GEOG 566






         Advanced spatial statistics and GIScience

Archive for April, 2019

April 28, 2019

Determining suitable habitat for Olympia oysters in Yaquina Bay, OR

Exercise #1 Question that you asked: My goal for my thesis work is to evaluate the distribution of native Olympia oysters in Yaquina Bay, Oregon by assessing habitat suitability through spatial analysis of three habitat parameters: salinity, substrate availability, and elevation. A map of predicted suitable habitat as a result of the spatial analysis will […]

April 26, 2019

Spatial Pattern of NDVI change from the Center of an Artisanal Gold Mine

Filed under: Exercise 2 @ 5:22 pm

For Exercise 2, I wanted to explore how the spatial distribution of land use/land cover (LULC) varied in relation to an artisanal, small-scale gold mine (ASGM). To do this, I took the NDVI change maps which I had generated for Exercise 1 (modified slightly to produce better, more accurate results), as well as my dataset […]

What is the spatial pattern of the ground cover vegetation within 100 m, 500 m and 1 km of 20 wetland sites?

Filed under: 2019,Exercise 1 @ 11:58 am

Exercise 1: What is the spatial pattern of the ground cover vegetation within 100 m, 500 m and 1 km of 20 wetland sites? To determine these spatial patterns I first imported the latitudinal and longitudinal locations of my wetland sites as a point layer by adding a csv file with this data from the […]

Ripley’s K analysis on two forested stands

Bryan Begay Question asked Can a point pattern analysis help describe the relationship between the spatial pattern of trees in my area of interest with forest aesthetics? More specifically, how does Ripley’s K function describe forest aesthetics in different parts of the forest on the McDonald-Dunn Forest. Tool The main tool that I used for […]

April 25, 2019

Recession Analysis in Two Coastal Basins

Filed under: 2019,Exercise 1 @ 3:21 pm

Research Question The question that I asked for this exercise was: What is the spatial variability of the recession timescale at different flow rates in rain-dominated, coastal basins? Approach Stream flow regimes are generally defined by five components: magnitude, frequency, duration, timing, and rate of change (Poff et al., 1997). For the purposes of this […]

April 20, 2019

Leaf spot patch analysis caused by Blackleg

Filed under: 2019,Exercise 1 @ 4:55 pm

Review My research involves the classification of a leaf spots on turnip derived from the pathogen blackleg. I had hypothesized that spatial patterns of pixels based on image classification are related to manually classified spatial patterns of observed disease on turnip leaves because disease has a characteristic spectral signature of infection on the leaves. This […]

April 19, 2019

Spatial Patterns of Salmonella Rates in Oregon

Question Asked At this stage I asked several questions regarding the spatial distribution of population characteristics in all counties in Oregon in 2014: What are the county level spatial patterns of reported age-adjusted Salmonella rates within Oregon in 2014? County level spatial patterns of proportions of females? Median Age? Proportion of infants/young children aged 0-4 […]

Exercise 1: Preparing for Point Pattern Analysis

Exercise 1 The Question in Context In order to answer my question: are the dolphin sighting data points clustered along the transect surveys or do they have an equal distribution pattern? I need to use point pattern analysis. I am trying visualize where in space dolphins were sighted along the coast of California, specifically from […]

Point Pattern Analysis of Tree Distribution by Height in the HJ Andrews Forest

1. Given that HJ Andrew Experimental Forest is a 16,000-acre forest with manipulations spanning back to its establishment as a Long-Term Ecological Research (LTER) site in 1948, it is a highly spatially heterogeneous ecosystem. Forest harvest began in the 1950s and resulted in a mosaic of young plantation forest (~30 percent of total forest area) […]

Exercise 1: Principal component analysis for rural index weighting & rural indicator measure contributions for Texas counties

Filed under: 2019,Exercise 1 @ 3:08 pm
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Questions Being Asked: How much do different indicator measures of rurality in Texas counties each contribute to a basic index of rurality both statistically and spatially? How much does the weighted basic index differ from a simple calculated mean for rurality? Tools and Approaches Used The major statistical method I used to answer these questions […]

Mapping the stain: Using spatial autocorrelation to look at clustering of infection probabilities for black stain root disease

My questions: I am using a simulation model to analyze spatial patterns of black stain root disease of Douglas-fir at the individual tree, stand, and landscape scales. For exercise 1, I focused on the spatial pattern of probability of infection, asking: What is the spatial pattern of probability of infection for black stain root disease […]

Grant Z’s Exercise 1: Determining Moran’s I of LULC/NDVI change in rural Senegal

Filed under: 2017 @ 1:54 pm

For this first exercise, I wanted to determine how land use/land cover (LULC) was spatially auto-correlated with itself in my region of interest. In order to do this, I acquired two Landsat images, one from the past and one from present, conducted an NDVI (normalized difference vegetation index) analysis on each, determined the difference between […]

Exercise 1: Comparison of Interpolation Methods Using Fisheries Abundance Data

Filed under: 2019,Exercise 1 @ 1:07 pm

Question Asked I would like to understand how the spatial variability of forage fish in the California Current Ecosystem is related to the spatial pattern of seascape classes (based on remotely sensed sea-surface variables)? In exercise 1, I will asking “what is the spatial pattern of forage fish in the California Current ecosystem?” In order […]

Determining spatial autocorrelation of refugee settlements in Uganda

Filed under: 2019,Exercise 1 @ 12:40 pm

Question that you asked In analyzing the distribution of settlement boundaries that I obtained from OpenStreetMap, I wanted to know the general clustering and regionality of settlements in order to understand how other spatial statistics that I perform in my next step will behave based on the results from this explanatory step. The question I’m […]

Ex. 1: Spatial Autocorrelation in Stream Cross-Sectional Change In the Andrews Forest

Filed under: 2019,Exercise 1 @ 12:00 pm
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Question that you asked How much spatial autocorrelation exists in historic streambed changes in the Andrews Forest, both in the across-stream direction and the along-stream direction? Name of the tool or approach that you used I addressed each direction of the problems separately using. Since this resulted in one-dimensional, evenly spaced or faux-evenly spaced data, […]

Exercise 1: Spatial Distribution of Juniper Saplings

Filed under: 2019,Exercise 1 @ 11:52 am

1.Question asked and data used:  What are the spatial patterns of juniper sapling establishment within a treated watershed 14 years after most juniper were removed? Two data sets were used for this analysis: Thirty-three belt transects (30 m in length, 3 m in width) were used to assess the density of juniper saplings within the […]

April 18, 2019

Spatial variation of economic losses resulting from a joint earthquake/tsunami event: An application to Seaside, OR

Question What is the spatial variability of economic value of buildings as well as losses resulting from a joint earthquake/tsunami event? How does this spatial variability relate to independent earthquake and tsunami events, as well as the intensity of the hazard? The purpose of this analysis was to consider the spatial variability of initial economic […]

April 17, 2019

Courtney’s Ex 1: Spatial patterns of ion concentrations in groundwater

1: Question being asked How do ion and isotope concentrations vary spatially? And what trends in concentrations account for variability between my samples? For detailed background information, I point you towards my problem statement for this class. In short, I’m hoping to use geochemical and isotope values for wells 32 well I sampled last summer […]

Exercise 1: Ventenata spatial clustering

Filed under: 2019,Exercise 1 @ 1:56 pm
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Question Asked I am interested in understanding the invasion potential of the recently introduced annual grass ventenata (Ventenata dubia) across eastern Oregon. Here I ask, what is the spatial pattern of the ventenata invasion across the Blue Mountains Ecoregion of eastern Oregon? Tools and Approaches Used To address this question, I (1) tested for spatial […]

Exercise 1: What is the spatial pattern of western hemlock dwarf mistletoe at the Wolf Rock reference stand?

For Exercise 1, I wanted to analyze the spatial pattern of western hemlock dwarf mistletoe infections in live western hemlocks on my 2.2 ha reference stand (Wolf Rock). This was without considering any attributes of the western hemlock trees themselves. Simply, what was the spatial pattern of infection? To answer this I used the “Average […]

Exercise 1: The Variogram

Question: How does the variance between the depths to the first lava flow in my filed area vary with increasing distance? The Tool: Variogram I used a variogram to analyze the variance within my dataset. Variograms are discrete functions calculated using to measure the average correlation between pairs of measurements at various distance (Cameron and […]

April 12, 2019

Exercise 1: The Spatial Patterns of Natural Resource Governance Perceptions

Question What are the spatial patterns of natural resource governance perceptions in the Puget Sound? Tools and Approaches Moran’s I (with correlograms) and Semivariograms in R studio Kriging and IDW in ArcGIS Pro Hotspot Analysis in ArcGIS Pro   Analysis Steps To compute Moran’s I, I used the “ape” library in R which has a […]

April 6, 2019

Monitoring Stage 0 Restoration Effects on the South Fork McKenzie River

Filed under: 2019,My Spatial Problem @ 3:35 pm

Research Question How is the spatial presence of aquatic organisms in the lower South Fork McKenzie River related to the spatial presence of hydromorphological changes induced by Stage 0 stream restoration? Global hydrologic systems historically contained anastomosing (braided and connected) channels and active floodplains. Anthropogenic disturbances of the late 19th and early 20th centuries and […]

April 5, 2019

The Biogeography of Coastal Bottlenose Dolphins off of California, USA between 1981-2016

Background/Description: Common bottlenose dolphins (Tursiops truncatus), hereafter referred to as bottlenose dolphins, are long-lived, marine mammals that inhabit the coastal and offshore waters of the California Current Ecosystem. Because of their geographical diversity, bottlenose dolphins are divided into many different species and subspecies (Hoelzel, Potter, and Best 1998). Bottlenose dolphins exist in two distinct ecotypes […]

My Spatial Problem: Streamflow variability and associated processes in rain-dominated, coastal basins

Filed under: 2019,My Spatial Problem @ 10:37 pm

My research explores the variability in streamflow patterns in rain-dominated systems of the Pacific Northwest. Rain-dominated climate regimes occur primarily in the coastal portion of the PNW. Because precipitation only occurs as rain and does not occur in significant quantities during the summer season, underground storage is a crucial component of both the water cycle […]

A stain on the record? Have forest management practices set up PNW landscapes for a black-stain-filled future?

Describe the research question that you are exploring. I am looking at how forest management practices influence the spread of black stain root disease (BSRD), a fungal root disease that affects Douglas-fir in the Pacific Northwest. While older trees become infected, BSRD primarily causes mortality in younger trees (< 30-35 years old). Management practices (e.g., […]

The Geography of Exclusion

Description of the research question: My research focuses on vulnerable populations, specifically refugees and internally displaced peoples. This is a small part of a larger project funded by NASA, “Mapping the Missing Millions” and is largely defined as the “geography of exclusion.” I am hoping to understand why settlements have been excluded from global population […]

A UAS and LiDAR based approach to maximizing forest aesthetics in a timber harvest

Bryan Begay Research Question:  Can LiDAR derived from an Unmanned Aerial System (UAS) create a point cloud driven visualization model for maximizing forest aesthetics in a highly visible timber harvest? Context A variable retention thinning is planned to be implemented in a harvest unit on the McDonald-Dunn Forest in a visible area near Corvallis. UAS […]

How winter wetland habitat change over time affects songbird communities

A description of the research question that you are exploring. For my research, I am exploring the relationship between the spatial pattern of the differences between present (2019) and past (1995) wintering songbird community composition metrics (abundance, richness, evenness, and weighted rarity) and the spatial pattern of landscape-level land cover variable changes (listed here: Landscape Variables) […]

Assessing western juniper sapling re-establishment in a semiarid watershed

Filed under: 2019,My Spatial Problem @ 2:32 pm

1. My spatial problem A description of the research question that you are exploring. Research question: How is the spatial pattern of juniper density (A) related to the spatial pattern of slope, aspect, and a combination of the two (B) via soil moisture and solar radiation? The expansion of western juniper has become a concern […]

Cross-sectional Change in the Andrews Forest

Background and Research Questions This project explores stream bed mobility in the HJ Andrews experimental forest in relationship to peak discharge events and channel geometry. The HJ Andrews Experimental Forest is a Long Term Ecological Research (LTER) Site located east of Eugene on the western slope of the Cascade Range. The site has been managed […]

Aerial remote sensing detection of Leptosphaeria spp. on Turnip

Filed under: 2019,My Spatial Problem @ 2:17 pm

Introduction Of the many pathogens disrupting healthy growth of brassica species in the valley is the pathogen commonly referred to as Blackleg. This fungal pathogen has been reported to nearly wipe out canola production in Europe, Australia, Canada and in more recent years has devastated the United States (West et al., 2001). In 2013 the […]

Courtney’s Spatial Problem

In the formula “How is the spatial pattern of A related to the spatial pattern of B via mechanism C?”, my research question for this class is made of the following parts: A: ion and isotope concentrations in wells tapping the basalt aquifer B: mapped faults C: groundwater flow as determined by hydraulic conductivity of […]

Individual foraging specialisations of gray whales along the Oregon coast through prey preferences

Filed under: 2019,My Spatial Problem @ 2:02 pm

Research Question The Pacific Coast Feeding Group (PCFG) is a subgroup of the Eastern North Pacific (ENP) population of gray whales (Scordino et al.2018). The ENP, a population of 24,000-26,000 individuals, migrates along the U.S. west coast from breeding grounds in the lagoons of Baja California, Mexico to feeding grounds in the Bering Sea (Omura […]

Grant Z’s Spatial Problem

Filed under: 2019,My Spatial Problem @ 1:58 pm

My spatial problem is about land use/land cover (LULC) change associated with the establishment of artisanal, small-scale gold mines (ASGM) in rural Senegal. Put in the vernacular we’ve learned in the course, I’d phrase my question this way: How is the spatial pattern of LULC change related to the spatial pattern of ASGM establishment via […]

Spatial pattern of invasion

Filed under: 2019,My Spatial Problem @ 1:52 pm

 A description of the research question that you are exploring. I am interested in how the spatial pattern of invasion by the recently introduced annual grass, ventenata, is influenced by the spatial pattern of suitable habitat patches (scablands) via the susceptibility of these habitat patches to invasion and ventenata’s invasion potential.  Habitat invisibility is determined […]

Using Spatial Statistics to Determine the Subsurface Spatial Distribution of Lava Flows in Northern California

Filed under: 2019,My Spatial Problem @ 1:51 pm

Research Question I am trying to determine potential fluid flow paths based on the spatial distribution of lava flows in the Medicine Lake, Lassen Peak Big Valley Mountain area of Northern California. The final goal of this project is a 3-D subsurface framework of the geology from which we can model fluid and heat flow. […]

Epidemiology of Western Hemlock Dwarf Mistletoe Post – Mixed Severity Fire

Description of the Research Question My study site is located in the HJ Andrews Experimental Forest, where the two most recent mixed severity fires burned leaving a sizable fire refugia in the middle of the stand. Western hemlock dwarf mistletoe (WHDM) survived the fire in this refugia. WHDM spreads via explosively discharged seed and rarely […]

Predicting spatial distribution of Olympia oysters in the Yaquina estuary, OR

My spatial problem A description of the research question that you are exploring. My research aims to determine the current abundance and spatial distribution of native Olympia oysters in Yaquina Bay, Oregon. This oyster species has experienced massive decline in population due to overharvest during European settlement of the western United States. Yet its value […]

My Spatial Problem – Elevated Blood Lead Levels in Bangladeshi Children: What is to blame?

Background: No level of lead exposure is considered safe, and humans have experienced its toxicity to nearly every organ system, especially the central nervous system (1,2).  Exposures to lead, especially for the developing neurological system of children, are known to be hazardous and greatly impact children (2). Environmental contamination is a widespread public health issue […]

Deaggregation of infrastructure damages and functionality based on a joint earthquake/tsunami event: an application to Seaside, Oregon.

Research Question and Background The Pacific Northwest is subject to a rupture of the Cascadia Subduction Zone (CSZ) which will consequently result in both an earthquake and tsunami. While all communities along the coast are vulnerable to the earthquake hazard (e.g. ground shaking), low lying communities are particularly vulnerable to both the earthquake as well […]

Examining the Spatial Relationships between Seascapes and Forage Fishes

Description of Research Question My objective is to study the spatial relationships between sea-surface conditions and assemblages of forage fish in the California Current System from 1998 to 2015. Forage fish are a class of fishes that are of importance to humans and resource managers, as they serve as the main diet for economically and […]

Seth Rothbard My Spatial Problem

Filed under: My Spatial Problem @ 1:37 pm
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A description of the research question that you are exploring Of the 31 pathogens known to cause foodborne illness, Salmonella is estimated to contribute to the second highest number of illnesses, the most hospitalizations, and the highest number of deaths in the US when compared to other domestically acquired foodborne illnesses1. Salmonellosis is the bacterial […]

Natural Resource Governance Perceptions and Environmental Restoration

Research Question How is the spatial pattern of individuals perception of natural resource governance related to the spatial pattern of environmental restoration sites via distance and abundance of improved sites?    My Datasets Puget Sound Partnership Environmental Outputs Data The Puget Sound Partnership—a governmental monitoring entity—keeps records of environmental restoration projects throughout the Sound. There […]

Exploring spatial variation in drivers of soil CO2 efflux in HJ Andrews Forest

Description of Research Question My objective is to capture modes of variance that exist between and within a subset of variables that I expect to correlate most strongly with soil CO2 efflux in the HJ Andrews (HJA) forest. By stratifying the forest, I plan to determine future sampling sites that will be used to explore […]

April 4, 2019

What is rural? Creation and comparison of health disparity-inclined rural indices in Texas

Filed under: My Spatial Problem @ 3:00 pm

A description of the research question that you are exploring. I am exploring rural classification of counties in the state of Texas by creating two rural indices and comparing them to one another to determine the effects of specific weighted measures on rurality index score. One of the indices will contain basic rural indicator variables, […]

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