GEOG 566






         Advanced spatial statistics and GIScience

Archive for April, 2018

April 30, 2018

Path Analysis for Understanding Visitor Movement

Filed under: 2018,Exercise/Tutorial 1 2018 @ 11:45 am

Question Asked The movement ecology paradigm provides a useful, organizing framework for understanding and conducting path analysis on GPS tracks of overnight, wilderness sea kayakers in Glacier Bay National Park and Preserve Wilderness. Formally proposed in 2008, the movement ecology paradigm was designed to provide an overarching framework to guide research related to the study […]

Advanced Spatial Statistics: Blog Post 1 (.5) : Temporal autocorrelation of phenological metrics

Filed under: 2018,Exercise/Tutorial 1 2018 @ 11:11 am

1. Key Question How has the phenology of production changed over time at two grassland sites, and does this change differ between and C3 and a C4 grassland? 2. Approach used My approach uses an autocorrelational analysis to assess whether differences in phenological indices are indicative of change over time, or cyclical patterns. 3. Methods […]

April 29, 2018

Mapping Beaver Dam Habitat and Geometry through OD Cost Analysis

Filed under: Exercise/Tutorial 1 2018 @ 6:08 pm

Questions: Question 1: How well do habitat models predict suitable beaver dam locations? This analysis was initially driven by the question of how well models of suitable habitat for beaver dams could predict stream reaches where observed beaver dam locations were identified during a pilot field season in the West Fork Cow Creek of the […]

April 27, 2018

Fitting and Assessing Fit of Lognormal Regression to Phenology Data

Filed under: 2018,Exercise/Tutorial 1 2018 @ 6:30 pm

QUESTION The purpose of this analysis was to find ways to describe phenological data I gathered in 2017, in order to quantify trends and compare between sites. Phenology was recorded for two interacting species: the introduced cinnabar moth (Tyria jacobaeae), and native perennial herb Senecio triangularis, which is a novel host to the moth larvae […]

April 26, 2018

Using multivariate statistics to test spatial variability of model performance.

Filed under: Exercise/Tutorial 1 2018 @ 2:42 pm

Question that you asked Understanding where my model performs well compared to in-situ observations is important for assessing the appropriateness of snow and climate metrics derived from it in comparison to Dall sheep demographic data. For instance, is the model adequately capturing the paths of wind-blown snow that are so critical for winter grazing? Are […]

April 25, 2018

Using a hidden Markov Model tool to identify movement patterns of recreationists

Filed under: 2018,Exercise/Tutorial 1 2018 @ 2:48 pm

Question that you asked For this exercise, the question that I asked was how to use path segmentation analysis to identify movement patterns of day-user recreationists at String and Leigh Lake in Grand Tetons National Park. Name of the tool or approach that you used. To answer this question, Susie and I employed methods derived […]

April 24, 2018

Spatial distribution of behavior changes

Filed under: Exercise/Tutorial 1 2018 @ 9:00 pm

Question: Since writing ‘My Spatial Problem’, a behavioral change point analysis tool was implemented on the swim paths of juvenile salmon as they encountered boom angles of 20, 30, and 40 degrees. Boiling entire swim paths down to one behavioral change point greatly simplifies the analysis, by investigating the hydraulic thresholds that may or may […]

Among-site differences in giant kelp (Macrocystis pyrifera) temporal autocorrelation

Filed under: 2018,Exercise/Tutorial 1 2018 @ 5:15 pm

Questions As a preliminary analysis to explore pattern before incorporating other variables, I investigated how giant kelp (Macrocystis pyrifera) autocorrelation varied through time. By way of refresh, these abundance data are from seven subtidal sites, with each site comprised of five 10x2m2 transects. All 35 transects were sampled biannually (every 6 months) since 1980. Based […]

April 22, 2018

Mapping fire extent from binary point data

Filed under: Exercise/Tutorial 1 2018 @ 11:25 am

(Please click the links to view all figures.  They aren’t very clear or large in the post!) Question that you asked? My overall objective is to build a predictive model of the annual spatial distribution of fire across my fire reconstruction area.  This will inform how fire extent and distribution were related to climate, topography, […]

April 20, 2018

Temporal Cross Correlation Between Bull Kelp Patches in Oregon

Filed under: 2018,Exercise/Tutorial 1 2018 @ 7:32 am

One of the ultimate questions of my work is comparing what factors drive bull kelp populations in northern California versus in Oregon. With this exercise I wanted to examine whether patches exhibited temporal synchrony from year to year. If they are in sync, this may suggest that the two populations are being driven by large-scale, […]

April 18, 2018

Visualizing a recreationists movement through space and time

Filed under: 2018,Exercise/Tutorial 1 2018 @ 1:30 pm

Question that you asked The question I asked for this exercise was how to plot and visually represent recreationists’ movements through time and space.  My goal was to plot five individual GPS tracks onto a graph with X & Y coordinates (Long & Lat), and a Z-coordinate representing time. To visualize and identify patterns within […]

April 13, 2018

Autocorrelation of GPP and LUE at C3 vs C4 grassland sites

Filed under: 2018,Exercise/Tutorial 1 2018 @ 12:36 pm

Question Asked: The question I asked in this exercise was: What degree and timing of temporal autocorrelation exists for LUE and GPP derived from eddy covariance flux data, and how does the degree and timing differ between a C3 and a C4 grassland site? I aim to use an autocorrelational analysis to assess temporal patterns […]

April 9, 2018

Predicting Produce Safety Rule compliance through spatiotemporal analysis of publicly-available water quality data

Filed under: 2018,My Spatial Problem @ 11:05 am
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Research Question Because of the numerous foodborne illness outbreaks associated with fresh produce, the Food and Drug Administration finalized the Produce Safety Rule in November 2015. This rule implements a variety of new food safety practices on the farm to prevent foodborne pathogens from reaching the consumer. As part of this new rule, growers of […]

April 8, 2018

Spatial and temporal variation in the historical fire regime of the Oregon pumice ecoregion

A description of the research question that you are exploring. I’m researching historical fire regimes in ponderosa pine, lodgepole pine, and mixed-conifer forests in south central Oregon. Previous fire history reconstructions demonstrate fires were historically frequent occurring every 10-20 years, and were predominantly low severity.  However, the size and sampling design of earlier reconstructions does […]

April 6, 2018

It’s all in the timing: Assessing risk of an introduced insect on a native plant through investigations of phenological synchrony

Filed under: 2018,My Spatial Problem @ 10:39 pm

1. Research Question / Background: Biological control of weeds involves introducing or augmenting natural enemies, such as insect herbivores, for population control of a target weed. Choosing insect herbivores that are highly specific to their host plants gives managers some confidence that these species will be safe & effective as biocontrol agents. However, our ability […]

Associations between physical substrate complexity and spatiotemporal kelp forest dynamics

Filed under: 2018,My Spatial Problem @ 10:08 pm

BACKGROUND Nearshore temperate kelp forests are structured by an interaction of physical forces and biological processes that produce patchy species assemblages across space and rapid shifts in community structure through time. At short temporal scales seasonal storm surge removes adult giant kelp (Macrocystis pyrifera) and can instigate community shifts, while longer-term periodicity (e.g., El Niño […]

What landscape factors are most important to predicting beaver dam occurrence in the Oregon Coast Range?

Filed under: 2018,My Spatial Problem @ 5:51 pm

Project Overview: North American beavers (Castor canadensis) are often referred to as ‘ecosystem engineers’ because they can fundamentally transform stream and riparian ecosystems through dam building, pond creation, and intensive foraging on vegetation. Recent literature suggests that beaver restoration via, introduction of beavers to unoccupied stream reaches, may provide for a cost-effective strategy to restore […]

How does photosynthetic pathway of a grassland affect seasonality and drought response of productivity?

Filed under: 2018,My Spatial Problem @ 3:24 pm

      A description of the research question that you are exploring. Grasslands are key social, economic, ecological components of US landscapes, and globally, ecosystems containing abundant grassy cover are estimated to compose ~30 percent of non-glacial land cover (Still et al., 2003; Asner et al., 2004). Yet, compared to forests, we know relatively little […]

The wrong snow for sheep…

Filed under: 2018,My Spatial Problem @ 3:20 pm

Research question. Dall Sheep are a species of wild sheep whose ranges extend throughout mountainous Alaska and the Yukon Territory. As a large ungulate specialised in grazing sub-Arctic to Arctic alpine regions, they are important maintainers of ecosystem function in habitats considered particularly sensitive to environmental change. They also provide an important service to local, […]

Spatial and Temporal Patterns Among Multi-day, Overnight Wilderness Users

Filed under: My Spatial Problem @ 10:48 am

A description of the research question that you are exploring. Glacier Bay National Park and Preserve (GLBA), located in southeast Alaska, contains over 2.7 million acres of federally designated terrestrial and marine wilderness (National Park Service, 2015). Recreation users access GLBA Wilderness primarily by watercraft; the park lacks formal trail networks in its wilderness and […]

April 5, 2018

Exploring spatial and temporal behavior patterns of recreationists in Grand Teton National Park

Filed under: My Spatial Problem @ 12:33 pm

Overall context about my research and spatial problem: For my Master’s thesis I will be exploring the spatial and temporal behavior patterns of water-based recreationists at a popular lake destination in Grand Teton National Park. More specifically, I will be examining if there are differences in the movements between three primary paddlesport user groups: canoers, […]

Understanding trends in and environmental drivers of bull kelp abundance

Filed under: My Spatial Problem @ 10:30 am

Research Question: Along the pacific coast of North America, Nereocystis luetkeana is the dominant canopy forming kelp from central California up to Alaska (Springer et al., 2006). This annual seaweed is subject to extensive swings in population size (up to two orders of magnitude) from year to year. This study aims to identify potential environmental […]

April 4, 2018

The Hydraulic and Behavioral Impacts of a Floating Guidance Structure

Filed under: My Spatial Problem @ 1:36 pm

Research question: Floating guidance structures (also called floating booms or guide walls) are long, partially-submerged panels that alter channel hydraulics to promote safe passage through man-made barriers (Schilt 2007). Their use and implementation is widespread, from the mouths of floating surface collectors to diversion channels and dam forebays (Scott 2014; Reeves et al 2016; Johnson […]

Class test #2

Filed under: My Spatial Problem @ 12:09 pm

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April 2, 2018

Final Project Sample

Filed under: Final Project @ 2:40 pm

Tutorial 2 sample

Filed under: 2017 @ 2:39 pm

Tutorial 1 Sample

Filed under: Exercise/Tutorial 1 2018 @ 2:36 pm

My spatial problem test

Filed under: My Spatial Problem @ 1:34 pm

test test

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