Estimation of leaf area index and canopy openness in broad-leaved forest using an airborne laser scanner in comparison with high-resolution near-infrared digital photography

Techniques are developed to estimate stand leaf area index using high-resolution airborne spectral imagery. Leaf area index on 8 m radius plots was found to be strongly related to the normalized ratio of wavelengths in the red (674–687 nm) and near infrared (751–755 nm) part of the spectrum. Data from 17 stands were used. Leaf area index estimates included both the overstory (Douglas-fir, Pseudotsugamenziesii Mirb. (Franco)) and the understory (salal, Gaultheriashallon Pursh) over a range of stem densities.

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Vertical integration of leaf area index in a Japanese deciduous broad-leaved forest

Agricultural and Forest Meteorology ◽

10.1016/j.agrformet.2008.02.011 ◽

2008 ◽

Vol 148 (6-7) ◽

pp. 1136-1146 ◽

Cited By ~ 65

Author(s):

Kenlo Nishida Nasahara ◽

Hiroyuki Muraoka ◽

Shin Nagai ◽

Hiroaki Mikami

Keyword(s):

Leaf Area Index ◽

Leaf Area ◽

Vertical Integration ◽

Area Index ◽

Broad Leaved Forest ◽

Leaved Forest

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High-resolution hydrographic airborne laser scanner for surveying inland waters and shallow coastal zones

10.1117/12.883910 ◽

2011 ◽

Cited By ~ 7

Author(s):

Martin Pfennigbauer ◽

Andreas Ullrich ◽

Frank Steinbacher ◽

Markus Aufleger

Keyword(s):

High Resolution ◽

Laser Scanner ◽

Inland Waters ◽

Coastal Zones ◽

Airborne Laser Scanner ◽

Airborne Laser

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Constructing high resolution DEMs from airborne laser scanner data

ASEG Extended Abstracts ◽

10.1071/aseg2001ab136 ◽

2001 ◽

Vol 2001 (1) ◽

pp. 1-4 ◽

Cited By ~ 2

Author(s):

Peter M Stone ◽

Andrew Simsky

Keyword(s):

High Resolution ◽

Laser Scanner ◽

Scanner Data ◽

Airborne Laser Scanner ◽

Airborne Laser

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Estimation of Vegetation-Induced Flow Resistance for Hydraulic Computations Using Airborne Laser Scanning Data

Water ◽

10.3390/w13131864 ◽

2021 ◽

Vol 13 (13) ◽

pp. 1864

Author(s):

Peter Mewis

Keyword(s):

Laser Scanning ◽

Flow Resistance ◽

Laser Scanner ◽

Airborne Laser Scanning ◽

Density Parameter ◽

Vegetation Density ◽

Airborne Laser Scanner ◽

Airborne Laser ◽

Bed Roughness ◽

Available Information

The effect of vegetation in hydraulic computations can be significant. This effect is important for flood computations. Today, the necessary terrain information for flood computations is obtained by airborne laser scanning techniques. The quality and density of the airborne laser scanning information allows for more extensive use of these data in flow computations. In this paper, known methods are improved and combined into a new simple and objective procedure to estimate the hydraulic resistance of vegetation on the flow in the field. State-of-the-art airborne laser scanner information is explored to estimate the vegetation density. The laser scanning information provides the base for the calculation of the vegetation density parameter ωp using the Beer–Lambert law. In a second step, the vegetation density is employed in a flow model to appropriately account for vegetation resistance. The use of this vegetation parameter is superior to the common method of accounting for the vegetation resistance in the bed resistance parameter for bed roughness. The proposed procedure utilizes newly available information and is demonstrated in an example. The obtained values fit very well with the values obtained in the literature. Moreover, the obtained information is very detailed. In the results, the effect of vegetation is estimated objectively without the assignment of typical values. Moreover, a more structured flow field is computed with the flood around denser vegetation, such as groups of bushes. A further thorough study based on observed flow resistance is needed.

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