Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"canopy heights"”.
-
FUSING GEDI LIDAR AND TANDEM-X INSAR OBSERVATIONS FOR IMPROVED FOREST STRUCTURE AND BIOMASS MAPPING
… to improve height estimation from TDX. Forest heights were initially derived from TDX coherence alone as a baseline using the widely used Random Volume over Ground (RVoG) scattering model. Here, assumptions about RVoG parameters – extinction coefficient (σ) and ground-to-volume amplitude ratio …
-
Spatial distribution of canopy gaps in a tropical forest landscape and its influence on the tree community
… In old growth tropical forests, the creation of canopy gaps by one or multiple tree falls is one of the main causes of disturbance and thus potentially one of the main drivers of forest dynamics (Swaine and Whitmore 1988). My thesis focuses on characterizing patterns of gap disturbance across a …
-
Variation in predator communities and anti-predator behaviors of Milne-Edwards' sifakas (Propithecus edwardsi) in southeastern Madagascar
… downward vigilance and more frequently used low canopy heights; these behaviors may increase their vulnerability to recolonizing ground predators. I investigated local ecological knowledge (LEK) of carnivore ecology in communities 0–20 km from continuous forest to explore the potential for such …
-
Tracking Forest Height Growth Over Time with ICESat-2 ATL08
… LiDAR system to estimate along-track ground and canopy heights above the WGS 84 ellipsoid. This mission provides repeat coverage in 100 m data segments across the globe. In this research, we used multiple years of ICESat-2 ATL08 data to identify canopy height growth over time across the forest …
-
Forest Isoprene Emissions: New Insights from a Novel Field Instrument
… trees. The distribution of isoprene within a canopy is poorly understood and existing models do not capture effectively the forest vertical isoprene gradient. The vertical concentration gradient is investigated in a novel measurement campaign over summer 2018 in a temperate forest. …
-
Projected sea level rise and the conservation ecology of the Micronesian Megapode (Megapodius laperouse senex) in Palau, Micronesia
… contained large trees, and 3) exhibited greater canopy heights than the surrounding forest. The subspecies foraged in a non-preferential manner and used all littoral habitat with no apparent influence of dominant plant species composition. Using GIS and the latest spatial data, I modelled the …
-
Large-area forest assessment and monitoring using disparate lidar datasets
… tree height data to generate a large-area canopy height model. A simple linear regression model was developed using two lidar-based metrics as predictors: the 85th percentile of heights of canopy first returns and the coefficient of variation of the heights of canopy first returns. This …
-
Wachstumsraten, Wachstumsmuster und Wachstumsstörungen tropischer Bäume: Analyse von Langzeiteffekten und kurzfristigen Störungen mit Hilfe von Jahrringstudien
… tree along with data about tree and surrounding canopy heights, plus their current levels of liana infestation. We used tree-ring analyses to estimate age and growth rate of trees. Sampled trees and surrounding canopy were taller at the forest interior than at the edge, even though both sampled …
-
Remote Sensing Characterization of Ecosystem Structure and Functional Types to Inform on Biodiversity Conservation in the Lowland Chocó Rainforest
… transitioning class. This chapter addresses how canopy height models developed from structure-from-motion compare to ground-based measurements of canopy structure. Key findings from this chapter establish associations between diurnal LST patterns above the canopy and below-canopy diurnal air …
-
Influencia de la distancia entre filas y de la densidad de pámpanos en el aprovechamiento de los recursos ambientales y en la respuesta del cv. Tempranillo (Vitis vinifera l.), conducido en espaldera con riego deficitario
… being generated by different row distances, canopy heights, and leaf area densities. The decrease of the row distance from 3 to 2 m led to enhancements in the efficiency of radiation interception that were higher than the ones resulting from increasing the canopy height from 0.9 to 1.4 m. And …