Geography Commons^™

การประเมินปริมาณคาร์บอนของป่าชุมชน ด้วยเทคนิคอากาศยานไร้คนขับ: กรณีศึกษาป่าชุมชนบ้านบุตาต้อง ตำบลนากลาง อำเภอสูงเนิน จังหวัดนครราชสีมา, ธนวิทย์ ถมกระจ่าง

Chulalongkorn University Theses and Dissertations (Chula ETD)

การวิจัยครั้งนี้ผู้วิจัยมีแนวคิดที่ประยุกต์ใช้อากาศยานไร้คนขับ (Unmanned Aerial Vehicle : UAV) เพื่อประเมินปริมาณคาร์บอนกักเก็บของป่าชุมชนบ้านบุตาต้อง ตำบลนากลาง อำเภอสูงเนิน จังหวัดนครราชสีมา โดยการใช้ข้อมูลกลุ่มจุดสามมิติ (Point Could) ที่ได้จากการประมวลผลของภาพถ่ายทางอากาศที่ได้จากอากาศยานไร้คนขับ เพื่อนำมาสร้างแบบจำลองความสูงสิ่งปกคลุมพื้นผิวเชิงเลข (Digital Surface Model : DSM) และแบบจำลองความสูงภูมิประเทศเชิงเลข (Digital Elevation Model :DEM) จากนั้นทำการหาความสูงของต้นไม้โดยการหาค่าต่างระหว่างของแบบจำลองดังกล่าว นอกจากนั้นผู้วิจัยได้ทำการกำหนดแปลงตัวอย่างถาวรขนาด 40 × 40 เมตร จำนวน 10 แปลง เพื่อสำรวจเก็บข้อมูลขนาดเส้นผ่านศูนย์กลางเพียงอกและความสูงต้นไม้ เพื่อใช้ในการประเมินความถูกต้องของข้อมูลที่ได้จากอากาศยานไร้คนขับ ในการหามวลชีวภาพเหนือพื้นดินผู้วิจัยใช้สมการแอลโมเมตรี (allometric equations) ประเภทป่าเต็งรัง ผลการวิจัยพบว่าความสูงที่ได้จากข้อมูลอากาศยานไร้คนขับมีความสัมพันธ์กับภาคสนามโดยมีค่า R2 อยู่ที่ 0.715-0.898 และมีความคลาดเคลื่อนของความสูงต้นไม้อยู่ที่ 0.50-0.66 เมตร ปริมาณคาร์บอนทั้งพื้นที่ศึกษามี 1.54 ตัน/ไร่ ซึ่งเมื่อเปรียบเทียบกับปริมาณคาร์บอนกักเก็บในแปลงตัวอย่างพบว่ามีความคลาดเคลื่อนอยู่ที่ร้อยละ 13-59 ซึ่งความคลาดเคลื่อนดังกล่าวมาจากความคลาดเคลื่อนในการประมาณขนาดเส้นผ่านศูนย์กลางเพียงอกจากข้อมูลความสูงต้นไม้ที่ได้จากอากาศยานไร้คนขับเนื่องจากความสัมพันธ์ดังกล่าวไม่มีความชัดเจน จากนั้นผู้วิจัยได้ทำการหาขนาดพื้นที่ที่เหมาะสมในการหาปริมาณคาร์บอนกักเก็บพบว่าขนาดพื้นที่มากกว่า 25×25 เมตรมีความเหมาะสมสำหรับกรหาปริมาณคาร์บอนกักเก็บในพื้นที่ศึกษา

No-Place, New Places: Death And Its Rituals In Urban Asia, Lily Kong

Research Collection School of Social Sciences

In many Asian cities, particularly those that confront increasing land scarcity, the conversion from burial to cremation has been encouraged by state agencies in the last several decades. From Hong Kong to Seoul to Singapore, planning agencies have sought to reduce the use of space for the dead, in order to release land for the use of the living. More secular guiding principles regarding efficient land use in these cities had originally come up against the symbolic values invested in burial spaces, resulting in conflicts between different value systems. In more recent years, however, the shift to cremation and columbaria …

Evaluating Hourly Rainfall Characteristics Over The U.S. Great Plains In Dynamically Downscaled Climate Model Simulations Using Nasa-Unified Wrf, Huikyo Lee, Duane E. Waliser, Robert Ferraro, Takamichi Iguchi, Christa D. Peters-Lidard, Baijun Tian, Paul C. Loikith, Daniel B. Wright

Geography Faculty Publications and Presentations

Accurate simulation of extreme precipitation events remains a challenge in climate models. This study utilizes hourly precipitation data from ground stations and satellite instruments to evaluate rainfall characteristics simulated by the NASA-Unified Weather Research and Forecasting (NU-WRF) regional climate model at horizontal resolutions of 4, 12, and 24 km over the Great Plains of the United States. We also examined the sensitivity of the simulated precipitation to different spectral nudging approaches and the cumulus parameterizations. The rainfall characteristics in the observations and simulations were defined as an hourly diurnal cycle of precipitation and a joint probability distribution function (JPDF) between …

Urban Non-Timber Forest Products Stewardship Practices Among Foragers In Seattle, Washington (Usa), Rebecca J. Mclain, Melissa R. Poe, Lauren S. Urgenson, Dale Blahna, Lita P. Buttolph

Geography Faculty Publications and Presentations

Our research seeks to expand the concept of urban environmental stewardship to include the everyday stewardship practices of urban nontimber forest products foragers. Ethnographic data from 58 urban foragers and 18 land stewards in the city of Seattle (USA) revealed that foragers reported using a variety of practices to enhance and minimize negative desirable species and their habitats. Many of these practices were identical to those practiced by restoration volunteers in formal programs and align with Seattle Parks Department management objectives. Foragers actively sought to learn more about what practices are sustainable; many mentored others in sustainable harvesting practices. Most …

Oceans Of Space, Stephanie Steinbrecher '16

EnviroLab Asia

"Oceans of Space" relates my observations of the 2016 EnviroLab Asia Clinic Trip to Singapore and Sarawak, Malaysia. In this meditation, the concept of space serves as a lens to examine assumptions of geopolitical, historical, and philosophical positioning—regionally and globally. At the center of my inquiry is EnviroLab's connection to the Dayak communities in Baram, Sarawak. This region is experiencing dramatic social and ecological change as a result of industrial development. By triangulating my subjective impressions of this space, various knowledge systems, and the qualitative data EnviroLab gathered in Southeast Asia, I aim to untangle some paradoxes that complicate the …

The Evolution Of A Volunteer Lake Protection Program, Maggie Shannon, Alexa A.E. Junker, Philip J. Nyhus, Cathy R. Bevier, Russell Cole

Philip J. Nyhus

No abstract provided.

Assessing Lakesmart, A Community-Based Lake Protection Program

Philip J. Nyhus

Creating Community Resilience Through Elder-Led Physical And Social Infrastructure, Daniel P. Aldrich, Emi Kiyota

Daniel P Aldrich

All Politics Is Local: Judicial And Electoral Institutions’ Role In Japan’S Nuclear Restarts, Daniel P. Aldrich, Timothy Fraser

Daniel P Aldrich

Review Of Cultural Forests Of The Amazon: A Historical Ecology Of People And Their Landscapes By William Balée, Maria Gabriela Zurita-Benavides

Tipití: Journal of the Society for the Anthropology of Lowland South America

No abstract provided.

Mapping Neighborhood Scale Survey Responses With Uncertainty Metrics, Charles R. Ehlschlaeger, Yizhao Gao, James D. Westervelt, Robert C. Lozar, Marina V. Drigo, Jeffrey A. Burkhalter, Carey L. Baxter, Matthew D. Hiett, Natalie R. Myers, Ellen R. Hartman

Journal of Spatial Information Science

This paper presents a methodology of mapping population-centric social, infrastructural, and environmental metrics at neighborhood scale. This methodology extends traditional survey analysis methods to create cartographic products useful in agent-based modeling and geographic information analysis. It utilizes and synthesizes survey microdata, sub-upazila attributes, land use information, and ground truth locations of attributes to create neighborhood scale multi-attribute maps. Monte Carlo methods are employed to combine any number of survey responses to stochastically weight survey cases and to simulate survey cases' locations in a study area. Through such Monte Carlo methods, known errors from each of the input sources can be …

Provenance And Credibility In Spatial And Platial Data, Grant Mckenzie, Martin Raubal, Krzysztof Janowicz, Andrew Flanagin

Journal of Spatial Information Science

No abstract provided.

Trajectory Data Mining: A Review Of Methods And Applications, Jean Damascène Mazimpaka, Sabine Timpf

Journal of Spatial Information Science

The increasing use of location-aware devices has led to an increasing availability of trajectory data. As a result, researchers devoted their efforts to developing analysis methods including different data mining methods for trajectories. However, the research in this direction has so far produced mostly isolated studies and we still lack an integrated view of problems in applications of trajectory mining that were solved, the methods used to solve them, and applications using the obtained solutions. In this paper, we first discuss generic methods of trajectory mining and the relationships between them. Then, we discuss and classify application problems that were …

Enhancing Building Footprints With Squaring Operations, Imran Lokhat, Guillaume Touya

Journal of Spatial Information Science

Whatever the data source, or the capture process, the creation of a building footprint in a geographical dataset is error prone. Building footprints are designed with square angles, but once in a geographical dataset, the angles may not be exactly square. The almost-square angles blur the legibility of the footprints when displayed on maps, but might also be propagated in further applications based on the footprints, e.g., 3D city model construction. This paper proposes two new methods to square such buildings: a simple one, and a more complex one based on nonlinear least squares. The latter squares right and flat …

Mixed Map Labeling, Maarten Löffler, Martin Nöllenburg, Frank Staals

Journal of Spatial Information Science

Point feature map labeling is a geometric visualization problem, in which a set of input points must be labeled with a set of disjoint rectangles (the bounding boxes of the label texts). It is predominantly motivated by label placement in maps but it also has other visualization applications. Typically, labeling models either use internal labels, which must touch their feature point, or external (boundary) labels, which are placed outside the input image and which are connected to their feature points by crossing-free leader lines. In this paper we study polynomial-time algorithms for maximizing the number of internal labels in a …

Editorial, Matt Duckham

Journal of Spatial Information Science

No abstract provided.

Denver Food Deserts, Emily Connor

Ursidae: The Undergraduate Research Journal at the University of Northern Colorado

Over time, socioeconomic factors, store type, and transportation distance have defined what types of foods are available to residents in urban areas and determining the overall well-being of people in that area, especially when it comes to obesity. Most cities, in one way or another, have neighborhoods that have these factors and create what is known as a food desert. Much like a desert lacking in water, a food desert lacks the availability of nutritious foods, and Denver is no exception. While Denver is known to be a healthy city, there are areas that share similar socioeconomic factors, store types, …

Sequias En El Sur De La Peninsula De Yucatan: Analisis De La Variabilidad Anual Y Estacional De La Precipitacion (Droughts In The Southern Yucatan Peninsula: Analysis Of The Annual And Seasonal Precipitation Variability), Sofia Mardero, Elsa Nickl, Birgit Schmook, Laura Schneider, John Rogan, Zachary Christman, Deborah Lawrence

Zachary Christman

Paper is in Spanish. English abstract: This study analyzes the spatial and temporal variability of precipitation across the Southern Yucatán Peninsula in Mexico, addressing the anomalies and trends of annual and seasonal precipitation as well as the occurrence of meteorological droughts, using rainfall data from nine weather stations during the period 1953-2007. Linear regression in the annual and seasonal rainfall were used to analyze the increase or decrease in precipitation trends over this period. Precipitation anomalies enabled the evaluation of the stability, deficit, or surplus of precipitation for each year or season, and a quintile method was used to …

Distinguishing Land Change From Natural Variability And Uncertainty In Central Mexico With Modis Evi, Trmm Precipitation, And Modis Lst Data, Zachary Christman, John Rogan, J. Ronald Eastman, B. L. Turner Ii

Zachary Christman

Precipitation and temperature enact variable influences on vegetation, impacting the type and condition of land cover, as well as the assessment of change over broad landscapes. Separating the influence of vegetative variability independent and discrete land cover change remains a major challenge to landscape change assessments. The heterogeneous Lerma-Chapala-Santiago watershed of central Mexico exemplifies both natural and anthropogenic forces enacting variability and change on the landscape. This study employed a time series of Enhanced Vegetation Index (EVI) composites from the Moderate Resolution Imaging Spectoradiometer (MODIS) for 2001–2007 and per-pixel multiple linear regressions in order to model changes in EVI as …

The New Normal? Climate Variability And Ecoviolence In Sub-Saharan Africa, Alfonso Sanchez

University of New Orleans Theses and Dissertations

Climate change presents a wide range of concerns that can jeopardize international security. Among those concerns are neo-Malthusian worries of diminishing natural resources. Predictive models suggest that rainfall and temperature anomalies have the potential to reduce water basins, crop production, increase land degradation among other perils that threaten human security. This concern is particularly true in sub-Saharan Africa given the region’s strong dependence on rain-fed agriculture. Despite strong claims from various world leaders and scientists of a direct climate-conflict nexus, little empirical evidence has been devoted to find a systematic causal pathway of this kind. What is more, the literature …