GEOG 566






         Advanced spatial statistics and GIScience

Archive for May, 2018

May 30, 2018

Trends in 2017 Phenology Study Soil Temperature and Moisture Data

Filed under: 2018,Exercise/Tutorial 2 2018 @ 9:58 am

QUESTION: For this exercise, I looked into environmental variables that I had measured in conjunction with plant and insect phenology data during the 2017 growing season. In 2017, explanatory variables that I tracked included: soil temperature & soil moisture at a depth of 8cm, measured per individual plant during each survey; ambient temperature at 30cm […]

Exploring the Distribution of Stream Habitat Characteristics and Observed Beaver Dam Locations in the West Fork Cow Creek Watershed

Filed under: 2018,Exercise/Tutorial 2 2018 @ 9:56 am

Question that I asked: How do stream reaches with observed beaver dams sites in West Fork Cow Creek relate to stream gradient, active channel width and valley bottom width? In this exercise I developed a few charts to consider the distribution of the stream habitat in terms of stream gradient, active channel width and valley […]

May 29, 2018

Exploring relationships among environmental variables and time for hikers in Grand Teton National Park

Filed under: 2018,Exercise/Tutorial 2 2018 @ 9:56 am

Question that you asked: Brief context: Throughout this class we have been exploring how human behavior and movement is influenced by environmental factors: are there underlying features in the surrounding environment that relate to the patterns of a recreationists’ movement? For example, are there environmental conditions that tend to result in shorter step lengths and […]

May 23, 2018

Examining time-series of downscaled alpine air temperature and snowfall across different climate classes in Alaska in comparison to major climate indices.

Filed under: 2017,Exercise/Tutorial 2 2018 @ 11:52 am

Question asked Do large scale patterns of climate, e.g. the Pacific Decadal Oscillation, explain long-term variability in alpine snowfall and air temperature in Alaska? Is their effect spatially variable across the state?   Data / Tool / Approach used To answer this question, I used monthly and seasonally aggregated data from daily model output for […]

May 21, 2018

Exploring landcover class and elevation as potential explanatory variables for movement

Filed under: Exercise/Tutorial 2 2018 @ 9:30 pm

Question Asked For Exercise 2, I sought to explore the potential relationship between two independent, terrestrial variables of the Glacier Bay National Park and Preserve Wilderness landscape that may have explanatory power for the dependent variables of step length and turning angle generated through use of the moveHMM tool in Exercise 1. Of the publicly […]

How does cross-correlation of GPP and LUE with soil water content differ among years and photosynthetic functional types?

Filed under: 2018,Exercise/Tutorial 2 2018 @ 11:57 am

1. Question asked: How is soil water content related to gross primary production (GPP) and the light use efficiency of photosynthesis (LUE) of a natural grassland? How do these relationships differ between C3- and C4-dominated grasslands? 2. Tool / approach used: To answer this question, I calculated cross-correlation of GPP and LUE with soil water […]

May 20, 2018

Subtidal bathymetry slope characteristics at increasing spatial scales around long-term monitoring sites

Filed under: 2018,Exercise/Tutorial 2 2018 @ 11:13 am

Question  I derived statistics from nearshore subtidal bathymetry (my hypothesized explanatory variable), including slope angle: (1) minimum, (2) maximum, (3) mean, and (4) standard deviation. These four statistics were calculated at increasing spatial scales around the long-term subtidal monitoring sites at San Nicolas Island, using buffers around the 10x2m2 transects at: 2m, 5m, 10m, 25m, […]

May 15, 2018

Determining Fire-Climate Relationships with Superposed Epoch Analysis

Filed under: Exercise/Tutorial 2 2018 @ 12:14 pm

Background My overall goal is to build a model that predicts the probability of fire at a point in each year from 1700-1918 based on climate, fuel (time since fire), local environment (annual temperature and precipitation, elevation, forest type, etc), and surrounding environment. Prior to constructing this model I need to understand how annual climate […]

May 10, 2018

Relationship between satellite derived and nearshore ocean temperatures

Filed under: Exercise/Tutorial 2 2018 @ 1:41 pm

My goal for this tutorial was to look at the relationship between satellite-derived sea surface temperatures (SST) and measured intertidal temperature. I want to use temperature as one of my potential explanatory variables for kelp population size, but neither of these data sets match my temporal and spatial scales. The satellite SST goes back until […]

Multivariate analysis of the location of behavior changes

Filed under: Exercise/Tutorial 2 2018 @ 1:25 pm

Question: Because the spatial distribution of behavior changes doesn’t change with boom angle, the results of Exercise 1 imply that hydraulic conditions do not drive fish behavior in this experiment (Figure 1). However, because analogous research and common sense implies that thresholds of hydraulics indeed affect fish behavior, a statistical analysis is necessary to determine […]

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