Tools for individual tree analysis

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Presentation transcript:

Tools for individual tree analysis by Andrew Plowright March 9th, 2016 Photo: Jeremy Koreski

Outline Tools for individual tree analysis Introduction to individual tree analysis Development of open-source tools Demonstration of a typical analysis Where to get it

Individual tree detection Tools for individual tree analysis Two approaches to LiDAR Area-based analysis Individual tree detection

Advantages of individual tree analysis Tools for individual tree analysis Advantages of individual tree analysis Measuring trees directly instead of making inferences Directly measurable metrics: Tree height Crown width Crown volume Individual tree point clouds

Applications for FLNRO Tools for individual tree analysis Applications for FLNRO BC inventory moving away from one size fits all Individual tree data can be upscaled Audit existing inventory Keep up with remote sensing research

Creation of the ForestTools library Tools for individual tree analysis Creation of the ForestTools library Open-source library in R Main functions: Treetop detection Crown delineation Spatial statistics Examples and documentation

Treetop detection Tools for individual tree analysis Many existing algorithms Recognize the shape of a distinct tree Errors: Commission Omission

Variable window filter Tools for individual tree analysis Variable window filter Moving window looks for peaks in the canopy Dynamic window size adapts to height of the canopy Computationally fast Requires few parameters Only detects dominant trees

Analysis workflow Tools for individual tree analysis Canopy height model Dominant treetops

Outlining tree crowns Tools for individual tree analysis Watershed segmentation algorithm Originally developed to outline drainage basin Canopy height model Inverted canopy height model Valleys are “filled” until boundaries are identified

Outlining tree crowns Tools for individual tree analysis Potential issue: oversegmentation Controlled using markers (i.e.: location of treetops)

Analysis workflow Tools for individual tree analysis Canopy height model Dominant treetops Tree crowns

Spatial statistics Tools for individual tree analysis Get tree counts (density maps) Summarize statistics (tree height, crown diameter, etc.) Within polygons (i.e.: management units) Within a grid

Tools for individual tree analysis Dominant treetops Tree crowns Tree count Mean crown diameter

How to access ForestTools Tools for individual tree analysis How to access ForestTools Install directly from R: install.packages(“ForestTools”) Online manual Guided analysis Source code is on Github Alternatives: Spatial Analyst extension for ArcGIS Image processing toolbox in MATLAB FUSION tools for LiDAR

Thank you! Andrew Plowright, M.Sc. Contact information plowright.andrew@gmail.com andrew.plowright@gov.bc.ca Photo: Jeremy Koreski