Geography Commons^™

Delineating A Stream Network At Gale Crater, Mars, On Arcgis Pro: A Geographic Information Systems Approach, Elpidio Guzman De La Cruz

West Chester University Master’s Theses

The northwestern region of the Gale crater experienced flooding in the past. Delineation of stream networks for the northwestern region of Gale Crater, Mars employing geographic information systems (GIS) techniques is applied. The stream network produced by the algorithm in the study traverses the clay unit in Gediz Vallis, and visual HiRISE imagery analysis correlates with a topologic cross section of an inverted river channel of 750 meters wide and 90 meters deep. HiRISE imagery analysis further confirms a sulfate and clay stratigraphic unit in a stream 125 meters wide and 25 meters deep. Lastly, data smoothing procedures in the …

Using Gis To Better Understand The Cracker Community Of Pat's Island In The Ocala National Forest, Florida, Nicholas Kopp

Electronic Theses and Dissertations, 2020-2023

This research uses GIS methods to contextualize a Florida Cracker community in the Ocala National Forest. My case study is drawn from two seasons of fieldwork and supporting desktop surveys associated with Pat's Island, the home of multiple Cracker families. Cracker culture is historically categorized by its efforts to avoid modernization and prevent the commercialization of traditional lifeways in the quickly shifting society of late-19th and early 20th-century Florida. The geospatial expressions of these Cracker values are an emphasis on semi-remote living, adaptations to a unique environmental context, and the development of a semi-self-sufficient community. This research evaluates how GIS …

การประเมินผลผลิตกาแฟด้วยเทคนิคอากาศยานไร้คนขับ, สาวิตรี จันทร์สิงห์

Chulalongkorn University Theses and Dissertations (Chula ETD)

วัตถุประสงค์ของงานวิจัยนี้ เพื่อศึกษาปัจจัยที่เกี่ยวข้องกับการให้ผลผลิตกาแฟและเพื่อพัฒนาแบบจำลอง การประเมินผลผลิตกาแฟพันธุ์อาราบิกาจากข้อมูลที่ได้จากอากาศยานไร้คนขับ ในพื้นที่บ้านสันเจริญ อำเภอท่าวังผา จังหวัดน่าน โดยใช้แปลงตัวอย่าง 4 แปลง และมีช่วงระยะเวลาการเก็บเกี่ยวผลผลิตระหว่างปี 2021-2022 ผู้วิจัยใช้ปัจจัย ค่าความสูง ขนาดทรงพุ่ม เส้นรอบวงลำต้น และปัจจัยดัชนีความพืชพรรณความเขียวของพืชในช่วงคลื่นที่ตามองเห็น (VARI) ด้วยเทคนิคการวิเคราะห์แบบจำลองสมการทางคณิตศาสตร์และการประเมินความน่าเชื่อถือทางสถิติด้วยค่าสัมประสิทธิ์การตัดสินใจ (R2) และค่ารากที่สองของค่าความคลาดเคลื่อนกำลังสองเฉลี่ย (RMSE) ผลการวิจัย พบว่า สมการการประมาณค่าผลผลิตกาแฟของทั้ง 4 แปลง จากความสูง ขนาดทรงพุ่ม เส้นรอบวงลำต้น และ VARI สามารถอธิบายความผันแปรของผลผลิตได้ร้อยละ 74-88 และทุกตัวแปรมีผลต่อการคาดการณ์ผลผลิตกาแฟเฉลี่ยรายต้น อย่างมีนัยสำคัญที่ 95% ซึ่งปัจจัยที่ส่งผลต่อการคาดการณ์ปริมาณผลผลิตมากที่สุดคือเส้นรอบวงลำต้น (0.582) รองลงมาคือดัชนีพืชพรรณ VARI (0.411) ขนาดทรงพุ่ม (0.406) และความสูง (-0.401) เมื่อวิเคราะห์การประเมินจำนวนผลผลิตเฉลี่ยรายต้นของทุกแปลงจะมีค่า RMSE เท่ากับ 2.12 กิโลกรัมต่อต้น นอกจากนี้ผู้วิจัยได้นำสมการการคาดการณ์ผลผลิตเฉลี่ยรายต้นที่ได้ไปทดสอบกับแปลงตรวจสอบ พบว่ามีค่า RMSE เท่ากับ 2.37 กิโลกรัมเฉลี่ยต่อต้น การวิจัยนี้สามารถนำไปเป็นตัวอย่างของการใช้ข้อมูลจากอากาศยานไร้คนขับไปวางแผนผลผลิตเกษตรกรรมต่อไป

Modeling Spatial Access To Healthcare, Yaxiong Shao

Graduate Research Theses & Dissertations

Health disparity has been a persistent concern in the United States, and the COVID-19 pandemic has brought more attention to this ongoing challenge. Improving access to healthcare is a crucial step toward achieving health equity and starts with accurately measuring and portraying the existing landscape of access to healthcare. Even though numerous spatial accessibility models have been proposed to measure the spatial accessibility to healthcare, many gaps still exist. The main purpose of this dissertation is to develop novel models and leverage recently available datasets for a more accurate portrayal of true spatial accessibility. Three models were developed to address …

Dispossessed Again: Paiute Land Allotments In The Mono Basin, 1907-1929, Robert B. Marks

Eastern Sierra History Journal

Like most California Indians, the Kutzadika^a people in the Mono Basin on the east side of the Sierra Nevada Mountains were dispossessed of their land in the second half of the nineteenth century. However, they were not then removed to a reservation. They were left landless with no rights to reclaim their land until the Dawes Act (1887) made land allotments to non-reservation Indians possible. This article explores the history of land allotments in the Mono Basin, and places that story into the broader context of U.S. assimilationist policies but more importantly into the context of local history. Kutzadika …

Evaluation Of Low-Cost Radiometer For Surface Reflectance Re-Trieval And Orbital Sensor’S Validation, Dinithi Siriwardana Pathiranage

Electronic Theses and Dissertations

This paper evaluates the Arable Mark 2 sensor, an automated and low-cost radiometer, for its potential to retrieve surface reflectance data and validate orbital sensors such as the Landsat-8 (L8) Operational Land Imager (OLI) Level 2 product. While orbital sensors are widely used for monitoring solar radiation changes, managing natural resources, and understanding climatic trends, atmospheric effects can make it challenging to obtain accurate measurements. Equipped with multiple sensors, including long-wave and short-wave radiometers, the Arable Mark 2 sensor can measure upwelling and downwelling irradiance to calculate surface reflectance. To assess the accuracy and consistency of the Arable Mark 2 …

Extended Cross-Referenced Analysis Using Data From The Landsat 8 And 9 Underfly Event, Garrison Gross

Electronic Theses and Dissertations

The Landsat 8 and 9 Underfly Event occurred in November 2021, where Landsat 9 flew beneath Landsat 8 in the final stages before settling in its final orbiting path. An analysis was performed on the images taken during this event, which resulted in a cross-referenced with uncertainties estimated to be less than 0.5%. This level of precision was due in part to the near-identical sensors aboard each instrument as well as the underfly event itself, which allowed the sensors to take nearly the exact same image at nearly the exact same time. This initial calibration was applied before the end …

The Development Of Dark Hyperspectral Absolute Calibration Model Using Extended Pseudo Invariant Calibration Sites At A Global Scale: Dark Epics-Global, Padam Bahadur Karki

Electronic Theses and Dissertations

This research aimed to develop a novel dark hyperspectral absolute calibration (DAHAC) model using stable dark targets of "Global Cluster - 36" (GC-36), one of the clusters from "300 Class Global Classification." The stable dark sites were identified from GC-36 called "Dark EPICS-Global" covering the surface types viz; dark rock, volcanic area, and dark sand. The Dark EPICS-Global shows a temporal variation of 0.02 unit reflectance. This work uses the Landsat-8 (L8) Operational Land Imager (OLI) , Sentinel-2A (S2A) Multispectral Instrument (MSI) , and Earth Observing One (EO-1) Hyperion data for the DAHAC model development, where well-calibrated L8 and S2A …

“For Posterity, It’S Something Important To Do”: Festivals, Digital Practices, And Conserving Community Heritage, Enya Moore Dr.

Presentations

This presentation highlights the importance of preserving arts festival activities and uses empirical evidence to underline the significance of the digital turn for archiving this kind of intangible heritage. As Del Barrio et al (2012, pp. 235) argue, cultural festivals are an emblematic example of immaterial cultural heritage, 'since they are experience goods which expire at the moment they are produced and not only express artistic innovations in the field but also draw on previous cultural background, perceived as accumulated cultural capital’ . Data gathered through qualitative fieldwork with rural festival makers are used to explore the potential that digitising …

Grain-Washing: The Issue With Corn Ethanol As A Sustainable Aviation Fuel, Emily J. Rinn

Scripps Senior Theses

Decarbonizing the aviation sector remains one of the most prevalent obstacles in reducing the United States’ significant contribution to global greenhouse gas emissions. Launched in 2021, the Sustainable Aviation Fuel (SAF) Grand Challenge aims to supply enough fuel to meet 100% of demand by 2050 through reducing its production costs and enhancing its sustainable practices. Corn ethanol feedstock has been proposed to make up as much as half of all SAF production in the 2030 benchmark. This thesis explores the assemblage of corn ethanol – from its true environmental impacts, role in the future SAF market, to research claiming corn …

Migrant-Activist Evidentiary Practices In The Aegean Sea, Beatrice A. Abbott

Theses and Dissertations--Geography

This project examines digital maps and images made by migrants and activists traversing or helping others to traverse the Greek-Turkish maritime border in 2015 and early 2016, when over a million people arrived to European shores, mostly by way of the Aegean Sea. These maps were made using applications such as Google Maps, Bing Maps, Maps.me, and WhatsApp and circulated on public Facebook groups and pages. Through a visual analysis of these digital artifacts, I look at how they can be read to witness and contest deadly border geographies produced through migratory policies and practices of deterrence. Further, I argue …

Hoarding Lifesaving Knowledge While Millions Die: The Political Economy Of Global Covid-19 Vaccine Apartheid, Kenneth Stancil

Theses and Dissertations--Geography

Coronavirus vaccines saved millions of lives, but experts estimate that the suboptimal production and inequitable distribution of shots resulted in nearly 3 million preventable Covid-19 deaths in 2021 and 2022 as well as millions of indirect deaths during the pandemic. These avoidable fatalities are inseparable from the grotesquely unequal vaccination rates between rich and poor nations. Dose hoarding by high-income countries contributed to vaccine inequality, but the “vaccine apartheid” inflicted on low-income countries reflects an even more fundamental injustice: knowledge hoarding by profit-maximizing pharmaceutical corporations—aided and abetted by wealthy governments—which deprived generic manufacturers of the right to produce additional lifesaving …

The Rise Of Native Lordships At Pashash, A.D. 200–600, North Highlands Of Ancash, Peru, George F. Lau, Milton Luján Dávila, Jacob L. Bongers, David Chicoine

Faculty Publications

This article examines the rise of native, segmentary lordships in the highlands of north-central Peru. It reports on new excavations and mapping at the seat of a prehispanic polity, Pashash (Recuay culture), a large hilltop center that developed after the collapse of Chavín civilization. Fieldwork revealed monumental constructions and two special activity contexts radiocarbon-dated to ca. a.d. 200–400: an offering area in a large palatial compound and a room-complex with chambers closed off and sealed with feasting refuse. Multiple lines of evidence help reconstruct a regional picture for the establishment of wealthy local elites. Cultural innovations explicitly link new leaders …

Briquetage And Brine: Living And Working At The Classic Maya Salt Works Of Ek Way Nal, Belize, Heather Mckillop, E. Cory Sills

Faculty Publications

Systematic flotation survey and spatial analysis of artifacts at the submerged salt work of Ek Way Nal reveal evidence of a residence, salt kitchens, and additional activities. Ek Way Nal is one of 110 salt works associated with a Late to Terminal Classic (A.D. 600-900) salt industry known as the Paynes Creek Salt Works. Wooden posts that form the walls of 10 buildings are remarkably preserved in a peat bog below the sea floor providing an opportunity to examine surface artifacts in relation to buildings. Numerous salt kitchens have been located at the Paynes Creek Salt Works by evidence of …

Disparities In Spatial Accessibility Of Primary Care In Louisiana: From Physical To Virtual Accessibility, Fahui Wang, Yutian Zeng, Lingbo Liu, Tracy Onega

Faculty Publications

Telehealth has been widely employed and has transformed how healthcare is delivered in the United States as a result of COVID-19 pandemic. While telehealth is utilized and encouraged to reduce the cost and travel burden for access to healthcare, there are debates on whether telehealth can promote equity in healthcare services by narrowing the gap among diverse groups. Using the Two-Step Floating Catchment Area (2SFCA) and Two-Step Virtual Catchment Area (2SVCA) methods, this study compares the disparities of physical and virtual access to primary care physicians (PCPs) in Louisiana. Both physical and virtual access to PCPs exhibit similar spatial patterns …

A Cyclically Adjusted Spatio-Temporal Kernel Density Estimation Method For Predictive Crime Hotspot Analysis, Ya Han, Yujie Hu, Haojie Zhu, Fahui Wang

Faculty Publications

This paper presents a new method for predictive crime hotspot analysis that further improves the kernel density estimation (KDE) method and the spatio-temporal kernel density estimation (STKDE) method by accounting for temporal crime cycles and is therefore termed the ‘cyclically adjusted STKDE (cSTKDE) method’. The case study on robbery incidents in Baton Rouge, Louisiana, shows a temporal cycle with a 6-month period of statistical significance from January 2010 to May 2018. This identified period is incorporated into the temporal kernel function of the new cSTKDE method. For validation, the Forecast Accuracy Index (FAI) and Forecast Precision Index (FPI) are used …

Exploring The Spatial Autocorrelation In Soil Moisture Networks: Analysis Of The Bias From Upscaling The Texas Soil Observation Network (Txson), Yaping Xu, Cuiling Liu, Lei Wang, Lei Zou

Faculty Publications

Microwave remote sensing such as soil moisture active passive (SMAP) can provide soil moisture data for agricultural and hydrological studies. However, the scales between station-measured and satellite-measured products are quite different, as stations measure on a point scale while satellites have a much larger footprint (e.g., 9 km). Consequently, the validation for soil moisture products, especially inter-comparison between these two types of observations, is quite a challenge. Spatial autocorrelation among the stations could be a contribution of bias, which impacts the dense soil moisture networks when compared with satellite soil moisture products. To examine the effects of spatial autocorrelation to …

An Analysis Of Urban Land Use Land Cover (Lulc) Changes In Lilongwe City, Central Malawi (2002–2022), Zola Manyungwa

Graduate Theses, Dissertations, and Problem Reports (ETD)

Lilongwe, Malawi’s capital city, has grown nearly tenfold in the last 40 years with a 4-5% annual population growth rate, and the city’s population is projected to double over the next decade. Rural to urban migration and natural increase are the driving factors of the city’s urban expansion. Characterised by the urbanisation of poverty, Lilongwe is experiencing uncontrolled and unplanned urban expansion that has led to the growth of informal settlements. Urbanisation leads to land use land cover (LULC) changes that negatively impact the quality of life and the environment. Lilongwe faces many challenges, including high levels of poverty, inequality, …

Synergies Between Residents: Evaluating Support And Concerns Of Recreation And Tourism Economic Development Within The Monongahela National Forest Region, Morgan R. Martin

Graduate Theses, Dissertations, and Problem Reports (ETD)

Tourism has continually been presented as a growing economic sector around the world. Having become an area of increased interest for diversifying rural economies, tourism is an attractive alternative to the declining traditional economic engines of rural communities like agriculture, forestry, and mining. Rural destinations have become increasingly attractive to outside visitors who seek to pursue activities embedded within the local culture and distinctive attractive assets available in rural regions. The USDA has recognized the increasing importance of recreation and tourism economies as an emerging or priority area of national need and an effective means for rural development. Even with …

Distributed Energy Infrastructure Development: Geospatial & Economic Feasibility In Rural West Virginia, Xinming Andy Zhang

Graduate Theses, Dissertations, and Problem Reports (ETD)

Energy transition from conventional to centralized power plants, including coal-fired units, is critical for West Virginia’s long-term energy and economic future. The socioeconomic downturn in West Virginia was deeply connected with the dependence on the centralized coal industry and the coal economy. Most traditional coal communities in rural West Virginia struggle to maintain economic viability, potentially leading to outmigrations and poor energy resilience. I investigated the possibility of introducing community-sized distributed energy systems in these rural communities to improve energy resilience and accommodate the future transition from centralized coal-generated energy.

My goal was to identify rural regions where distributed energy …