Results 261 to 270 of about 46,667 (304)

Correlates of Urban Forest Canopy Cover

Public Works Management & Policy, 2003
Scientists and managers often use urban forest canopy cover as an indicator of forest health. Furthermore, canopy cover is often the measure communities use to set tree planting goals. Little is known, however, about factors that contribute to variation in canopy cover. We describe canopy cover in 60 urban areas in Central Indiana.
Nikolas C. Heynen, Greg Lindsey
openaire   +1 more source

Characterizing global forest canopy cover distribution using spaceborne lidar [PDF]

Remote Sensing of Environment, 2019
Detailed characterization of global forest dynamics requires accurate measurements of canopy cover beyond estimating the extent of forested area. Passive-optical remote sensing techniques, despite remarkable success in identifying global hotspots of ...
Hao Tang, John Armston, Steven Hancock   +2 more
exaly   +2 more sources

Modeling Percent Tree Canopy Cover

Photogrammetric Engineering & Remote Sensing, 2012
Tree canopy cover is a fundamental component of the landscape, and the amount of cover influences fire behavior, air pollution mitigation, and carbon storage. As such, efforts to empirically model percent tree canopy cover across the United States are a critical area of research.
John W. Coulston, Gretchen G. Moisen, Barry T. Wilson, Mark V. Finco, Warren B. Cohen, C. Kenneth Brewer   +5 more
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Automated Analysis of in Situ Canopy Images for the Estimation of Forest Canopy Cover

Forest Science, 2009
Abstract Forest canopy cover is a commonly used ecological indicator variable, but its reliable estimation in the field with, e.g., the line intersect sampling method is laborious. One alternative for obtaining this information quickly is to sample a larger area of canopy from each prespecified location within a sample plot by using ...
Korhonen, Lauri, Heikkinen, Jaakko
openaire   +1 more source

NATURAL CONVECTION HEAT TRANSFER IN COVERED PLANT CANOPIES

Acta Horticulturae, 1975
Abstract A facility has been designed and constructed to carry out the study of free convection from leaves in a covered plant canopy. The system considered is one with long parallel rows of canopies with finite widths, heights and spacings between them.
M Iqbal, J.A Stoffers
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Forest canopy cover analysis using UAS lidar

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017
Laser pulses of LiDAR are able to penetrate forest canopy and characterize the vertical structure distribution. Forest canopy cover (CC) can be estimated from normalized point cloud (NPC) and canopy height model (CHM). Unmanned aerial system (UAS) LiDAR usually transmits laser pulses with wider scan angles, which would decrease the probability of ...
Qingwang Liu, Shiming Li, Kailong Hu, Yong Pang, Zengyuan Li   +4 more
openaire   +1 more source

The Computation of the Effective Temperature of the Land Surface Covered with Canopy

Applied Mechanics and Materials, 2012
—Surface soil moisture is an important parameter in describing the water and energy exchanges at the land surface/atmosphere interface. Passive microwave remote sensors have great potential for monitoring surface soil moisture over land surface. The objective of this study is going to establish a model for estimating the effective temperature of land ...
null Hongzhang Ma, null Sumei Liu
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The Distribution and Canopy Cover of Woody Species

1995
This chapter analyses the distribution and importance of woody plants in the Sahel and Sudan zones in West Africa (SSWA), according to climatic zones (Sect. 2.1.2), landscape and geomorphological units (Sect. 2.1.3) and land-use types (Sect. 2.1.4). Canopy cover is utilised as the parameter indicating woody species’ importance (Sect. 2.1.5).
Henk Breman, Jan-Joost Kessler
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CANOPY COVER AND SHADE DETERMINATIONS IN RIPARIAN ZONES

Journal of the American Water Resources Association, 2005
: Three instruments commonly used to measure stream canopy cover were evaluated: the clinometer, a modified spherical convex densiometer Model A, and a hemispherical image system. The hemispherical image system was also used to model shade. At each of five locations throughout Oregon, canopy cover above a stream was measured from the center of the ...
Claudia E. Kelley, William C. Krueger
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Rapid Measurement of Crop Canopy Cover

Agronomy Journal, 1990
AbstractStudies of photosynthesis, transpiration, water erosion, and wind erosion can require measurement of crop canopy cover, the percent of the soil surface covered by plant foliage. This study was conducted to evaluate the meter‐stick method and an electronic method of measuring canopy cover for accuracy, speed, and ease of use.
openaire   +1 more source