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Articles 271 - 300 of 384
Full-Text Articles in Geography
Does Terrestrial Drought Explain Global Co 2 Flux Anomalies Induced By El Niño?, C. R. Schwalm, Christopher A. Williams, K. Schaefer, I. Baker, G. J. Collatz, C. Rödenbeck
Does Terrestrial Drought Explain Global Co 2 Flux Anomalies Induced By El Niño?, C. R. Schwalm, Christopher A. Williams, K. Schaefer, I. Baker, G. J. Collatz, C. Rödenbeck
Geography
The El Niño Southern Oscillation is the dominant year-to-year mode of global climate variability. El Niño effects on terrestrial carbon cycling are mediated by associated climate anomalies, primarily drought, influencing fire emissions and biotic net ecosystem exchange (NEE). Here we evaluate whether El Niño produces a consistent response from the global carbon cycle. We apply a novel bottom-up approach to estimating global NEE anomalies based on FLUXNET data using land cover maps and weather reanalysis. We analyze 13 years (1997-2009) of globally gridded observational NEE anomalies derived from eddy covariance flux data, remotely-sensed fire emissions at the monthly time step, …
Spatial And Interannual Variability Of Dissolved Organic Matter In The Kolyma River, East Siberia, Observed Using Satellite Imagery, Claire G. Griffin, Karen E. Frey, John Rogan, Robert M. Holmes
Spatial And Interannual Variability Of Dissolved Organic Matter In The Kolyma River, East Siberia, Observed Using Satellite Imagery, Claire G. Griffin, Karen E. Frey, John Rogan, Robert M. Holmes
Geography
The Kolyma River basin in northeastern Siberia, the sixth largest river basin draining to the Arctic Ocean, contains vast reserves of carbon in Pleistocene-aged permafrost soils. Permafrost degradation, as a result of climate change, may cause shifts in riverine biogeochemistry as this old source of organic matter is exposed. Satellite remote sensing offers an opportunity to complement and extrapolate field sampling of dissolved organic matter in this expansive and remote region. We develop empirically based algorithms that estimate chromophoric dissolved organic matter (CDOM) and dissolved organic carbon (DOC) in the Kolyma River and its major tributaries in the vicinity of …
Death To Kappa: Birth Of Quantity Disagreement And Allocation Disagreement For Accuracy Assessment, Robert Gilmore Pontius, Marco Millones
Death To Kappa: Birth Of Quantity Disagreement And Allocation Disagreement For Accuracy Assessment, Robert Gilmore Pontius, Marco Millones
Geography
The family of Kappa indices of agreement claim to compare a map's observed classification accuracy relative to the expected accuracy of baseline maps that can have two types of randomness: (1) random distribution of the quantity of each category and (2) random spatial allocation of the categories. Use of the Kappa indices has become part of the culture in remote sensing and other fields. This article exam- ines five different Kappa indices, some of which were derived by the first author in 2000. We expose the indices' properties mathematically and illustrate their limitations graphically, with emphasis on Kappa's use of …
Market Intermediaries And Rural People In Bolivia's Forest Products Sector: Are Trusting Partnerships Possible?, James T. Murphy, Mary Lawhon
Market Intermediaries And Rural People In Bolivia's Forest Products Sector: Are Trusting Partnerships Possible?, James T. Murphy, Mary Lawhon
Geography
Decentralization in access to and control of Bolivia's forest resources, coupled with a rising global demand for tropical hardwoods, raises important questions about whether increased trade and community forest management (CFM) initiatives can enable forms of market integration that have more favourable outcomes for rural communities. This paper assesses the prospects for such a transition through an examination of the relationships linking wood product market intermediaries (brokers and buyers) to rural suppliers and forest communities in Bolivia. The analysis centres on whether trust - conceptualized as a power-laden sociospatial process driven by multiscalar factors - can evolve between buyers and …
Climate Change: Helping Nature Survive The Human Response, Will R. Turner, Bethany A. Bradley, Lyndon D. Estes, David G. Hole, Michael Oppenheimer, David S. Wilcove
Climate Change: Helping Nature Survive The Human Response, Will R. Turner, Bethany A. Bradley, Lyndon D. Estes, David G. Hole, Michael Oppenheimer, David S. Wilcove
Geography
Climate change poses profound, direct, and well-documented threats to biodiversity. A significant fraction of Earth's species is at risk of extinction due to changing precipitation and temperature regimes, rising and acidifying oceans, and other factors. There is also growing awareness of the diversity and magnitude of responses, both proactive and reactive, that people will undertake as lives and livelihoods are affected by climate change. Yet to date few studies have examined the relationship between these two powerful forces. The natural systems upon which people depend, already under direct assault from climate change, are further threatened by how we respond to …
Climate Control Of Terrestrial Carbon Exchange Across Biomes And Continents, Chuixiang Yi, Runze Li, John Wolbeck, Xiyan Xu, Mats Nilsson, Luis Aires, John D. Albertson, Christof Ammann, M. Altaf Arain, Alessandro C. De Araujo, Marc Aubinet, Mika Aurela, Zoltán Barcza, Alan Barr, Paul Berbigier, Jason Beringer, Christian Bernhofer, Andrew T. Black, Paul V. Bolstad, Fred C. Bosveld, Mark S.J. Broadmeadow, Nina Buchmann, Sean P. Burns, Pierre Cellier, Jingming Chen, Jiquan Chen, Philippe Ciais, Robert Clement, Bruce D. Cook, Peter S. Curtis, D. Bryan Dail, Ebba Dellwik, Christopher A. Williams
Climate Control Of Terrestrial Carbon Exchange Across Biomes And Continents, Chuixiang Yi, Runze Li, John Wolbeck, Xiyan Xu, Mats Nilsson, Luis Aires, John D. Albertson, Christof Ammann, M. Altaf Arain, Alessandro C. De Araujo, Marc Aubinet, Mika Aurela, Zoltán Barcza, Alan Barr, Paul Berbigier, Jason Beringer, Christian Bernhofer, Andrew T. Black, Paul V. Bolstad, Fred C. Bosveld, Mark S.J. Broadmeadow, Nina Buchmann, Sean P. Burns, Pierre Cellier, Jingming Chen, Jiquan Chen, Philippe Ciais, Robert Clement, Bruce D. Cook, Peter S. Curtis, D. Bryan Dail, Ebba Dellwik, Christopher A. Williams
Geography
Understanding the relationships between climate and carbon exchange by terrestrial ecosystems is critical to predict future levels of atmospheric carbon dioxide because of the potential accelerating effects of positive climate-carbon cycle feedbacks. However, directly observed relationships between climate and terrestrial CO2exchange with the atmosphere across biomes and continents are lacking. Here we present data describing the relationships between net ecosystem exchange of carbon (NEE) and climate factors as measured using the eddy covariance method at 125 unique sites in various ecosystems over six continents with a total of 559 site-years. We find that NEE observed at eddy covariance sites is …
Complexity In Water And Carbon Dioxide Fluxes Following Rain Pulses In An African Savanna, Christopher A. Williams, Niall Hanan, Robert J. Scholes, Werner Kutsch
Complexity In Water And Carbon Dioxide Fluxes Following Rain Pulses In An African Savanna, Christopher A. Williams, Niall Hanan, Robert J. Scholes, Werner Kutsch
Geography
The idea that many processes in arid and semi-arid ecosystems are dormant until activated by a pulse of rainfall, and then decay from a maximum rate as the soil dries, is widely used as a conceptual and mathematical model, but has rarely been evaluated with data. This paper examines soil water, evapotranspiration (ET), and net ecosystem CO2 exchange measured for 5 years at an eddy covariance tower sited in an Acacia-Combretum savanna near Skukuza in the Kruger National Park, South Africa. The analysis characterizes ecosystem flux responses to discrete rain events and evaluates the skill of increasingly complex "pulse models". …
Drivers Of Inter-Annual Variability In Net Ecosystem Exchange In A Semi-Arid Savanna Ecosystem, South Africa, S. A. Archibald, A. Kirton, M. R. Van Der Merwe, R. J. Scholes, Christopher A. Williams, N. Hanan
Drivers Of Inter-Annual Variability In Net Ecosystem Exchange In A Semi-Arid Savanna Ecosystem, South Africa, S. A. Archibald, A. Kirton, M. R. Van Der Merwe, R. J. Scholes, Christopher A. Williams, N. Hanan
Geography
Inter-annual variability in primary production and ecosystem respiration was explored using eddy-covariance data at a semi-arid savanna site in the Kruger Park, South Africa. New methods of extrapolating night-time respiration to the entire day and filling gaps in eddy-covariance data in semi-arid systems were developed. Net ecosystem exchange (NEE) in these systems occurs as pulses associated with rainfall events, a pattern not well-represented in current standard gap-filling procedures developed primarily for temperate flux sites. They furthermore do not take into account the decrease in respiration at high soil temperatures. An artificial neural network (ANN) model incorporating these features predicted measured …
Latin America: Contesting Extraction, Producing Geographies, Anthony J. Bebbington
Latin America: Contesting Extraction, Producing Geographies, Anthony J. Bebbington
Geography
Characterizing continents is the business of fools, inviting the charge of essentialization, over-generalization, and caricature of nuanced and complex processes varying across space and over time. Likewise it can attract the criticism that to privilege the national or the regional understates the transnational dimensions of social change, and to take a territorialized view diverts attention from the networks that cut across space, linking distant actors and places. This short essay therefore claims neither to be a reflection on Latin America-wide phenomena, and far less a statement on the most significant aspects of the political economy of the region. It does, …
"Please Mr Bebbington, Don't Come Here And Tell Us What To Do", Anthony J. Bebbington
"Please Mr Bebbington, Don't Come Here And Tell Us What To Do", Anthony J. Bebbington
Geography
The work in question addresses the relationships between mining, local development and democracy, and the thus-far most contentious part of this research has focused on a region affected by a mining project executed by a UK based "resource development" company. This specific part of the research has been conducted in conjunction with a UK based solidarity organization, the Peru Support Group as well as with Oxfam UK's office in Perú. The criticism of meddling came from the director in Peru of the Chinese consortium that in early 2007 acquired majority ownership of the mining company – the title paraphrases his …
The World Development Report 2009 'Reshapes Economic Geography': Geographical Reflections, Jonathan Rigg, Anthony J. Bebbington, Katherine V. Gough, Deborah F. Bryceson, Jytte Agergaard, Niels Fold, Cecilia Tacoli
The World Development Report 2009 'Reshapes Economic Geography': Geographical Reflections, Jonathan Rigg, Anthony J. Bebbington, Katherine V. Gough, Deborah F. Bryceson, Jytte Agergaard, Niels Fold, Cecilia Tacoli
Geography
The Report focuses on the spatial transformations that must happen for countries to develop. Cities, migration and trade, it is claimed, have been the main catalysts of progress and hence ‗Growing cities, ever more mobile people, and increasingly specialised products are … essential for economic success‘ (World Bank 2009, xx). These greater densities, shorter distances and reduced divisions will, the Report argues, bring about unbalanced growth: however, over time, other policies and mechanisms for integration will foster convergence in living standards. Development, seen through the Report‘s eyes, involves a necessary (and welcome) spatial unevenness in economic activity coupled with progressive …
Contesting Environmental Transformation: Political Ecologies And Environmentalisms In Latin America And The Caribbean, Anthony J. Bebbington
Contesting Environmental Transformation: Political Ecologies And Environmentalisms In Latin America And The Caribbean, Anthony J. Bebbington
Geography
The available download on this page is the author manuscript accepted for publication. This version has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process.
Interannual Variability Of Photosynthesis Across Africa And Its Attribution, Christopher A. Williams, Niall P. Hanan, Ian Baker, G. James Collatz, Joseph Berry, A. Scott Denning
Interannual Variability Of Photosynthesis Across Africa And Its Attribution, Christopher A. Williams, Niall P. Hanan, Ian Baker, G. James Collatz, Joseph Berry, A. Scott Denning
Geography
Africa is thought to be a large source of interannual variability in the global carbon cycle, only vaguely attributed to climate fluctuations. This study uses a biophysical model, Simple Biosphere, to examine in detail what specific factors, physiological (acute stress from low soil water, temperature, or low humidity) and biophysical (low vegetation radiation use), are responsible for spatiotemporal patterns of photosynthesis across the African continent during the period 1982-2003. Acute soil water stress emerges as the primary factor driving interannual variability of photosynthesis for most of Africa. Southern savannas and woodlands are a particular hot spot of interannual variability in …
Contention And Ambiguity: Mining And The Possibilities Of Development, Anthony J. Bebbington, Leonith Hinojosa, Denise Bebbington, Maria Luisa Burneo, Ximena Warnaars
Contention And Ambiguity: Mining And The Possibilities Of Development, Anthony J. Bebbington, Leonith Hinojosa, Denise Bebbington, Maria Luisa Burneo, Ximena Warnaars
Geography
The last decade and a half has witnessed a dramatic growth in mining activity in many developing countries. This article reviews these recent trends and describes the debates and conflicts they have triggered. The authors review evidence regarding debates on the resource curse and the possibility of an extraction-led pathway to development. They then describe the different types of resistance and social mobilization that have greeted mineral expansion at a range of geographical scales, and consider how far these protests have changed the relationships between mining and political economic change. The conclusions address how far such protests might contribute to …
Social Movements And The Dynamics Of Rural Territorial Development In Latin America, Anthony J. Bebbington, Ricardo Abramovay, Manuel Chiriboga
Social Movements And The Dynamics Of Rural Territorial Development In Latin America, Anthony J. Bebbington, Ricardo Abramovay, Manuel Chiriboga
Geography
This special section brings together 4 of the 12 studies conducted within a research program analyzing the relationships among social mobilization, governance, and rural development in contemporary Latin America. The introduction gives an overview of the contemporary significance of social movements for rural development dynamics in the region, and of the principal insights of the section papers and the broader research program of which they were a part. This significance varies as an effect of two distinct and uneven geographies: the geography of social movements themselves and the geography of the rural political economy. The effects that movements have on …
Water And Mining Conflicts In Peru, Anthony J. Bebbington, Mark Williams
Water And Mining Conflicts In Peru, Anthony J. Bebbington, Mark Williams
Geography
Impacts on water quality and quantity are among the most contentious aspects of mining projects. Companies insist that the use of modern technologies will ensure environmentally friendly mining practices. However, evidence of the negative environmental impacts of past mining activity causes local and downstream populations to worry that new mining activities will adversely affect their water supply. We report on one mine site in Peru where water has become a: particularly conflictive issue. We then provide a detailed proposal for a monitoring plan to recover trust among stakeholders. A welldesigned and executed monitoring plan for water quantity and quality is …
Components Of Information For Multiple Resolution Comparison Between Maps That Share A Real Variable, Robert Gilmore Pontius, Olufunmilayo Thontteh, Hao Chen
Components Of Information For Multiple Resolution Comparison Between Maps That Share A Real Variable, Robert Gilmore Pontius, Olufunmilayo Thontteh, Hao Chen
Geography
This paper presents quantitative methods that allow scientists to compare the patterns in two maps that show a shared real variable. Specifically, this paper shows how to budget various components of agreement and disagreement between maps. The components are based on the separation of a map's information of quantity from its information of location. The technique also examines how variation in resolution influences the measurement of the components of information. The manner in which the measurements change as a function of spatial resolution can be more important and interesting than the results at any single particular resolution, because the results …
Abundance Of Immature Anopheles And Culicines (Diptera: Culicidae) In Different Water Body Types In The Urban Environment Of Malindi, Kenya, Daniel E. Impoinvil, Joseph Keating, Charles M. Mbogo, Matthew D. Potts, Rinku Roy Chowdhury, John C. Beier
Abundance Of Immature Anopheles And Culicines (Diptera: Culicidae) In Different Water Body Types In The Urban Environment Of Malindi, Kenya, Daniel E. Impoinvil, Joseph Keating, Charles M. Mbogo, Matthew D. Potts, Rinku Roy Chowdhury, John C. Beier
Geography
In this study we 1) describe the abundance of Anopheles and culicine immatures in different water body types in urban Malindi, Kenya, 2) compare Anopheles immature density in relation to culicine immature density, and 3) identify characteristics that influence the likelihood of water bodies being co-colonized by Anopheles and culicines. Entomological and environmental cross-sectional surveys conducted in 2001 and 2002 were used in the analysis. A total of 889 Anopheles and 7,217 culicine immatures were found in diverse water body types in 2001 and 2002. Car-track pools (n=45) and unused swimming pools (n=25) comprised 61% (70 of 115) of all …
Habitat Selection By A Rare Forest Antelope: A Multi-Scale Approach Combining Field Data And Imagery From Three Sensors, Lyndon Estes, G. S. Okin, A. G. Mwangi, H. H. Shugart
Habitat Selection By A Rare Forest Antelope: A Multi-Scale Approach Combining Field Data And Imagery From Three Sensors, Lyndon Estes, G. S. Okin, A. G. Mwangi, H. H. Shugart
Geography
It can be difficult to further scientific understanding of rare or endangered species that live in inaccessible habitat using traditional methods, such as probabilistic modeling based on field data collection. Remote sensing (RS) can be an important source of information for the study of these animals. A key advantage of RS is its ability to provide information over an animal's complete range, but models incorporating RS data are limited by RS's ability to detect important habitat features. In this study, we focus on the rare, poorly-understood mountain bongo antelope (Tragelaphus euryceros isaaci) which survives in the wild in isolated pockets …
Mapping Selective Logging In Mixed Deciduous Forest: A Comparison Of Machine Learning Algorithms, Christopher D. Lippitt, John Rogan, Zhe Li, J. Ronald Eastman, Trevor G. Jones
Mapping Selective Logging In Mixed Deciduous Forest: A Comparison Of Machine Learning Algorithms, Christopher D. Lippitt, John Rogan, Zhe Li, J. Ronald Eastman, Trevor G. Jones
Geography
This study assesses the performance of five Machine Learning Algorithms (MLAS) in a chronically modified mixed deciduous forest in Massachusetts (USA) in terms of their ability to detect selective timber logging and to cope with deficient reference datasets. Multitemporal Landsat Enhanced Thematic Mapper-plus (ETM+) imagery is used to assess the performance of three Anificial Neural Networks - Multi-Layer Perceptron, ARTMAP, Self-Organizing Map, and two Classification Tree splitting algorithms: gini and entropy rules, MLA performance evaluations are based on susceptibility to reduced training set size, noise, and variations in the training set, as well as the operability/transparency of the classification process. …
Response Of Carbon Fluxes To Water Relations In A Savanna Ecosystem In South Africa, W. L. Kutsch, N. Hanan, B. Scholes, I. Mchugh, W. Kubheka, H. Eckhardt, Christopher A. Williams
Response Of Carbon Fluxes To Water Relations In A Savanna Ecosystem In South Africa, W. L. Kutsch, N. Hanan, B. Scholes, I. Mchugh, W. Kubheka, H. Eckhardt, Christopher A. Williams
Geography
The principal mechanisms that connect carbon fluxes with water relations in savanna ecosystems were studied by using eddy covariance method in a savanna ecosystem at Kruger National Park, South Africa. Since the annual drought and rewetting cycle is a major factor influencing the function of savanna ecosystems, this work focused on the close inter-connection between water relations and carbon fluxes. Data from a nine-month measuring campaign lasting from the early wet season to the late dry season were used.
Total ecosystem respiration showed highest values at the onset of the growing season, a slightly lower plateau during the main part …
Impacts Of Climate Warming And Permafrost Thaw On The Riverine Transport Of Nitrogen And Phosphorus To The Kara Sea, Karen E. Frey, James W. Mcclelland, Robert M. Holmes, Laurence G. Smith
Impacts Of Climate Warming And Permafrost Thaw On The Riverine Transport Of Nitrogen And Phosphorus To The Kara Sea, Karen E. Frey, James W. Mcclelland, Robert M. Holmes, Laurence G. Smith
Geography
Measurements of nitrogen and phosphorus (N and P) concentrations from previously unstudied streams and rivers throughout west Siberia suggest that climate warming and/or associated permafrost thaw will likely amplify the transport of N and P to the Kara Sea and adjacent Arctic Ocean. We present concentrations of dissolved organic nitrogen (DON), ammonium (NH4-N), nitrate (NO3-N), total dissolved nitrogen (TDN), and total dissolved phosphorus (TDP) from 96 streams and rivers within the Ob'-Iriysh, Nadym, and Pur river drainage basins. The sampled sites span ∼106 km2, a large climatic gradient (∼55°N-68°N), and include 41 cold, permafrost-influenced and 55 warm, permafrost-free watersheds. Concentrations …
Bureacratizing Ethics: Institutional Review Boards And Participatory Research, Deborah Martin
Bureacratizing Ethics: Institutional Review Boards And Participatory Research, Deborah Martin
Geography
This paper provides a brief history of regulatory research ethics, as embodied in Institutional Review Boards in the United States. The purpose is to foster common disciplinary understanding of the origin and purpose of IRBs, and to identify the core conflict between the philosophies of participatory action research and regulatory ethics. That conflict centers on the contradictory language and associated understandings of research "subjects" and "participants". I suggest a need for more disciplinary engagements around this conflict, to foster more open ethical debates and competencies among geographers. © Deborah G. Martin, 2007; journal compilation © ACME Editorial Collective, 2007.
Household Land Management And Biodiversity: Secondary Succession In A Forest-Agriculture Mosaic In Southern Mexico, Rinku Roy Chowdhury
Household Land Management And Biodiversity: Secondary Succession In A Forest-Agriculture Mosaic In Southern Mexico, Rinku Roy Chowdhury
Geography
This study evaluates anthropogenic and ecological dimensions of secondary forest succession in Mexico's southern Yucatán peninsular region, a hotspot of biodiversity and tropical deforestation. Secondary succession in particular constitutes an ecologically and economically important process, driven by and strongly influencing land management and local ecosystem structures and dynamics. As agents of local land management, smallholding farmers in communal, i.e., ejido lands affect rates of forest change, biodiversity, and sustainability within and beyond their land parcels. This research uses household survey's and land parcel mapping in two ejidos located along the buffer of the Calakmul Biosphere Reserve to analyze how household …
The Association Between Distance To Water Pipes And Water Bodies Positive For Anopheline Mosquitoes (Diptera: Culicidae) In The Urban Community Of Malindi, Kenya, Daniel E. Impoinvil, Joseph Keating, Rinku Roy Chowdhury, Robert Duncan, Gabriel Cardenas, Sajjad Ahmad, Charles M. Mbogo, John I. Githure, John C. Beier
The Association Between Distance To Water Pipes And Water Bodies Positive For Anopheline Mosquitoes (Diptera: Culicidae) In The Urban Community Of Malindi, Kenya, Daniel E. Impoinvil, Joseph Keating, Rinku Roy Chowdhury, Robert Duncan, Gabriel Cardenas, Sajjad Ahmad, Charles M. Mbogo, John I. Githure, John C. Beier
Geography
The increasing risk of mosquito-borne diseases in African urban environments has been partly attributed to failed planning and resource underdevelopment. Though engineered systems may reduce mosquito proliferation, there are few studies describing this relationship. This study investigates how engineered systems such as roads and piped water systems affect the odds of anopheline immatures (i.e., larvae and pupae) occurring in water bodies located in Malindi, Kenya. Anopheles gambiae s.s. (Giles), An. arabiensis (Patton), and An. merus (Dointz) were identified in urban Malindi, with Anopheles gambiae s.s. being the predominant species identified. The Breslow-Day test was used to explore interactions among independent …
Africa And The Global Carbon Cycle, Christopher A. Williams, Niall P. Hanan, Jason C. Neff, Robert J. Scholes, Joseph A. Berry, A. Scott Denning, David F. Baker
Africa And The Global Carbon Cycle, Christopher A. Williams, Niall P. Hanan, Jason C. Neff, Robert J. Scholes, Joseph A. Berry, A. Scott Denning, David F. Baker
Geography
The African continent has a large and growing role in the global carbon cycle, with potentially important climate change implications. However, the sparse observation network in and around the African continent means that Africa is one of the weakest links in our understanding of the global carbon cycle. Here, we combine data from regional and global inventories as well as forward and inverse model analyses to appraise what is known about Africa's continental-scale carbon dynamics. With low fossil emissions and productivity that largely compensates respiration, land conversion is Africa's primary net carbon release, much of it through burning of forests. …
Expanding The Conceptual, Mathematical And Practical Methods For Map Comparison, Gilmore Robert Pontius, John Connors
Expanding The Conceptual, Mathematical And Practical Methods For Map Comparison, Gilmore Robert Pontius, John Connors
Geography
Conventional methods of map comparison frequently produce unhelpful results for a variety of reasons. In particular, conventional methods usually analyze pixels at a single default scale and frequently insist that each pixel belongs to exactly one category. The purpose of this paper is to offer improved methods so that scientists can obtain more helpful results by performing multiple resolution analysis on pixels that belong simultaneously to several categories. This paper examines the fundamentals of map comparison beginning from the elementary comparison between two pixels that have partial membership to multiple categories. We examine the conceptual foundation of three methods to …
Statistical Methods To Partition Effects Of Quantity And Location During Comparison Of Categorical Maps At Multiple Resolutions, R. Gil Pontius
Statistical Methods To Partition Effects Of Quantity And Location During Comparison Of Categorical Maps At Multiple Resolutions, R. Gil Pontius
Geography
New generalized statistical methods to measure agreement between two maps at multiple-resolutions, where each cell in each map has a multinomial distribution among any number of categories, are presented. This methodology quantifies agreement between any two categorical maps, where either map uses fuzzy or crisp classification. The method measures the agreement at various resolutions by aggregating neighboring cells into an increasingly coarse grid. At each resolution, the method partitions the overall agreement into correct due to chance, correct due to quantity, correct due to location, error due to location, and error due to quantity. In addition, the method computes six …
The Monadnock Volume 54-55, 1980-1981, Clark University Geographical Society
The Monadnock Volume 54-55, 1980-1981, Clark University Geographical Society
The Monadnock (Clark Geographical Society)
Volume 54-55 The Monadnock. The Monadnock was the alumni magazine of the Clark University Geographical Society (1927-1985) (2014-present).
The Monadnock Volume 52-53, 1978-1979, Clark University Geographical Society
The Monadnock Volume 52-53, 1978-1979, Clark University Geographical Society
The Monadnock (Clark Geographical Society)
Volume 52-53 of The Monadnock. The Monadnock was the alumni magazine of the Clark University Geographical Society (1927-1985) (2014-present).