Singie PCT t-Band far jV
Figure 2c: Tomogram along Azimuth (3)
x}
Figure 3a: Tomogram along Range (A)
Sigue PCT L-Band for jy
"ge Wr
Figure 3b: Tomogram along Range (B)
Sige POT L-Band tne Hy
QE
Figure 3c: Tomogram along Range (C)
The tomograms of the forested patches indicate scattering
occurring relatively uniformly throughout the canopy. In
contrast, the regrowth areas show more intense scattering from
the ground area than the upper canopy. This may reflect the
presence of more ‘double-bounce’ contributions from the lower
portion of the canopy.
At this point there is no direct *truth' with which to make a
comparison of radar structure function. However it should be
noted that the forest patches are relatively homogeneous such
that it would be surprising to see large tomographic variations
across this data set. A scene containing mixed species will be
addressed shortly.
5. CONCLUSIONS
The worldwide destruction of forest as a source of CO2
emissions into the atmosphere is a major driver for attempts to
determine the existing forest biomass content with increasing
accuracy and spatial resolution. In previous work it has been
shown that derivation of forest height using POLInSAR
methods, together with use of an allotropic expression relating
height to forest biomass could produce good results in the
context of relatively homogeneous forests. In this paper we
provide extensions to that work, utilizing a technique whereby
3D tomograms can be determined using a data set from an
airborne, single-baseline, L-Band polarimetric InSAR system.
The longer-term objective is to demonstrate that knowledge of
the canopy structure function will allow for biomass
differentiation in non-homogeneous forests. In this paper we
show the first tomograms in the same forest area used for the
previously noted biomass extraction. These examples show,
qualitatively at least, that structural variation does occur even in
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia
the relatively homogeneous lodgepole pine forest test area
being addressed.
Our study will be extended to various forest types in Canada
and is expected to be applicable in various forest types over
different tropical regions as well. Additionally, a novel dual
baseline approach using the same system will be examined to
determine if the expected improvement in structure function
resolution can be achieved. Lastly, classification algorithms
relating biomass to the structure function information will be
developed and tested.
6. ACKNOWLEDGMENTS
The authors would like to acknowledge Alberta Innovates
Technology Futures for funding this research. We are
particularly grateful to Intermap Technologies Corp., Calgary,
for providing the invaluable data and technical support.
7. REFERENCES
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