Impacts of radiometric corrections on empirical modelling of biophysical variables with airborne multispectral digital camera imagery
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- Abstract
Modelling forest attributes using empirical remote sensing methods can be affected
by variations in image brightness within individual images. This research evaluates
how distortions in high-resolution colour infrared (CIR) airborne imagery influence
the empirical modelling of biophysical variables. The main research objectives were
to: 1) correct variations in image brightness of airborne multispectral data caused by
bi-directional reflectance variation, topography, and optical light fall-off, and 2)
compare stepwise regression models of field measured forest variables derived from
raw image spectral and texture data versus models derived from corrected image
spectral and texture image data. Biophysical measurements of forest structure and
health were made in the Gatineau Park northwest of Ottawa, Canada, which is an area
of unmanaged temperate hardwood forest on the southern edge of the Canadian
Shield. Regression models produced for average diameter at breast height (DBH),
basal area and effective leaf area index (ETAI) improved using image data corrected
for bi-directional variation and light fall-off. ELAI models improved with the
correction of image brightness caused by topographic variations. This research
provides a first step towards understanding how regression based biophysical models
of forest structure and health derived from image spectral and texture information
change with the reduction of image brightness distortions.
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- Rights Notes
Copyright © 2006 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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- 2006
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