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You searched for id:"oai:dspace.library.uvic.ca:1828/10471". One record found.

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1. Quinn, Geoffrey. Derivation of forest productivity and structure attributes from remote sensing imaging technology.

Degree: Department of Geography, 2019, University of Victoria

There are considerable expenditures by government and private forest industry to enhance the growth of forests and reduce time required for crop rotation. The effectiveness of some of these treatments is dependent on site productivity. In addition, as responsible stewards of the forest resource and habitat, it is important that the state of forests are actively monitored, especially in the face of a changing climate and increased rates of disturbance. This dissertation reports on the development of a method for estimating and mapping forest productivity. The Shawnigan Lake thinning and fertilization forest installation, established in 1971 by CFS, was selected as the study site largely for its rich mensuration history. Square treatment plots were 0.04ha in area and included two thinning levels (1/3 & 2/3 of the basal area), two fertilization treatments (224kg & 448kg N/ha) with repeated fertilizations and macronutrient experiments (S, P) and control plots. A sample of plots was selected for high precision ground based lidar reference surveys. In September of 2012 a multi-sensor airborne survey of SLP was conducted that collected high-density lidar (up to ~70pnts/m2) and VNIR imaging spectroscopy. A thorough empirical radiometric calibration was conducted in addition to a spatial calibration at the Victoria International Airport. A combination of area based height percentile, point density ratios and statistical moments with individual lidar tree metrics including height distribution and proximity metrics were generated. Topographic metrics were also generated from the lidar ground classified point cloud. A library of spectral indices was computed from the imaging spectrometer data, with an emphasis on those indices known to be associated with vegetation health. These metrics were summarized to the plot level for a coarse scale regression analysis. A control survey and ground based lidar was used to facilitate an individual tree based fine scale of analysis, where reference data could unambiguously be matched to airborne collected data through the projected positions. Regression analysis was conducted applying the best subset regression with exhaustive feature selection search criteria and included a critical evaluation of the resulting selected features. Models were investigated considering the data source and in combination, that is, lidar metrics were considered independent of spectroscopy as well as the converse, and lidar metrics in combination with spectral metrics. The contribution of this study is the revelation that existing area based point cloud metrics are highly correlated, potentially noisy and sensitive to variations in point density, resulting in unstable feature selection and coefficients in model building. The approach offered as an alternative is the gridded lidar treetops method, which is evidently lacking within the literature and which this study overwhelmingly advocates. Additionally, the breadth and diversity of metrics assessed, the size and quality of the reference data applied,… Advisors/Committee Members: Niemann, K. O. (supervisor).

Subjects/Keywords: remote sensing; spectroscopy; lidar; forestry; forest productivity; forest inventory; forest structure; lidar treetop; photochemical reflectance index; continuum removal; terrestrial lidar; multi-temporal lidar

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APA (6th Edition):

Quinn, G. (2019). Derivation of forest productivity and structure attributes from remote sensing imaging technology. (Thesis). University of Victoria. Retrieved from https://dspace.library.uvic.ca//handle/1828/10471

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Quinn, Geoffrey. “Derivation of forest productivity and structure attributes from remote sensing imaging technology.” 2019. Thesis, University of Victoria. Accessed January 23, 2019. https://dspace.library.uvic.ca//handle/1828/10471.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Quinn, Geoffrey. “Derivation of forest productivity and structure attributes from remote sensing imaging technology.” 2019. Web. 23 Jan 2019.

Vancouver:

Quinn G. Derivation of forest productivity and structure attributes from remote sensing imaging technology. [Internet] [Thesis]. University of Victoria; 2019. [cited 2019 Jan 23]. Available from: https://dspace.library.uvic.ca//handle/1828/10471.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Quinn G. Derivation of forest productivity and structure attributes from remote sensing imaging technology. [Thesis]. University of Victoria; 2019. Available from: https://dspace.library.uvic.ca//handle/1828/10471

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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