2005
DOI: 10.14214/df.6
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The spectral signature of coniferous forests: the role of stand structure and leaf area index

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Cited by 12 publications
(10 citation statements)
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“…Basically measurements at two different heights close to the forest floor are sufficient to determine the power law regression parameter values of individual forest plots. However, because the radiation propagation characteristics of different forest stands vary and there are practical challenges in getting a sufficiently large height difference for the two measurements to achieve reasonable accuracy for the regression, additional Leaf Area Index (LAI) measurements and canopy scattering modeling (Rautiainen andStenberg 2005, Manninen andStenberg 2008) would improve the forest top albedo results. Since LAI is integrally connected to the transmission of radiation through the forest canopy, the experimental albedo gradient results used in conjunction with collocated ground level LAI measurements and advanced scattering models should together enable reliable forest surface albedo estimations.…”
Section: Discussionmentioning
confidence: 99%
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“…Basically measurements at two different heights close to the forest floor are sufficient to determine the power law regression parameter values of individual forest plots. However, because the radiation propagation characteristics of different forest stands vary and there are practical challenges in getting a sufficiently large height difference for the two measurements to achieve reasonable accuracy for the regression, additional Leaf Area Index (LAI) measurements and canopy scattering modeling (Rautiainen andStenberg 2005, Manninen andStenberg 2008) would improve the forest top albedo results. Since LAI is integrally connected to the transmission of radiation through the forest canopy, the experimental albedo gradient results used in conjunction with collocated ground level LAI measurements and advanced scattering models should together enable reliable forest surface albedo estimations.…”
Section: Discussionmentioning
confidence: 99%
“…Monitoring of boreal forests requires observations on a broad scale both temporally and spatially (Boyd and Danson 2005, Rautiainen 2005, Heiskanen 2008). For surface albedo, there exist dedicated instruments for in situ observations (called albedometers and pyranometers), but it is often unpractical to extend in situ measurements into large spatial or temporal datasets.…”
Section: Introductionmentioning
confidence: 99%
“…Spectral features are the specific combination of reflected and absorbed electromagnetic radiation at varying wavelengths which can uniquely identify an object. For example, nearinfrared (NIR) wavelengths have been successful applied to estimating vegetation biophysical properties (Rautiainen, 2005). Active sensors, on the other hand, emit energy in order to scan objects and areas, whereupon a passive sensor then detects and measures the radiation that is reflected or backscattered from the target.…”
Section: Automated Data Processingmentioning
confidence: 99%
“…The dominant method for interpreting vegetation biophysical properties from optical remote sensing data is through spectral vegetation indices. Vegetation indices are combinations of reflectance measured in two or more spectral bands, which aim at estimating canopy biophysical properties through enhancing the spectral contribution of vegetation, while minimizing the contribution of underlying soil or understory vegetation [4].…”
Section: Spectral Properties Of Vegetationmentioning
confidence: 99%