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.
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Showing 1 to 20 of 204 for “"Canopy Cover"”.
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Methods for the spatial modeling and evalution of tree canopy cover
Tree canopy cover is an essential measure of forest health and productivity, which is widely studied due to its relevance to many disciplines. For example, declining tree canopy cover can be an indicator of forest health, insect infestation, or disease. This dissertation consists of three studies, …
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Tree Canopy Cover Response to Land Development Policies in Fairfax County
Urban tree canopy cover is important because it mitigates negative impacts of urbanization such as urban heat and stormwater. Land development leads to canopy loss through tree removal, but some localities have regulations in place that require trees to be retained or replanted during development. …
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Effects of canopy cover on the landscape epidemiology of an amphibian chytrid fungus
… wetland temperatures should vary with forest canopy cover in heterogeneous landscapes. However, few studies have examined the relationship between Bd prevalence and canopy cover. I sampled anurans for Bd at 33 wetlands in east-central Illinois representing a gradient in canopy cover. I …
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Do trees suppress grass fuel loads? : canopy cover effects in South African savannas
… biome indicated that fire did not spread at tree canopy cover above 40%. This study investigates this relationship in a field study. It is possible that the type of tree (forest vs. savanna) may influence the amount of shade experienced by the understory and therefore this study also explores …
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Combined effects of water chemistry, canopy cover, and stream size on benthic macroinvertebrates along a Central Appalachian stream continuum
… if localized variation in alkalinity and canopy cover would modify stream continuum predictions. Localized variation in alkalinity and canopy cover significantly affected macroinvertebrate structure and function and modified stream continuum predictions. Results indicated that alkalinity …
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Validating Leaf Area Index (LAI) and canopy cover estimated from satellite imagery products with ground measurements in plum orchards, Western Cape
… Area Index (LAI) plays a central role in linking canopy structure to productivity. LAI is not only a key indicator of crop development and yield potential but also a critical input in biophysical and climatic models. However, direct measurement of LAI remains laborious, costly, and impractical for …
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Applications of deep learning and computer vision in large scale quantification of tree canopy cover and real-time estimation of street parking
… to image and video data to quantify urban tree cover and street parking utilization. Large-scale and accurate quantification of urban tree cover is important towards informing government agencies in their public greenery efforts, and useful for modelling and analyzing city ecology and urban heat …
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Effects of Canopy Cover and Impervious Surface Cover on Occurrence of Coyotes (Canis latrans) and Gray Foxes (Urocyon cinereoargenteus) throughout the United States
… spatial scales. My study examined the effect of canopy cover, presumably an important component of natural habitat, and impervious surface cover as an indicator of urbanization, on the occurrence of coyotes and gray foxes. Additionally, I determined whether associations with canopy cover and …
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Assessing Efficacy of Restoration Treatments in Juniper Savannas using Spatial Wavelets and Dot Grids on Aerial Photography
… been used to stall this expansion and reduce canopy-cover. This study utilizes and compares two techniques – dot- grid sampling and spatial wavelet analysis (SWA) – to estimate the efficacy of these treatments by measuring canopy-cover change pre-and post-treatment. Further, using the SWA …
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Assessing Efficacy of Restoration Treatments in Juniper Savannas using Spatial Wavelets and Dot Grids on Aerial Photography
… been used to stall this expansion and reduce canopy-cover. This study utilizes and compares two techniques – dot- grid sampling and spatial wavelet analysis (SWA) – to estimate the efficacy of these treatments by measuring canopy-cover change pre-and post-treatment. Further, using the SWA …
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Birds in Residential Metropolitan New Orleans Neighborhoods and Their Relationships to the Batture and Yard Vegetation
… responded to distance from the batture, percent canopy cover, stem counts, and understory vegetation. Surveys were conducted in the spring and summer of 2010. It was found that batture birds, urban birds, and pooled birds all had greater species richness and abundance in the spring in areas with …
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Habitat Selection By Female White-Tailed Deer in the Northern Black Hills, South Dakota and Wyoming
… forests that contained > 70% overstory canopy cover. Closed stands of both mature and immature pine also were selected, indicating that canopy cover influenced selection in those habitats in winter. Spruce (Picea glauca), aspen/beaked hazel/spiraea (Populus tremuloides/Corylus …
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MEASURING AND MAPPING FOREST WILDLIFE HABITAT CHARACTERISTICS USING LIDAR REMOTE SENSING AND MULTI-SENSOR FUSION
… field-based and emphasize the important of canopy cover. However, this is more because of convenience than because canopy cover is a definitive predictor of owl presence or fecundity. Canopy cover is consistently and accurately measured in the field using a moosehorn densitometer; comparable …
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Vegetation structure and inferred patterns of functional group attrition in a shrub encroached old field and tallgrass prairie mosaic
… of species and functional group richness and cover in a tallgrass prairie:old field mosaic with varying levels of shrub invasion and assess whether there are ordered patterns of loss in richness and cover with increasing shrub canopy cover. Ground layer and shrub layer data were collected from …
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Gopher tortoise nest-site selection at burrows and the influence of nest environment on hatching success
… how the environment around potential nest sites (canopy, understory, and soil) influences gopher tortoise nest-site selection at burrows and 2) how that nest environment both directly (nest microclimate: temperature and moisture) and indirectly (nest characteristics: nest depth, distance from …
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Fire effects on small mammals and vegetation of the Northern Chihuahuan Desert
… reduced shmb (P = '» 006) and grass (P < 0.000) canopy cover to 64 and 16% of the preburn cover, respectively Complete recovery' of the canopy cover had not taken place 1 year post bum Densities of shrubs, primarily creosotebush. tarbush (Flourencia cemua). and cacti species (Opuntia) were …
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Habitat Selection of a Declining White-tailed Deer Herd in the Central Black Hills, South Dakota and Wyoming
… (Pinus ponderosa) deciduous and burned pine cover types. Overstory-understory habitats selected included pine/grass-forb, pine/bearberry (Arctostaphylos uva-ursi), pine/snowbeny (Symphoricarpos albus), burned pine/grass-forb, and pine/shrub habitats. Structural stages selected included …
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Habitat Selection of White-tailed and Mule Deer in the Southern Black Hills, South Dakota
… (Pinus ponderosa) dominated habitats with > 40% canopy cover and a grass-forb understory. All white-tailed deer avoided ponderosa pine/mountain mahogany/Rocky Mountain juniper (Pinus ponderosa/Cercocarpus montanus/Juniper scopu/orum) and burned ponderosa pine dominated habitats. During winter, …
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Assessing Black-capped Vireo (Vireo atricapillus) Breeding Habitat based on Size, Spatial Distribution, and Plant Species in Shrub Mottes at Kerr Wildlife Management Area, Texas
… areas with greater heterogeneity in vegetative cover. Vegetative cover in BCV habitat is composed of low deciduous shrubs with lateral branching to the ground. Openness, or distance between shrubs, is another important feature of heterogeneity as well as BCV habitat. The objective of my study …
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