Global ETD Search

61	LiDAR and WorldView-2 Satellite Data for Leaf Area Index Estimation in the Boreal Forest Pope, Graham 25 September 2012 (has links) Leaf Area Index (LAI) is an important input variable for forest ecosystem modeling as it is a factor in predicting productivity and biomass, two key aspects of forest health. Current in situ methods of determining LAI are sometimes destructive and generally very time consuming. Other LAI derivation methods, mainly satellite-based in nature, do not provide sufficient spatial resolution or the precision required by forest managers. This thesis focused on estimating LAI from: i) height and density metrics derived from Light Detection and Ranging (LiDAR); ii) spectral vegetation indices (SVIs), in particular the Normalized Difference Vegetation Index (NDVI); and iii) a combination of these two remote sensing technologies. In situ measurements of LAI were calculated from digital hemispherical photographs (DHPs) and remotely sensed variables were derived from low density LiDAR and high resolution WorldView-2 data. Multiple Linear Regression (MLR) models were created using these variables, allowing forest-wide prediction surfaces to be created. Results from these analyses demonstrated: i) moderate explanatory power (i.e., R2 = 0.54) for LiDAR models incorporating metrics that have proven to be related to canopy structure; ii) no relationship when using SVIs; and iii) no significant improvement of LiDAR models when combining them with SVI variables. The results suggest that LiDAR models in boreal forest environments provide satisfactory estimations of LAI, even with low ranges of LAI for model calibration. On the other hand, it was anticipated that traditional SVI relationships to LAI would be present with WorldView-2 data, a result that is not easily explained. Models derived from low point density LiDAR in a mixedwood boreal environment seem to offer a reliable method of estimating LAI at a high spatial resolution for decision makers in the forestry community. / Thesis (Master, Geography) -- Queen's University, 2012-09-24 16:18:09.96 Remote Sensing Forestry Leaf Area Index Boreal Forest Regression LiDAR
62	Conservation and ecology of bryophytes in partially harvested boreal mixed-wood forests of west-central Canada Caners, Richard T. Unknown Date No description available. Boreal Bryophyte Diaspore Disturbance Forest Liverwort Moss Retention Variable
63	Bioacoustic analyses of the chick-a-dee call of the Mexican chickadee (Poecile sclateri) and the boreal chickadee (Poecile hudsonica) Moscicki, Michele Unknown Date No description available. Chick-a-dee Call Bioacoustics Vocal Communication Mexican Chickadee Boreal Chickadee
64	The use of small ephemeral wetlands and streams by amphibians in the mixedwood forest of boreal Alberta Okonkwo, Godwin Unknown Date No description available. small ephemeral wetlands small streams amphibian habitat Boreal Alberta
65	The Short-term Impacts of Aspen Clear-cutting on Upland Groundwater Recharge / Clear-cutting Impacts on Groundwater Recharge Hairabedian, Melissa Manuella Unknown Date No description available. Clear-cutting Recharge Aspen Boreal Plain Alberta Upland Groundwater
66	The potential of forest floor transfer for the reclamation of boreal forest understory plant communities Fair, Jordana Michelle Unknown Date No description available. reclamation understory forest floor boreal forest salvage depth
67	Influence of forest canopies on the deposition of methylmercury to boreal ecosystem watersheds Mowat, Linnea Unknown Date No description available. mercury methylmercury wet-deposition dry-deposition boreal canopy photoreduction
68	The effects of underplanted white spruce on understory environment and vegetation in aspen-dominated stands of the western boreal forest Graham, Erica E. Unknown Date No description available. underplanting white spruce understory vegetation boreal forest aspen
69	Natural Recovery of Upland Boreal Forest Vegetation on a Hummocky Peat-Mineral Mix Substrate in the Athabasca Oil Sands Region, Alberta Shaughnessy, Brenda Erin Unknown Date No description available. natural recovery land reclamation oil sands boreal forest
70	Interactions between the forest tent caterpillar (Malacosoma disstria Hubner) and its natural enemies: the effects of forest composition and implications for outbreak spread Nixon, Amy E Unknown Date No description available. forest tent caterpillar outbreak boreal mixedwood predation parasitism population dynamics

Search results