Abstract
Mutual shading of needles in coniferous shoots and small-scale variations in needle area density both within and between shoots violate conventional assumptions used in the definition of the elementary volume in radiative transfer models. In this paper, we test the hypothesis if it is possible to scale needle spectral albedo up to shoot spectral albedo using only one structural parameter: the spherically averaged shoot silhouette to total area ratio (STAR). To test the hypothesis, we measured both structural and spectral properties of ten Scots pine (Pinus sylvestris) shoots and their needles. Our results indicate that it is possible to upscale from needle to shoot spectral albedo using STAR. The upscaling model performed best in the VIS and SWIR regions, and for shoots with high STAR values. As STAR is linearly related to photon recollision probability, it is also possible to apply the upscaling model as integral part of radiative transfer models.
| Original language | English |
|---|---|
| Pages (from-to) | 469-474 |
| Number of pages | 6 |
| Journal | Remote Sensing of Environment |
| Volume | 117 |
| DOIs | |
| Publication status | Published - 15 Feb 2012 |
| MoE publication type | A1 Journal article-refereed |
Funding
We wish to thank D. Markulin for assisting in the set-up of the experiment and Pauline Stenberg for fruitful scientific discussions. Our study was funded by the Academy of Finland , University of Helsinki Postdoctoral Funds , and the EC (ECOCHANGE, GOCE-036866 ).
Keywords
- Photon recollision probability
- Pinus sylvestris
- Spectral invariants
- STAR
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