sensing (to provide vegetation type)
will provide better aboveground biomass estimates than using lidar alone. Our ground lidar
analysis shows that EVI provides good estimates of wood volume, and thus accurate
estimates of aboveground biomass particularly at the stand level
Lidar‐based aboveground biomass is derived based on the empirical relationshipbetween lidar‐measured vegetation height and aboveground biomass, often leading to largeuncertainties of aboveground biomass estimates at large scales. This study investigateswhether the use of any additional lidar‐derived vegetation structure parameters besidesheight improves aboveground biomass estimation. The analysis uses data collected in thefield and with the Laser Vegetation Imaging Sensor (LVIS), and the Echidna® validationinstrument (EVI), a ground‐based hemispherical‐scanning lidar data in New England in2003 and 2007. Our field data analysis shows that using wood volume (approximated by theproduct of basal area and top 10% tree height) and vegetation type (conifer/softwood ordeciduous/hardwood forests, providing wood density) has the potential to improveaboveground biomass estimates at large scales. This result is comparable to previousindividual‐tree based analyses. Our LVIS data analysis indicates that structure parametersthat combine height and gap fraction, such as RH100*cover and RH50*cover, are closelyrelated to wood volume and thus biomass particularly for conifer forests. RH100*coverand RH50*cover perform similarly or even better than RH50, a good biomass predictorfound in previous study. This study shows that the use of structure parameters that combineheight and gap fraction (rather than height alone) improves the aboveground biomassestimate, and that the fusion of lidar and optical remote sensing (to provide vegetation type)
will provide better aboveground biomass estimates than using lidar alone. Our ground lidar
analysis shows that EVI provides good estimates of wood volume, and thus accurate
estimates of aboveground biomass particularly at the stand level
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