Search results for: Trisalyn A. Nelson

Items from 1 to 20 out of 35 results

article

Comparing citizen science reports and systematic surveys of marine mammal distributions and densities

Gillian K.A. Harvey, Trisalyn A. Nelson, Paul C. Paquet, Colin J. Ferster, more

Biological Conservation > 2018 > 226 > C > 92-100

Citizen science observations represent a significant and growing source of species and ecosystem knowledge. These data have potential to support traditional surveys. Databases of citizen observations of wildlife are growing, but how to use this information for scientific purposes is less clear owing to uncertainty in sampling distribution and data quality. In this study, we demonstrate how mapping...

article

The positive effects of increased foot patrols on the incidence of liquor infractions and assaults in the Granville Street Entertainment Area of Vancouver British Columbia Canada

Jessica L. Fitterer, Trisalyn A. Nelson, Timothy Stockwell

Applied Geography > 2017 > 87 > C > 97-105

Entertainment districts have high crime rates. Offences peak on the weekend during the operating hours of on-premises drinking establishments. To determine if proactive policing from May 1st to August 31st reduced the spatial density (kernel) or annual frequency of liquor infractions and assaults in Vancouver British Columbia Granville St. Entertainment Area (GEA) we analyzed the spatial and temporal...

article

Spatiotemporal patterns of paralytic shellfish toxins and their relationships with environmental variables in British Columbia, Canada from 2002 to 2012

Stephen Finnis, Nikolas Krstic, Lorraine McIntyre, Trisalyn A. Nelson, more

Environmental Research > 2017 > 156 > C > 190-200

Harmful algal blooms produce paralytic shellfish toxins that accumulate in the tissues of filter feeding shellfish. Ingestion of these toxic shellfish can cause a serious and potentially fatal condition known as paralytic shellfish poisoning (PSP). The coast of British Columbia is routinely monitored for shellfish toxicity, and this study uses data from the monitoring program to identify spatiotemporal...

article

Multiuse trail intersection safety analysis: A crowdsourced data perspective

Ben Jestico, Trisalyn A. Nelson, Jason Potter, Meghan Winters

Accident Analysis & Prevention > 2017 > 103 > C > 65-71

Real and perceived concerns about cycling safety are a barrier to increased ridership in many cities. Many people prefer to bike on facilities separated from motor vehicles, such as multiuse trails. However, due to underreporting, cities lack data on bike collisions, especially along greenways and multiuse paths. We used a crowdsourced cycling incident dataset (2005–2016) from BikeMaps.org for the...

article

Characterizing spatial-temporal patterns of landscape disturbance and recovery in western Alberta, Canada using a functional data analysis approach and remotely sensed data

Mathieu L. Bourbonnais, Trisalyn A. Nelson, Gordon B. Stenhouse, Michael A. Wulder, more

Ecological Informatics > 2017 > 39 > C > 140-150

Landscape regionalization approaches are frequently used to summarize and visualize complex spatial patterns, environmental factors, and disturbance regimes. However, landscapes are dynamic and contemporary regionalization approaches based on spatial patterns often do not account for the temporal component that may provide important insight on disturbance, recovery, and how ecological processes change...

article

Data-driven regionalization of forested and non-forested ecosystems in coastal British Columbia with LiDAR and RapidEye imagery

Shanley D. Thompson, Trisalyn A. Nelson, Ian Giesbrecht, Gordon Frazer, more

Applied Geography > 2016 > 69 > C > 35-50

Traditionally, forest inventory and ecosystem mapping at local to regional scales rely on manual interpretation of aerial photographs, based on standardized, expert-driven classification schemes. These current approaches provide the information needed for forest ecosystem management but constrain the thematic and spatial resolution of mapping and are infrequently repeated. The goal of this research...

article

Mapping areas of spatial-temporal overlap from wildlife tracking data

Jed A. Long, Stephen L. Webb, Trisalyn A. Nelson, Kenneth L. Gee

Movement Ecology > 2015 > 3 > 1 > 1-14

Background The study of inter-individual interactions (often termed spatial-temporal interactions, or dynamic interactions) from remote tracking data has focused primarily on identifying the presence of such interactions. New datasets and methods offer opportunity to answer more nuanced questions, such as where on the landscape interactions occur. In this paper, we provide a new approach for mapping...

article

Indicators of vegetation productivity under a changing climate in British Columbia, Canada

Keith R. Holmes, Nicholas C. Coops, Trisalyn A. Nelson, Fabio M.A. Fontana, more

Applied Geography > 2015 > 56 > Complete > 135-144

Understanding the relationship between vegetation and climate is essential for predicting the impact of climate change on broad-scale landscape processes. Utilizing vegetation indicators derived from remotely sensed imagery, we present an approach to forecast shifts in the future distribution of vegetation. Remotely sensed metrics representing cumulative greenness, seasonality, and minimum cover have...

article

Evaluation of different radon guideline values based on characterization of ecological risk and visualization of lung cancer mortality trends in British Columbia, Canada

Michael C. Branion-Calles, Trisalyn A. Nelson, Sarah B. Henderson

BMC Public Health > 2015 > 15 > 1 > 1-13

Background There is no safe concentration of radon gas, but guideline values provide threshold concentrations that are used to map areas at higher risk. These values vary between different regions, countries, and organizations, which can lead to differential classification of risk. For example the World Health Organization suggests a 100 Bq m⁻³value, while Health Canada recommends 200 Bq m⁻³. Our...

article

A critical examination of indices of dynamic interaction for wildlife telemetry studies

Jed A. Long, Trisalyn A. Nelson, Stephen L. Webb, Kenneth L. Gee, more

Journal of Animal Ecology > 83 > 5 > 1216 - 1233

Wildlife scientists continue to be interested in studying ways to quantify how the movements of animals are interdependent – dynamic interaction. While a number of applied studies of dynamic interaction exist, little is known about the comparative effectiveness and applicability of available methods used for quantifying interactions between animals.We highlight the formulation, implementation and...

article

Assessing coastal species distribution models through the integration of terrestrial, oceanic and atmospheric data

Gregory J. M. Rickbeil, Nicholas C. Coops, Mark C. Drever, Trisalyn A. Nelson, more

Journal of Biogeography > 41 > 8 > 1614 - 1625

AimWhen considering multiple species in distribution models, environmental variables should be selected that describe the group of species' environmental requirements. This can, however, be challenging in locations such as coastal areas, where different species may respond to terrestrial, oceanic and/or atmospheric conditions. Here, we evaluate the use of remotely sensed (RS) terrestrial, oceanic...

article

Geographic analysis of the impacts of mountain pine beetle infestation on forest fire ignition

Mathieu L. Bourbonnais, Trisalyn A. Nelson, Michael A. Wulder

The Canadian Geographer / Le Géographe canadien > 58 > 2 > 188 - 202

In British Columbia, Canada, the largest mountain pine beetle outbreak on record has resulted in changes to fuel complexes that may alter fire regimes. The goal of this study is to analyze the relative importance of mountain pine beetle infestations as a determinant of forest fire ignition density in British Columbia. Fire ignitions data for the years 2000 to 2007 were modelled with covariates (weather,...

article

Assessing conservation regionalization schemes: employing a beta diversity metric to test the environmental surrogacy approach

Gregory J. M. Rickbeil, Nicholas C. Coops, Margaret E. Andrew, Douglas K. Bolton, more

Diversity and Distributions > 20 > 5 > 503 - 514

AimSystematic conservation planning often involves the application of a regionalization scheme, which is assumed to delineate distinct ecological communities of target species. Commonly, such schemes are constructed using environmental surrogates; however, their effectiveness with regard to community delineation has been questioned in previous studies. Here, we aim to assess multiple environmental...

article

Oil and gas infrastructure and the spatial pattern of grizzly bear habitat selection in Alberta, Canada

Karen Laberee, Trisalyn A. Nelson, Benjamin P. Stewart, Tracy McKay, more

The Canadian Geographer / Le Géographe canadien > 58 > 1 > 79 - 94

Oil and gas development is increasing in areas of Alberta, Canada that are also home to threatened grizzly bear (Ursus arctos) populations. While impacts of forest disturbances on bears have been heavily studied, research on the impacts of oil and gas activities is limited. Our research goal was to test the hypothesis that grizzly bears select locations of oil and gas development randomly, using grizzly...

article

Assessing Quality of Spatial Models Using the Structural Similarity Index and Posterior Predictive Checks

Colin Robertson, Jed A. Long, Farouk S. Nathoo, Trisalyn A. Nelson, more

Geographical Analysis > 46 > 1 > 53 - 74

Model assessment is one of the most important aspects of statistical analysis. In geographical analysis, models represent spatial processes, where variability in mapped output results from uncertainty in parameter estimates. Slight spatial misalignments can cause inflated error scores when comparing maps of observed and predicted variables using traditional error metrics at the level of individual...

article

A GIS-based risk rating of forest insect outbreaks using aerial overview surveys and the local Moran's I statistic

Christopher Bone, Michael A. Wulder, Joanne C. White, Colin Robertson, more

Applied Geography > 2013 > 40 > Complete > 161-170

The objective of this study is to provide an approach for assessing the short-term risk of mountain pine beetle Dendroctonus ponderosae Hopkins (Coleoptera: Scolytidae) attack over large forested areas based on the spatial-temporal behavior of beetle spread. This is accomplished by integrating GIS, aerial overview surveys, and local indicators of spatial association (LISA) in order to measure the...

article

Measuring Dynamic Interaction in Movement Data

Jed A. Long, Trisalyn A. Nelson

Transactions in GIS > 17 > 1 > 62 - 77

The emergence of technologies capable of storing detailed records of object locations has presented scientists and researchers with a wealth of data on object movement. Yet analytical methods for investigating more advanced research questions from such detailed movement datasets remain limited in scope and sophistication. Recent advances in the study of movement data has focused on characterizing...

article

Ecosystem classifications based on summer and winter conditions

Margaret E. Andrew, Trisalyn A. Nelson, Michael A. Wulder, George W. Hobart, more

Environmental Monitoring and Assessment > 2013 > 185 > 4 > 3057-3079

Ecosystem classifications map an area into relatively homogenous units for environmental research, monitoring, and management. However, their effectiveness is rarely tested. Here, three classifications are (1) defined and characterized for Canada along summertime productivity (moderate-resolution imaging spectrometer fraction of absorbed photosynthetically active radiation) and wintertime snow conditions...

article

Quantifying spatial–temporal patterns in wildlife ranges using STAMP: A grizzly bear example

Mary Smulders, Trisalyn A. Nelson, Dennis E. Jelinski, Scott E. Nielsen, more

Applied Geography > 2012 > 35 > 1-2 > 124-131

Geographical spatial analysis approaches are ideally applied to studies of wildlife habitat use when spatial data, such as telemetry data or spatial ranges, are available. For instance, it is often desirable to quantify spatial–temporal patterns of home ranges, which are typically delineated as polygons and represent areas of habitat that support wildlife functions. Changes to home ranges over time...

article

Modelling the ecosystem indicators of British Columbia using Earth observation data and terrain indices

Jessica L. Fitterer, Trisalyn A. Nelson, Nicholas C. Coops, Michael A. Wulder

Ecological Indicators > 2012 > 20 > Complete > 151-162

Remotely sensed data plays a critical role by acquiring data on ecological conditions over broad spatial scales, providing important information for mapping landscape-scale ecosystem characteristics. The goal of our research is to employ a robust clustering algorithm to provide a transparent method of integrating remotely sensed datasets into homogeneous ecosystem units for conservation planning and...

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Search results for: Trisalyn A. Nelson

Comparing citizen science reports and systematic surveys of marine mammal distributions and densities

The positive effects of increased foot patrols on the incidence of liquor infractions and assaults in the Granville Street Entertainment Area of Vancouver British Columbia Canada

Spatiotemporal patterns of paralytic shellfish toxins and their relationships with environmental variables in British Columbia, Canada from 2002 to 2012

Multiuse trail intersection safety analysis: A crowdsourced data perspective

Characterizing spatial-temporal patterns of landscape disturbance and recovery in western Alberta, Canada using a functional data analysis approach and remotely sensed data

Data-driven regionalization of forested and non-forested ecosystems in coastal British Columbia with LiDAR and RapidEye imagery

Mapping areas of spatial-temporal overlap from wildlife tracking data

Indicators of vegetation productivity under a changing climate in British Columbia, Canada

Evaluation of different radon guideline values based on characterization of ecological risk and visualization of lung cancer mortality trends in British Columbia, Canada

A critical examination of indices of dynamic interaction for wildlife telemetry studies

Assessing coastal species distribution models through the integration of terrestrial, oceanic and atmospheric data

Geographic analysis of the impacts of mountain pine beetle infestation on forest fire ignition

Assessing conservation regionalization schemes: employing a beta diversity metric to test the environmental surrogacy approach

Oil and gas infrastructure and the spatial pattern of grizzly bear habitat selection in Alberta, Canada

Assessing Quality of Spatial Models Using the Structural Similarity Index and Posterior Predictive Checks

A GIS-based risk rating of forest insect outbreaks using aerial overview surveys and the local Moran's I statistic

Measuring Dynamic Interaction in Movement Data

Ecosystem classifications based on summer and winter conditions

Quantifying spatial–temporal patterns in wildlife ranges using STAMP: A grizzly bear example

Modelling the ecosystem indicators of British Columbia using Earth observation data and terrain indices

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