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Three-dimensional mapping of light transmittance and foliage distribution using lidar

Three-dimensional mapping of light transmittance and foliage distribution using lidar
Three-dimensional mapping of light transmittance and foliage distribution using lidar
The horizontal and vertical distributions of light transmittance were evaluated as a function of foliage distribution using lidar (light detection and ranging) observations for a sugar maple (Acer saccharum) stand in the Turkey Lakes Watershed. Along the vertical profile of vegetation, horizontal slices of probability of light transmittance were derived from an Optech ALTM 1225 instrument's return pulses (two discrete, 15-cm diameter returns) using indicator kriging. These predictions were compared with (i) below canopy (1-cm spatial resolution) transect measurements of the fraction of photosynthetically active radiation (FPAR) and (ii) measurements of tree height. A first-order trend was initially removed from the lidar returns. The vertical distribution of vegetation height was then sliced into nine percentiles and indicator variograms were fitted to them. Variogram parameters were found to vary as a function of foliage height above ground. In this paper, we show that the relationship between ground measurements of FPAR and kriged estimates of vegetation cover becomes stronger and tighter at coarser spatial resolutions. Three-dimensional maps of foliage distribution were computed as stacks of the percentile probability surfaces. These probability surfaces showed correspondence with individual tree-based observations and provided a much more detailed characterization of quasi-continuous foliage distribution. These results suggest that discrete-return lidar provides a promising technology to capture variations of foliage characteristics in forests to support the development of functional linkages between biophysical and ecological studies.
0703-8992
544-555
Todd, K.
6d667390-6b0f-459f-aa48-e9cf8228353f
Csillag, F.
874cdfc3-6852-43e1-8bb5-42334afa812c
Atkinson, P.M.
aaaa51e4-a713-424f-92b0-0568b198f425
Todd, K.
6d667390-6b0f-459f-aa48-e9cf8228353f
Csillag, F.
874cdfc3-6852-43e1-8bb5-42334afa812c
Atkinson, P.M.
aaaa51e4-a713-424f-92b0-0568b198f425

Todd, K., Csillag, F. and Atkinson, P.M. (2003) Three-dimensional mapping of light transmittance and foliage distribution using lidar. Canadian Journal of Remote Sensing: Journal canadien de télédétection, 29 (5), 544-555. (doi:10.5589/m03-021).

Record type: Article

Abstract

The horizontal and vertical distributions of light transmittance were evaluated as a function of foliage distribution using lidar (light detection and ranging) observations for a sugar maple (Acer saccharum) stand in the Turkey Lakes Watershed. Along the vertical profile of vegetation, horizontal slices of probability of light transmittance were derived from an Optech ALTM 1225 instrument's return pulses (two discrete, 15-cm diameter returns) using indicator kriging. These predictions were compared with (i) below canopy (1-cm spatial resolution) transect measurements of the fraction of photosynthetically active radiation (FPAR) and (ii) measurements of tree height. A first-order trend was initially removed from the lidar returns. The vertical distribution of vegetation height was then sliced into nine percentiles and indicator variograms were fitted to them. Variogram parameters were found to vary as a function of foliage height above ground. In this paper, we show that the relationship between ground measurements of FPAR and kriged estimates of vegetation cover becomes stronger and tighter at coarser spatial resolutions. Three-dimensional maps of foliage distribution were computed as stacks of the percentile probability surfaces. These probability surfaces showed correspondence with individual tree-based observations and provided a much more detailed characterization of quasi-continuous foliage distribution. These results suggest that discrete-return lidar provides a promising technology to capture variations of foliage characteristics in forests to support the development of functional linkages between biophysical and ecological studies.

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Published date: 2003

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Local EPrints ID: 14795
URI: http://eprints.soton.ac.uk/id/eprint/14795
ISSN: 0703-8992
PURE UUID: fc9bedb6-6ba7-4168-807c-329cc4d33a4e

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Date deposited: 01 Mar 2005
Last modified: 15 Mar 2024 05:31

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Contributors

Author: K. Todd
Author: F. Csillag
Author: P.M. Atkinson

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