Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Anthropology (195)
- Remote Sensing (28)
- Physical Sciences and Mathematics (20)
- Forest Sciences (13)
- Life Sciences (13)
-
- Geographic Information Sciences (12)
- Architecture (11)
- Human Geography (11)
- Spatial Science (10)
- Arts and Humanities (9)
- Urban, Community and Regional Planning (9)
- Computer Sciences (7)
- History (7)
- Archaeological Anthropology (6)
- Education (6)
- Engineering (6)
- Environmental Sciences (6)
- Higher Education (6)
- Landscape Architecture (6)
- Oceanography and Atmospheric Sciences and Meteorology (6)
- Educational Methods (5)
- Electrical and Computer Engineering (5)
- Physical and Environmental Geography (5)
- Atmospheric Sciences (4)
- Earth Sciences (4)
- Signal Processing (4)
- Urban Studies and Planning (4)
- Environmental Studies (3)
- Institution
- Keyword
-
- Remote sensing (22)
- GIS (14)
- Deep learning (9)
- Climate change (8)
- Geography (8)
-
- Twitter (8)
- Environmental Sciences (7)
- LiDAR (7)
- Limnology (7)
- Water Resources (7)
- Spatial science (6)
- Archaeology (5)
- Classification (5)
- Coastal (5)
- Machine learning (5)
- Remote Sensing (5)
- Tropical cyclones (5)
- Big data (4)
- CNN (4)
- COVID-19 (4)
- Flood (4)
- Gulf of Mexico (4)
- Latin America (4)
- Malaria (4)
- Pelvis (4)
- Peru (4)
- SUAS (4)
- Underwater archaeology (4)
- Variability (4)
- Vegetation index (4)
- Publication Year
Articles 271 - 300 of 376
Full-Text Articles in Geography
Integrating Hands-On Undergraduate Research In An Applied Spatial Science Senior Level Capstone Course, David Kulhavy, Daniel R. Unger, I-Kuai Hung, David Douglass
Integrating Hands-On Undergraduate Research In An Applied Spatial Science Senior Level Capstone Course, David Kulhavy, Daniel R. Unger, I-Kuai Hung, David Douglass
Faculty Publications
A senior within a spatial science Ecological Planning capstone course designed an undergraduate research project to increase his spatial science expertise and to assess the hands-on instruction methodology employed within the Bachelor of Science in Spatial Science program at Stephen F Austin State University. The height of 30 building features estimated remotely with LiDAR data, within the Pictometry remotely sensed web-based interface, and in situ with a laser rangefinder were compared to actual building feature height measurements. A comparison of estimated height with actual height indicated that all three estimation techniques tested were unbiased estimators of height. An ANOVA, conducted …
African Cowboys On The Argentine Pampas: Their Disappearance From The Historical Record, Andrew Sluyter
African Cowboys On The Argentine Pampas: Their Disappearance From The Historical Record, Andrew Sluyter
Faculty Publications
No abstract provided.
Dreaming Of Dry Land: Environmental Transformation In Colonial Mexico City, Andrew Sluyter
Dreaming Of Dry Land: Environmental Transformation In Colonial Mexico City, Andrew Sluyter
Faculty Publications
No abstract provided.
Trends And Spatial Variability In Dry Spells Across The South-Central United States, Jill C. Trepanier, Michael J. Roberts, Barry D. Keim
Trends And Spatial Variability In Dry Spells Across The South-Central United States, Jill C. Trepanier, Michael J. Roberts, Barry D. Keim
Faculty Publications
Annual average and maximum spells with no precipitation in the southern United States are analyzed. In this study, dry spells are defined as consecutive days with no measurable rainfall. The study area includes 70 weather stations in Texas, Oklahoma, Louisiana, Arkansas, Mississippi, and Tennessee. Interarrival times between daily precipitation records for each station provide the data for this analysis. All 70 stations were analyzed from 1950 to 2013. Six stations that each have data for more than 100 years were analyzed for the period from 1908 to 2013. Approximately 25% of stations in the region show significant negative trends through …
Potential Of X-Band Images From High-Resolution Satellite Sar Sensors To Assess Growth And Yield In Paddy Rice, Yoshio Inoue, Eiji Sakaiya, Cuizhen Wang
Potential Of X-Band Images From High-Resolution Satellite Sar Sensors To Assess Growth And Yield In Paddy Rice, Yoshio Inoue, Eiji Sakaiya, Cuizhen Wang
Faculty Publications
The comprehensive relationship of backscattering coefficient (σ0) values from two current X-band SAR sensors (COSMO-SkyMed and TerraSAR-X) with canopy biophysical variables were investigated using the SAR images acquired at VV polarization and shallow incidence angles. The difference and consistency of the two sensors were also examined. The chrono-sequential change of σ0 in rice paddies during the transplanting season revealed that σ0 reached the value of nearby water surfaces a day before transplanting, and increased significantly just after transplanting event (3 dB). Despite a clear systematic shift (6.6 dB) between the two sensors, the differences in σ …
African Arrivals And Transformations, Andrew Sluyter
African Arrivals And Transformations, Andrew Sluyter
Faculty Publications
No abstract provided.
Painting A Map Of Sixteenth-Century Mexico City: Land, Writing, And Native Rule, Andrew Sluyter
Painting A Map Of Sixteenth-Century Mexico City: Land, Writing, And Native Rule, Andrew Sluyter
Faculty Publications
No abstract provided.
Producing Africa At The New Orleans Jazz & Heritage Festival, Helen A. Regis
Producing Africa At The New Orleans Jazz & Heritage Festival, Helen A. Regis
Faculty Publications
No abstract provided.
Evaluating Tree Height Using Pictometry® Hyperspatial Imagery, Daniel Unger, David Kulhavy, Matthew A. Wade
Evaluating Tree Height Using Pictometry® Hyperspatial Imagery, Daniel Unger, David Kulhavy, Matthew A. Wade
Faculty Publications
This study evaluated the use of Pictometry® hyperspatial 4-inch (10.2 centimeters) multispectral imagery to estimate height of baldcypress trees on the campus of Stephen F. Austin State University (SFASU), Nacogdoches, Texas. Actual tree heights of 60 baldcypress trees measured with a telescopic height pole were compared to Pictometry® estimated tree height. Linear correlation coefficients (r) and coefficient of determinations (R2) between actual tree height and Pictometry® estimated tree height for all 60 tress, and the shortest 30 and tallest 30 trees, were calculated. A paired t-test (alpha = 0.05) was calculated for all 60 tress, and the shortest 30 and …
New Mexico's Spanish Livestock Heritage: Four Centuries Of Animals, Land, And People., Andrew Sluyter
New Mexico's Spanish Livestock Heritage: Four Centuries Of Animals, Land, And People., Andrew Sluyter
Faculty Publications
No abstract provided.
History Of The Non-Spanish Antilles, Andrew Sluyter
History Of The Non-Spanish Antilles, Andrew Sluyter
Faculty Publications
No abstract provided.
An Ice-Core Pollen Record Showing Vegetation Response To Late-Glacial And Holocene Climate Changes At Nevado Sajama, Bolivia, C. A. Reese, K. B. Liu, L. G. Thompson
An Ice-Core Pollen Record Showing Vegetation Response To Late-Glacial And Holocene Climate Changes At Nevado Sajama, Bolivia, C. A. Reese, K. B. Liu, L. G. Thompson
Faculty Publications
We present the results of pollen analysis performed on an ice core recovered from Nevado Sajama, Bolivia, dated to 25 ka BP. Low pollen concentrations from 25 to 15 ka BP are consistent with the scenario of an expanded ice cap surrounded by sparse vegetation and cold conditions on the Altiplano during the Last Glacial Maximum. After 15 ka BP, more pollen is present and percentages show vegetation response to climate fluctuations during the late Pleistocene. Initially, high concentrations of Poaceae pollen are replaced by Asteraceae pollen, suggesting the occurrence of dry conditions towards the end of the Bolling-Allerod/Guantiva interstadial. …
Does Altitude Moderate The Impact Of Lithium On Suicide? A Spatial Analysis Of Austria, Marco Helbich, Victor Blüml, Michael Leitner, Nestor D. Kapusta
Does Altitude Moderate The Impact Of Lithium On Suicide? A Spatial Analysis Of Austria, Marco Helbich, Victor Blüml, Michael Leitner, Nestor D. Kapusta
Faculty Publications
Suicide, the tenth leading cause of death worldwide, is a complex phenomenon. Models aiming to explain the interaction of ambient variables such as socioeconomic factors, lithium content of drinking water and altitude are poorly developed. While controlling for several risk factors, this research bridges two different, but complementary research lines by investigating statistically the relationship on suicide mortality between lithium levels in drinking water in response to altitude above sea level. Besides regression models with main effects, a multiplicative interaction model between lithium and altitude has been developed providing estimates at the district-level for Austria where spatial autocorrelation was accounted …
Geospatial Examination Of Lithium In Drinking Water And Suicide Mortality, Marco Helbich, Michael Leitner, Nestor D. Kapusta
Geospatial Examination Of Lithium In Drinking Water And Suicide Mortality, Marco Helbich, Michael Leitner, Nestor D. Kapusta
Faculty Publications
Background: Lithium as a substance occurring naturally in food and drinking water may exert positive effects on mental health. In therapeutic doses, which are more than 100 times higher than natural daily intakes, lithium has been proven to be a mood-stabilizer and suicide preventive. This study examined whether natural lithium content in drinking water is regionally associated with lower suicide rates.Methods: Previous statistical approaches were challenged by global and local spatial regression models taking spatial autocorrelation as well as non-stationarity into account. A Geographically Weighted Regression model was applied with significant independent variables as indicated by a spatial autoregressive model.Results: …
Small Anatomical Variant Has Profound Implications For Evolution Of Human Birth And Brain Development, Robert G. Tague
Small Anatomical Variant Has Profound Implications For Evolution Of Human Birth And Brain Development, Robert G. Tague
Faculty Publications
No abstract provided.
Sub-Pixel Classification Of Forest Cover Types In East Texas, Joey Westbrook, I-Kuai Hung, Daniel Unger, Yanli Zhang
Sub-Pixel Classification Of Forest Cover Types In East Texas, Joey Westbrook, I-Kuai Hung, Daniel Unger, Yanli Zhang
Faculty Publications
Sub-pixel classification is the extraction of information about the proportion of individual materials of interest within a pixel. Landcover classification at the sub-pixel scale provides more discrimination than traditional per-pixel multispectral classifiers for pixels where the material of interest is mixed with other materials. It allows for the un-mixing of pixels to show the proportion of each material of interest. The materials of interest for this study are pine, hardwood, mixed forest and non-forest. The goal of this project was to perform a sub-pixel classification, which allows a pixel to have multiple labels, and compare the result to a traditional …
Identifying Well Pads In The Haynesville Shale Region, Louisiana And Texas, With Digital Imagery, Darinda Dans, Daniel Unger, Kenneth W. Farrish, I-Kuai Hung
Identifying Well Pads In The Haynesville Shale Region, Louisiana And Texas, With Digital Imagery, Darinda Dans, Daniel Unger, Kenneth W. Farrish, I-Kuai Hung
Faculty Publications
The Haynesville Shale is an underlying rock formation in northwest Louisiana and northeast Texas that contains vast quantities of natural gas. With new technology has come the ability to extract more natural gas from one of the largest gas deposits in the United States. With increased production, increased change in the local ecosystem will occur. It is necessary to examine oil and gas exploration effects on the local ecosystem due to changes in land cover, such as habitat loss and increased soil erosion. Remotely sensed imagery were utilized to ascertain the use of various digital image processing techniques to determine …
Late Wisconsinan Glacial Geomorphology Of The Kent Interlobate Complex, Ohio, U.S.A., João Santos
Late Wisconsinan Glacial Geomorphology Of The Kent Interlobate Complex, Ohio, U.S.A., João Santos
Faculty Publications
The northern sector of the Kent Interlobate Complex, created by two major ice lobes of the Laurentide Ice Sheet during late Wisconsinan times, dominates the glacial landscape of northeast Ohio. The geomorphology of this impressive complex reveals the presence of large hummocks, kettle lakes and substantial esker chains. The esker chains, usually smaller than 1.3 km long, run parallel to the interlobate complex geographic orientation of northeast-southwest. Gravel pits present on large hummocks display bedded and sorted sedimentary units of gravel, sand and gravel and climbing ripple laminated sand with folds, which demonstrate that the northern sector of the interlobate …
Mapping Latin America: A Cartographic Reader, Andrew Sluyter
Mapping Latin America: A Cartographic Reader, Andrew Sluyter
Faculty Publications
No abstract provided.
The Oxford Handbook Of Slavery In The Americas, Andrew Sluyter
The Oxford Handbook Of Slavery In The Americas, Andrew Sluyter
Faculty Publications
No abstract provided.
Spatial Resolution Imagery Requirements For Identifying Structure Damage In A Hurricane Disaster: A Cognitive Approach, Sarah E. Battersby, Michael E. Hodgson, Jiayu Wang
Spatial Resolution Imagery Requirements For Identifying Structure Damage In A Hurricane Disaster: A Cognitive Approach, Sarah E. Battersby, Michael E. Hodgson, Jiayu Wang
Faculty Publications
In disaster response, timely collection and exploitation of remotely sensed imagery is of increasing importance. Image exploitation approaches during the immediate (first few days) aftermath of a disaster are predominantly through visual analysis rather than automated classification methods. While the temporal needs for obtaining the imagery are fairly clear (within a one- to three-day window), there have only been educated guesses about the spatial resolution requirements necessary for the imagery for visual analysis. In this paper, we report results from an empirical study to identify the coarsest spatial resolution that is adequate for tasks required immediately following a major disaster. …
Using Self Organizing Maps To Analyze Demographics And Swing State Voting In The 2008 U.S. Presidential Election, Paul T. Pearson, Cameron I. Cooper
Using Self Organizing Maps To Analyze Demographics And Swing State Voting In The 2008 U.S. Presidential Election, Paul T. Pearson, Cameron I. Cooper
Faculty Publications
Emergent self-organizing maps (ESOMs) and k-means clustering are used to cluster counties in each of the states of Florida, Pennsylvania, and Ohio by demographic data from the 2010 United States census. The counties in these clusters are then analyzed for how they voted in the 2008 U.S. Presidential election, and political strategies are discussed that target demographically similar geographical regions based on ESOM results. The ESOM and k-means clusterings are compared and found to be dissimilar by the variation of information distance function.
Cuban Landscapes: Heritage, Memory, And Place, Mark M. Miller
Cuban Landscapes: Heritage, Memory, And Place, Mark M. Miller
Faculty Publications
No abstract provided.
Spatio-Temporal Analysis Of Crime Hotspots By Trajectories And Self-Organizing Maps, Marco Helbich, Julian Hagenauer, Michael Leitner
Spatio-Temporal Analysis Of Crime Hotspots By Trajectories And Self-Organizing Maps, Marco Helbich, Julian Hagenauer, Michael Leitner
Faculty Publications
The exploration of spatial relationships between crime incidents, the socio-economic characteristics of neighborhoods, as well as physical and structural compositions of the urban landscape is an ongoing research issue in Geographic Information Science. Spatial data mining tools improve the ability to gain knowledge from geographic data and help to understand spatio-temporal processes that contribute to the presence or absence of criminal offenses. However, most of the currently available tools focus either on the spatial, the temporal, or a combination of both aspects. But crime has a spatial and temporal component in a multidimensional attribute space. Therefore, it is reasonable to …
The Impact Of Racial Metric Variation In The Os Coxae On The Morphological Assessment Of Sex, Ginesse A. Listi
The Impact Of Racial Metric Variation In The Os Coxae On The Morphological Assessment Of Sex, Ginesse A. Listi
Faculty Publications
This study examines whether sex determination based on morphological traits in the os coxae is impacted by racial quantitative variation. Nineteen traits were evaluated independently by two observers in 876 os coxae. Chi-square test was used on a random sample of 400 individuals to assess whether the distribution of correct sex assessment varied for white and black individuals based on each trait individually and all 19 traits collectively, as well as on inter-observer agreement in correct sex assessment. Results indicate that accuracy of sex assessment varied between white and black individuals in certain individual traits; however, accuracy was not impacted …
Design Of A Comprehensive Geographic Information System For The Administration Of El Camino Real De Los Tejas National Historic Trail, Jeffrey M. Williams
Design Of A Comprehensive Geographic Information System For The Administration Of El Camino Real De Los Tejas National Historic Trail, Jeffrey M. Williams
Faculty Publications
Stephen F. Austin State University’s Arthur Temple College of Forestry and Agriculture’s (ATCOFA) Geographic Information Systems (GIS) Laboratory were engaged by the National Park Service (NPS) National Trails System-Intermountain Region to provide GIS services supporting the NPS’s development of a Comprehensive Management Plan for El Camino Real de los Tejas National Historic Trail (ELTE). The scope of work was completed under an agreement with the Gulf Coast Cooperative Ecosystem Studies Unit sponsored by the Texas AgriLife Research Program at Texas A&M University. ATCOFA assisted the NPS in the coordination of local landowner and other local stakeholder contacts, conducted archival research …
Assessing The Efficacy Of Modis Satellite-Derived Start Of Growing Season For Jurisdictional Determination Of East Texas Bottomland Hardwood Wetlands, Karen Malone, Hans Michael Williams, I-Kuai Hung, Daniel Unger
Assessing The Efficacy Of Modis Satellite-Derived Start Of Growing Season For Jurisdictional Determination Of East Texas Bottomland Hardwood Wetlands, Karen Malone, Hans Michael Williams, I-Kuai Hung, Daniel Unger
Faculty Publications
Introduction: Crucial to the determination of a jurisdictional wetland is the definition of “growing season”. Satellite imagery is being utilized in other ecological applications, but is lagging in wetland growing season determination. Both cost and temporal limitations historically have restrained use of satellite imagery in assessing the start up of the growing season. Multiple commercial satellites are available that provide high resolution imagery, but the cost are prohibitive for most studies. The National Aeronautics and Space Administration (NASA) and the U.S. Geological Survey (USGS) jointly manage the Landsat and the Moderate-resolution Imaging Spectroradiometer (MODIS) satellite programs. Landsat Enhanced Thematic Mapper …
Engaging With The Politics Of Determinist Environmental Thinking, Andrew Sluyter
Engaging With The Politics Of Determinist Environmental Thinking, Andrew Sluyter
Faculty Publications
No abstract provided.
In The Shadow Of Slavery: Africa’S Botanical Legacy In The Atlantic World, Andrew Sluyter
In The Shadow Of Slavery: Africa’S Botanical Legacy In The Atlantic World, Andrew Sluyter
Faculty Publications
No abstract provided.
The Geographical Review's Historical Dimensions And Recentism, Andrew Sluyter
The Geographical Review's Historical Dimensions And Recentism, Andrew Sluyter
Faculty Publications
No abstract provided.