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Keyword: spatial statistics

Visualization of heterogeneous forest structures following treatment in the southern Rocky Mountains

Publications Posted on: September 21, 2017
Manipulation of forest spatial patterns has become a common objective in restoration prescriptions throughout the central and southern Rocky Mountain dry-mixed conifer forest systems. Pre-Euro-American settlement forest reconstructions indicate that frequent-fire regimes developed forests with complex mosaics of individual trees, tree clumps of varying size, and openings.

Use of Fouler Transforms to define landscape scales of analysis for disturbances: A case study of thinned and unthinned forest stands

Publications Posted on: May 29, 2015
Various disturbances such as disease and management practices cause canopy gaps that change patterns of forest stand structure. This study examined the usefulness of digital image analysis using aerial photos, Fourier Tranforms, and cluster analysis to investigate how different spatial statistics are affected by spatial scale.

Characterizing the canopy gap structure of a disturbed forest using Fourier transform

Publications Posted on: May 29, 2015
Diseases and other small-scale disturbances alter spatial patterns of heterogeneity in forests by killing trees. Canopy gaps caused by tree death are a common feature of forests. Because gaps are caused by different disturbances acting at different times and places, operationally determining the locations of gap edges is often difficult.

Spatial statistical modeling tools for streams

Documents and Media Posted on: January 23, 2015
Stream network structure, connectivity, and flow direction strongly affect spatial patterns in stream attributes. Most statistical analyses ignore network structure and may provide biased results for stream data. Key Findings:Document Type: Briefing Papers

Modelling dendritic ecological networks in space: An integrated network perspective

Publications Posted on: April 29, 2013
Dendritic ecological networks (DENs) are a unique form of ecological networks that exhibit a dendritic network topology (e.g. stream and cave networks or plant architecture). DENs have a dual spatial representation; as points within the network and as points in geographical space.

Utility of computer simulations in landscape genetics

Publications Posted on: December 07, 2010
Population genetics theory is primarily based on mathematical models in which spatial complexity and temporal variability are largely ignored. In contrast, the field of landscape genetics expressly focuses on how population genetic processes are affected by complex spatial and temporal environmental heterogeneity.

Relationships between migration rates and landscape resistance assessed using individual-based simulations

Publications Posted on: December 07, 2010
Linking landscape effects on gene flow to processes such as dispersal and mating is essential to provide a conceptual foundation for landscape genetics. It is particularly important to determine how classical population genetic models relate to recent individual-based landscape genetic models when assessing individual movement and its influence on population genetic structure.