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Articles 5281 - 5310 of 12357

Full-Text Articles in Geography

Investigation Of Spectral Variation Of Pine Needles As An Indicator Of Arsenic Content In Soils, Ji Hye Shin, Jaehyung Yu, Lei Wang, Jieun Kim, Sang Mo Koh Aug 2019

Investigation Of Spectral Variation Of Pine Needles As An Indicator Of Arsenic Content In Soils, Ji Hye Shin, Jaehyung Yu, Lei Wang, Jieun Kim, Sang Mo Koh

Faculty Publications

The spectral response to arsenic (As) stress of pine needles (Pinus densiflora Siebold and Zucc.) from an abandoned lead (Pb)–zinc (Zn) mine was investigated based on chemical and spectroscopic analyses. The correlation analysis between the content of As in needle samples and that of soils and spectral parameters of the needle samples were conducted. The results showed very high correlation between As content in pine needles and soils. The major spectral response of pine needles to the As stress were characterized by the increase in the green and red color reflectance, the decrease in the first derivatives at 1648 nm, …


Urban (Un)Planning And Social Vulnerability In The Context Of Rapid Urbanization And Data Constraints: A Quantitative Study Of Dar Es Salaam, Tanzania., Sheliza Bhanjee Aug 2019

Urban (Un)Planning And Social Vulnerability In The Context Of Rapid Urbanization And Data Constraints: A Quantitative Study Of Dar Es Salaam, Tanzania., Sheliza Bhanjee

Electronic Theses and Dissertations

This dissertation explores intersections between vulnerability and urban planning in Sub-Saharan Africa, where distinct forms of urbanization are occurring and where there are significant data constraints limiting local studies and urban assessments in the region. The three studies which make up this dissertation offer methodological and theoretical pathways toward examining and measuring the influence of urbanization and planning factors on vulnerability of urban populations in the region. The first study is a literature review and examines existing literature for vulnerability conceptualization in urban environments, the notion of ‘urban vulnerability’, and roles of urban planning and related factors in relation to …


Methodological Advances For Understanding Social Connectivity And Environmental Implications In Multi-Use Landscapes, Matthew Clark Aug 2019

Methodological Advances For Understanding Social Connectivity And Environmental Implications In Multi-Use Landscapes, Matthew Clark

Boise State University Theses and Dissertations

Integrated social-ecological systems research is challenging; complicated feedback and interactions across scales in multi-use landscapes are difficult to decouple. Novel methods and innovative data sources are needed to advance social-ecological systems research. In this thesis, we use network science as a means of explicitly assessing feedback between social and ecological systems, and internet search data to better predict visitation in protected areas. This thesis seeks to provide empirical examples of emerging social-ecological systems science methods as a precedent for resource managers on-the-ground, as well as extending the line of scientific inquiry on the subject

In the first chapter of this …


Study Of Physical Environment Based On Land System Map Of Kabupaten Bandung, Mutia Kamalia Mukhtar, Nurwadjedi Nurwadjedi Aug 2019

Study Of Physical Environment Based On Land System Map Of Kabupaten Bandung, Mutia Kamalia Mukhtar, Nurwadjedi Nurwadjedi

Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments)

The environmental damage in Kabupaten Bandung is critical. To solve the environmental problems, the integrated spatial data of the physical environment is required. Land system data as the integrated spatial data which describes the characteristics of land are useful for the analysis and evaluation of the environmental conditions. The objective of the study is to describe the characteristics of the physical environment of Kabupaten Bandung based on the land system map for the input of decision-making in achieving sustainable development. The study used the spatial analysis and descriptive analytical method. The land system data was obtained from the Badan Informasi …


Mapping Land Cover Based On Time Series Synthetic Aperture Radar (Sar) Data In Klaten, Indonesia, Vidya Nahdiyatul Fikriyah Aug 2019

Mapping Land Cover Based On Time Series Synthetic Aperture Radar (Sar) Data In Klaten, Indonesia, Vidya Nahdiyatul Fikriyah

Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments)

Information on the existing land cover is important for land management and planning because it can represent the intensity, location, and pattern of human activities. However, mapping land cover in tropical regions is not easy when using optical remote sensing due to the scarcity of cloud-free images. Therefore, the objective of this study is to map the land cover in Klaten Regency using a time-series Sentinel-1 data. Sentinel-1 data is one of remote sensing images with Synthetic Aperture Radar (SAR) system which is well known by its capability of cloud penetration and allweather observation. A time-series Sentinel-1 data of both …


Ekstraksi Digital Surface Model (Dsm) Dari Data Unmanned Aerial Vehicle (Uav) Berbasis Point Cloud, Indra Laksana, R Suharyadi, M Pramono Hadi Aug 2019

Ekstraksi Digital Surface Model (Dsm) Dari Data Unmanned Aerial Vehicle (Uav) Berbasis Point Cloud, Indra Laksana, R Suharyadi, M Pramono Hadi

Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments)

Data acquisition using unmanned aircraft is increasingly being done. This study models elevation data from field measurements using unmanned aircraft. The purpose of this study: (1) to test the ability of unmanned aircraft to acquire elevation data, and (2) to compare elevation data if added point cloud data and bathymetry measurement data. The processing method using point cloud data is done by first matching key points. Matching key points links all aerial photography results to forming a single unit area that has been photographed. Next, a tie point is carried out in the area formed from matching key points. Tie …


Spatial Analysis Of Coastline Change By Remote Sensing In The North Coast Of Karawang Regency, Roberto Pasaribu, Firman Agus H, Liliek Soeprijadi Aug 2019

Spatial Analysis Of Coastline Change By Remote Sensing In The North Coast Of Karawang Regency, Roberto Pasaribu, Firman Agus H, Liliek Soeprijadi

Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments)

The existence of the coast in the northern part of Karawang Regency is very worrying. Seawater that was far up to tens of meters from the side of the road, is now on the lip of the road, even some parts of the road are cut off due to abrasion of seawater. Some villages were affected by abrasion erosion. One of the effects of damage due to abrasion and sedimentation is the occurrence of shoreline changes. This change in coastline will affect people's lives and spatial planning for the development of the area. For this reason, this study aims to …


The Structure And Dynamics Of A River Delta Are Related Through Its Nourishment Area, Suggesting Optimality, Christopher A. Cathcart Aug 2019

The Structure And Dynamics Of A River Delta Are Related Through Its Nourishment Area, Suggesting Optimality, Christopher A. Cathcart

Graduate Theses and Dissertations

Scaling relations in tributary network geomorphology are well understood with respect to optimality. However, the scaling relations between structure and dynamics in distributary network geomorphology are less well understood. This is primarily due to the fact that nourishment area boundaries are difficult to map compared to tributary network catchment area boundaries. Furthermore, most previous work has focused either on the distributary channel networks or the delta’s partitioning of discharge. Here we show that, on the Wax Lake Delta (WLD) in Louisiana, the asymmetry in nourishment areas and downstream nourishment boundary width (∏) at a channel bifurcation, acts as a control …


Born And Raised - Native Nevadans, Madison Frazee-Bench, Caitlin Saladino, William E. Brown Aug 2019

Born And Raised - Native Nevadans, Madison Frazee-Bench, Caitlin Saladino, William E. Brown

Demography

This Fact Sheet highlights population shifts and investigates the adult population of Nevada counties. Data from a 2017 GOVERNING report details Nevada’s counties and their populations.


Automation Of State Climate Office Processes & Products: Developing Efficient Approaches For Data Dissemination, Michael Shoop Aug 2019

Automation Of State Climate Office Processes & Products: Developing Efficient Approaches For Data Dissemination, Michael Shoop

Electronic Theses and Dissertations

State Climate Offices (SCO’s) in the United States are critical conduits for improving weather and climate data in local communities. Two states do not have a state-recognized SCO: Tennessee and Massachusetts. Efforts are underway at East Tennessee State University to develop the Tennessee Climate Office (TCO). Currently, climate services and products are severely lacking across Tennessee. This thesis provides an improved methodology for an existing TCO product and outlines the development of a new product using Python scripting. Daily storm reports within the monthly climate report are automated and a Weather Forecasts Hazard Index (WFHI) web application is developed. Both …


Spatiotemporal Variability Of Twenty‐First‐Century Changes In Site‐Specific Snowfall Frequency Over The Northwest United States, Arielle J. Catalano, Paul C. Loikith, C. M. Aragon Aug 2019

Spatiotemporal Variability Of Twenty‐First‐Century Changes In Site‐Specific Snowfall Frequency Over The Northwest United States, Arielle J. Catalano, Paul C. Loikith, C. M. Aragon

Geography Faculty Publications and Presentations

In the Northwest United States, warming temperatures threaten mountain snowpacks. Reliable projections of snowfall changes are therefore critical to anticipate the timeline of change. However, producing such projections is challenging, as most state‐of‐the‐art climate models are limited in sufficiently resolving influential topography. Here we leverage atmospheric freezing level to estimate precipitation phase and project twenty‐first‐century snowfall frequency change at Snowpack Telemetry Network stations across the Northwest. Under “moderate” and “business‐as‐usual” emission pathways in Coupled Model Intercomparison Project phase 5 models, snowfall frequency is projected to decline at all stations. Business‐as‐usual declines accelerate after midcentury at most locations, whereas moderate declines …


Dynamics Of Land Use, Environment, And Social Organization In The Sasanian Landscape Of Eastern Iraq—Western Iran, Mitra Panahipour Aug 2019

Dynamics Of Land Use, Environment, And Social Organization In The Sasanian Landscape Of Eastern Iraq—Western Iran, Mitra Panahipour

Graduate Theses and Dissertations

Understanding human-environment interactions has been one of the main challenges in archaeological studies over recent years. Past research on the Near Eastern territorial empires in general, and the Sasanian Empire in particular, primarily emphasized the dominant role of human on landscape transformation. In addition, politically centralized schemes such as agricultural intensification and expansion of water supply systems have been at the center of most of the discussions and remained the main hypothesis of the Sasanian land use practices.

This dissertation investigates population’s diverse responses to environmental variability during the Sasanian period (224-651 CE) across a landscape in eastern Iraq—western Iran. …


The War On Winter: How Americans Put Down Roots On The Northern Plains, 1854-1949, Daniel J. Fischer Aug 2019

The War On Winter: How Americans Put Down Roots On The Northern Plains, 1854-1949, Daniel J. Fischer

Graduate Theses and Dissertations

My dissertation is a study of how the United States was able to expand onto the Northern Great Plains, consisting of the Dakotas, Nebraska, and the eastern parts of Wyoming and Montana, between 1854 and 1949 despite the threat to property, comfort, and survival posed by the region’s harsh winters, which brought intense cold, large snowdrifts, and blinding blizzards. This dissertation argues that five tools – government programs, rapidly changing technology, imagination, strong local communities, and toughness – allowed native-born Americans and European immigrants to survive and become increasingly secure in the region. But it also argues that severe gaps …


The Effects Of Geography And Proximity On Board Of Directors: An Exponential Random Graphs Approach, Panagiotis Giannakis Aug 2019

The Effects Of Geography And Proximity On Board Of Directors: An Exponential Random Graphs Approach, Panagiotis Giannakis

Graduate Theses and Dissertations

This dissertation aims at exploring how physical proximity, among other geographical elements, affects the synthesis of boards of directors, the decisions executives make, and, in general, organizations. Drawing on the rich literature in economic geography, these studies focus on re-evaluating the effects of geography on board of directors in the contemporary context characterized by significant technological advancements which is expected to minimize the effects of distance.

The first paper evaluates the geographic proximity effects on the likelihood of board interlock ties creation, while controlling for endogenous network processes. Additionally, all proposed network specifications are simulated in order to assess the …


Drug Trafficking, State Capacity, And The Post-Soviet Condition In The Kyrgyz Republic, Christopher George Cowan Aug 2019

Drug Trafficking, State Capacity, And The Post-Soviet Condition In The Kyrgyz Republic, Christopher George Cowan

Graduate Theses and Dissertations

Following the collapse of the Soviet Union, the newly independent states of Central Asia faced numerous challenges. These included cultivating new national identities and state capacity, managing new borders, and addressing issues of conflict and political violence. Converging with these challenges – a booming trade in opium and heroin originating in neighboring Afghanistan. Central Asia quickly became a key route for opiates originating in Afghanistan and transiting to Russia and Europe. The Kyrgyz Republic lies at the southeastern corner of this region, along one of the world’s busiest drug trafficking routes.

This thesis examines state and societal responses to narcotics …


Lidar-Based Sinkhole Detection And Mapping In Knox County, Tennessee, J Clint Shannon, David Moore, Yingkui Li, Cathy Olsen Jul 2019

Lidar-Based Sinkhole Detection And Mapping In Knox County, Tennessee, J Clint Shannon, David Moore, Yingkui Li, Cathy Olsen

Pursuit - The Journal of Undergraduate Research at The University of Tennessee

Sinkholes are one of the major causes of damage to roads, buildings, and other infrastructure throughout the US. Sinkholes near or on roads are especially costly and occasionally deadly. Knox County and much of East Tennessee are located within karst areas (comprised of porous and soluble limestone and dolomite), deeming it at risk for sinkholes. Currently, Knox County uses contour maps to manually identify sinkholes. Supported by a geographic information system (GIS), we developed a streamlined model to identify the locations and extents of potential sinkholes using 1.3-ft resolution LiDAR (Light Detection and Ranging) data and applied it to the …


Understanding Cumulative Hazards In A Rustbelt City: Integrating Gis, Archaeology, And Spatial History, Daniel Trepal, Don Lafreniere Jul 2019

Understanding Cumulative Hazards In A Rustbelt City: Integrating Gis, Archaeology, And Spatial History, Daniel Trepal, Don Lafreniere

Michigan Tech Publications, Part 1

We combine the Historical Spatial Data Infrastructure (HSDI) concept developed within spatial history with elements of archaeological predictive modeling to demonstrate a novel GIS-based landscape model for identifying the persistence of historically-generated industrial hazards in postindustrial cities. This historical big data approach draws on over a century of both historical and modern spatial big data to project the presence of specific persistent historical hazards across a city. This research improves on previous attempts to understand the origins and persistence of historical pollution hazards, and our final model augments traditional archaeological approaches to site prospection and analysis. This study also demonstrates …


A Hybrid Gis/In Situ Analysis Of Aed Coverage On The Unm Central Campus, Ian T. Hill Jul 2019

A Hybrid Gis/In Situ Analysis Of Aed Coverage On The Unm Central Campus, Ian T. Hill

Geography ETDs

Automated External Defibrillators (AED’s) are lifesaving devices that can greatly improve the survival rates of cardiac arrest when used quickly. There are publicly accessible AED’s on the UNM campus, and each device has an effective range based on how quickly a responder can retrieve the AED and return it to the site of the cardiac emergency. The ranges of the AED’s on UNM central campus are analyzed using GIS, interior building measurements, and various retrieval speeds. This helps evaluate the current placement of AED’s on campus and helps reveal where future coverage is needed. This focus on the combined navigation …


How Pennsylvanians Define Environmental Justice, Kayla Hofmann Jul 2019

How Pennsylvanians Define Environmental Justice, Kayla Hofmann

Sociology Summer Fellows

The Pennsylvania Department of Environmental Protection (DEP) defines an environmental justice area as any census tract that partially or wholly includes a 30 percent or greater minority population or 20 percent or more of a population living in poverty. However, little is known about how the average Pennsylvanian defines environmental justice, hindering our ability to determine whether the current definition is adequate. Using transcripts from nine listening sessions on the DEP’s tour of affected counties, I address 3 questions: (1) How do people define environmental justice? (2) What do people think are the most pressing issues in each county? And …


Age Of Concrete : Housing And The Shape Of Aspiration In The Capital Of Mozambique, David Morton Jul 2019

Age Of Concrete : Housing And The Shape Of Aspiration In The Capital Of Mozambique, David Morton

Ohio University Press Open Access Books

Age of Concrete is a history of the making of houses and homes in the subúrbios of Maputo (Lourenço Marques), Mozambique, from the late 1940s to the present. Often dismissed as undifferentiated, ahistorical “slums,” these neighborhoods are in fact an open-air archive that reveals some of people’s highest aspirations. At first people built in reeds. Then they built in wood and zinc panels. And finally, even when it was illegal, they risked building in concrete block, making permanent homes in a place where their presence was often excruciatingly precarious.

Unlike many histories of the built environment in African cities, Age …


Enhancing Ontario’S Rural Infrastructure Preparedness: Inter-Community Service Sharing In A Changing Climate — Rural Community Practitioners Workbook, Bryce Gunson, Brenda Murphy Jul 2019

Enhancing Ontario’S Rural Infrastructure Preparedness: Inter-Community Service Sharing In A Changing Climate — Rural Community Practitioners Workbook, Bryce Gunson, Brenda Murphy

Social and Environmental Justice Faculty Publications

This practitioner workbook draws together the insights from a three-year (2016-19) Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) funded research study. The purpose of the research project was to 1) assess the potential of inter-community service cooperation (ICSC) as a possible tool to address the impacts of climate change (CC) in small (500-7500 pop.) Ontario rural communities south of the Sudbury region and 2) understand the extent to which such collaboration and the impacts of CC are, or could be, embedded within the community’s infrastructure (asset) management processes (AMP). While the conclusions of this workbook are generalized to …


Enhancing Ontario’S Rural Infrastructure Preparedness: Inter-Community Service Sharing In A Changing Climate — Policy Brief, Brenda Murphy, Bryce Gunson Jul 2019

Enhancing Ontario’S Rural Infrastructure Preparedness: Inter-Community Service Sharing In A Changing Climate — Policy Brief, Brenda Murphy, Bryce Gunson

Social and Environmental Justice Faculty Publications

This policy brief draws together the insights from a three-year (2016-19) Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) funded research study. The purpose of the research project was to 1) assess the potential of inter-community service cooperation (ICSC) as a possible tool to address the impacts of climate change (CC) in small (500-7500 pop.) Ontario rural communities south of the Sudbury region and 2) understand the extent to which such collaboration and the impacts of CC are, or could be, embedded within the community’s infrastructure (asset) management processes (AMP). While the conclusions of policy brief are generalized to …


Rafi & Patra, Rafi, Patra, Tsos Jul 2019

Rafi & Patra, Rafi, Patra, Tsos

TSOS Interview Gallery

Rafi and his family have been stuck on the border between Greece and Macedonia for almost four months. They made their way from Afghanistan, received certificates in Greece to help them on their journey, but were then stopped at the border of Macedonia. The Macedonians said that they were no longer allowing Afghans into their country. Now all they can do is wait and hope. In Afghanistan,Rafi was a military man. As a young man, he was a part of the Revolution army, but later was made a soldier for the Government Security of Kabul. During that time, he was …


A Tourism Impact Index For Water-Based Natural Attractions Field-Tested In Subarctic And Maritime Climates, Jason Fox Jul 2019

A Tourism Impact Index For Water-Based Natural Attractions Field-Tested In Subarctic And Maritime Climates, Jason Fox

Masters Theses & Specialist Projects

Tourism in cold and cool-climate regions is largely characterized by recreational and sightseeing activities at water-based natural attractions such as beaches, coastal cliffs, and waterfalls. While the economic benefits of the tourism industry can contribute to a sustainable future for these regions, the environmental implications of a hastilydeveloped industry cannot be ignored given that cold-climate and cool-climate landscapes are at risk of rapid environmental change from a warming climate and other environmental concerns. This study consisted of the development of the Tourism Impact Index for Water-Based Natural Sites, the first of its kind, and its application and refinement in the …


Development Of A Karst Tourism Management Index To Assess Tourism-Driven Degradation Of Protected Karst Sites, Keith R. Semler Jul 2019

Development Of A Karst Tourism Management Index To Assess Tourism-Driven Degradation Of Protected Karst Sites, Keith R. Semler

Masters Theses & Specialist Projects

The intent of this research was to create and evaluate a karst tourism management index (KTMI). This index is intended to be a new management tool designed to quantify environmental disturbances caused specifically by tourism activities in karst regions, particularly show caves and springs. In an effort to assess the effectiveness of the index as a management tool in karst terrains, after development, the index was applied to six case study sites. A review of the management policies at each study site was conducted with the use of standard policy critique methods and semistructured interviews with managers at the study …


Enhancing Ontario’S Rural Infrastructure Preparedness: Inter-Community Service Sharing In A Changing Climate — Final Report: Swot Analysis And Key Insights, Brenda Murphy, Bryce Gunson Jul 2019

Enhancing Ontario’S Rural Infrastructure Preparedness: Inter-Community Service Sharing In A Changing Climate — Final Report: Swot Analysis And Key Insights, Brenda Murphy, Bryce Gunson

Social and Environmental Justice Faculty Publications

This final report draws together the insights from the three-year Ontario Ministry of Agriculture, Food and Rural Affairs (2016-2019) study. The quote above succinctly draws together the vision behind this project: Enhanced, efficient service cooperation that contributes to a sustainable and prepared infrastructure system, while protecting the environmental capital upon which rural economies frequently depend. The purpose of the research project was to 1) assess the potential of inter-community service cooperation (ICSC) as a possible tool to address the impacts of climate change (CC) in small (500-7500 pop.) Ontario rural communities south of the Sudbury region and 2) understand the …


Enhancing Ontario’S Rural Infrastructure Preparedness: Inter-Community Service Sharing In A Changing Climate — Interim Report 2: Provincial Survey Results, Brenda Murphy, Bryce Gunson Jul 2019

Enhancing Ontario’S Rural Infrastructure Preparedness: Inter-Community Service Sharing In A Changing Climate — Interim Report 2: Provincial Survey Results, Brenda Murphy, Bryce Gunson

Social and Environmental Justice Faculty Publications

Rural communities draw from their history of doing more with less, strong social networks and an intimate relationship with the natural environment to achieve economic innovation, positive social capacity development and environmental sustainability. These spaces also experience challenges including preparing for the impacts of climate change (CC). Ontario has already felt some of these effects leading to millions of dollars of damage to the province’s infrastructure. Exacerbated by an aging infrastructure built by now outdated assumptions, the vulnerability to CC will likely increase and the built-in coping range may not be adequate to handle future climate extremes.

The purpose of …


Taller Del Grupo Geográfico Transfronterizo De La Amazonía Sud-Occidental (Gtaso) Para Mitigar Desafios Ambientales En La Amazonía Peruana Y Brasileña, Claire Powell, David S. Salisbury, Balbín Ordaya, Bertha O., Pedro Tipula Tipula Jul 2019

Taller Del Grupo Geográfico Transfronterizo De La Amazonía Sud-Occidental (Gtaso) Para Mitigar Desafios Ambientales En La Amazonía Peruana Y Brasileña, Claire Powell, David S. Salisbury, Balbín Ordaya, Bertha O., Pedro Tipula Tipula

Geography and the Environment Faculty Publications

Contexto:

El territorio fronterizo compartido por las regiones Ucayali (Perú), Madre de Dios (Perú) y Acre (Brasil) es un espacio geográfico de alta sensibilidad física, social, económica y ambiental dada sus características de localización geográfica: clima tropical, escasa accesibilidad, abundantes recursos naturales, alta diversidad biocultural y aislamiento en relación a los respectivos gobiernos centrales. Este territorio fronterizo incluye zonas, tales como la frontera Acre-Ucayali y Acre-Madre de Dios, ocupadas mayoritariamente por diversas poblaciones indígenas. Estas regiones han visto en los últimos años un incremento en actividades de extracción de recursos y proyectos de infraestructura. Dichas actividades incluyen explotación de madera, …


Governance In A Globalised World, Richard Woodward Jul 2019

Governance In A Globalised World, Richard Woodward

Books/Book Chapters

Discussions surrounding the sources of power and authority that govern the social world have taken place since ancient times. Finally, in the latter half of the twentieth century, it appeared that this debate had been decisively resolved in favour of the view that governance was the preserve of governments. This was a consequence of the ascendance in the social sciences of methodologies that presupposed human activities to correspond to the territorial boundaries of sovereign states. The privileging of sovereign territoriality did not reflect a poverty of scholarly thinking but was a by-product of their social world. (Taylor, 1996). By the …


Searching Activity Trajectories With Semantics, Li-Hua Yin, Huiwen Liu Jul 2019

Searching Activity Trajectories With Semantics, Li-Hua Yin, Huiwen Liu

PhD Student’s Publications Collection

With the widespread use of smart phones and mobile Internet, social network users have generated massive geo-tagged tweets, photos and videos to form lots of informative trajectories which reveal not only their spatio-temporal dynamics, but also their activities in the physical world. Existing spatial trajectory query studies mainly focus on analyzing the spatio-temporal properties of the users’ trajectories, while leaving the understanding of their activities largely untouched. In this paper, we incorporate the semantics of the activity information embedded in trajectories into query modelling and processing, with the aim of providing end users more informative and meaningful results. To this …