Open Access. Powered by Scholars. Published by Universities.®

Geography Commons™

Open Access. Powered by Scholars. Published by Universities.®

Discipline
Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 9421 - 9450 of 12387

Full-Text Articles in Geography

Some Taxonomic Records Of Aquatic Insects In The Eroo River Basin (West Khentii, Northern Mongolia), Purevdorj Surenkhorloo, Ravchig Samiya, Jolanta Slowik, Michael Mühlenberg Jan 2012

Some Taxonomic Records Of Aquatic Insects In The Eroo River Basin (West Khentii, Northern Mongolia), Purevdorj Surenkhorloo, Ravchig Samiya, Jolanta Slowik, Michael Mühlenberg

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

In the Eroo basin of Mongolia, many species of aquatic insects have been recorded including five species of Diptera in the families Psychodidae, Dixidae, and Blephaceridae and 25 species across eight families of stoneflies. One species of Psychodidae, Bazarella baikalensis Wagner is reported for the first time in Mongolia while the other families are discussed and a species list is provided for the country.


First Stable Isotope Analysis Of Asiatic Wild Ass Tail Hair From The Mongolian Gobi, Micha Horacek, Petra Kaczensky, Merina Burnik Sturm Jan 2012

First Stable Isotope Analysis Of Asiatic Wild Ass Tail Hair From The Mongolian Gobi, Micha Horacek, Petra Kaczensky, Merina Burnik Sturm

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

Stable isotope analysis has become a powerful tool to study feeding ecology, water use or movement pattern in contemporary, historic and ancient species. Certain hair and teeth grow continuously, and when sampled longitudinally can provide temporally explicit information on dietary regime and movement pattern. In an initial trial, we analysed a tail sample of an Asiatic wild ass (Equus hemionus) from the Mongolian Gobi. We found seasonal variations in H, C, and N isotope patterns, likely being the result of temporal variations in available feeds, water supply and possibly physiological status. Thus stable isotope analysis shows promise to …


Structure And Productivity Of Haloxylon Ammodendron Communities In The Mongolian Gobi, Tamara I. Kazantseva, Nikolay N. Slemnev, Pjotr D. Gunin, Sh. Tsooj Jan 2012

Structure And Productivity Of Haloxylon Ammodendron Communities In The Mongolian Gobi, Tamara I. Kazantseva, Nikolay N. Slemnev, Pjotr D. Gunin, Sh. Tsooj

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

Communities of Haloxylon ammodendron are widespread in the Mongolian Gobi where they play a significant role in biodiversity preservation. They occupy several main types of habitats, showing differences in density, projective cover, and productivity. Haloxylon ammodendron plays a similar, if not even more important role in the arid zone of Mongolia as the principal forest-making trees in the Northern part of the country. The complex set of quantitative parameters of Haloxylon ammodendron stands studied here in respect to temporal dynamics can serve as an indicator of both the vitality of desert ecosystems, and of environmental change.


Erforschung Biologischer Ressourcen Der Mongolei, Band 12 = Exploration Into The Biological Resources Of Mongolia, Volume 12: Front Matter And Table Of Contents, Annegret Stubbe Jan 2012

Erforschung Biologischer Ressourcen Der Mongolei, Band 12 = Exploration Into The Biological Resources Of Mongolia, Volume 12: Front Matter And Table Of Contents, Annegret Stubbe

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

The title page, front matter, and table of contents for volume 12 of the Erforschung journal (i.e. the Black journal) of the Martin-Luther-Universität Halle Wittenberg, Halle (Saale).


Coccidia (Apicomplexa: Eimeriidae) From Vespertilio Murinus And Eptesicus Gobiensis (Chiroptera: Vespertilionidae) In Mongolia And How Many Species Of Coccidia Occur In Bats?, David S. Tinnin, Ethan T. Jensen, Nyamsuren Batsaikhan, Scott Lyell Gardner Jan 2012

Coccidia (Apicomplexa: Eimeriidae) From Vespertilio Murinus And Eptesicus Gobiensis (Chiroptera: Vespertilionidae) In Mongolia And How Many Species Of Coccidia Occur In Bats?, David S. Tinnin, Ethan T. Jensen, Nyamsuren Batsaikhan, Scott Lyell Gardner

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

An examination of the feces from 28 bats collected in 1999 and from 12 bats collected in 2009, all from Mongolia, revealed the presence of two new species of coccidian parasites of the genus Eimeria. Bats representing two species assigned to different genera were studied including: Vespertillio murinus and Eptesicus gobiensis. Oocysts of Eimeria stubbei n. sp. from V. murinus collected in 1999 are ellipsoid, average length and width of 22.4 x 18.7 μm, with a 1.5 μm thick double layered wall and a single polar granule. Sporocysts of this species are ovoid, 10.0 x 7.2 μm in …


Ectoparasites Of Bats In Mongolia, Part 2 (Ischnopsyllidae, Nycteribiidae, Cimicidae And Acari), Ingo Scheffler, Dietrich Dolch, Jargalsaikhan Ariunbold, Annegret Stubbe, Andreas Abraham, Klaus Thiele Jan 2012

Ectoparasites Of Bats In Mongolia, Part 2 (Ischnopsyllidae, Nycteribiidae, Cimicidae And Acari), Ingo Scheffler, Dietrich Dolch, Jargalsaikhan Ariunbold, Annegret Stubbe, Andreas Abraham, Klaus Thiele

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

This study analyses ectoparasites found on Mongolian bats between 2008 and 2011. We examined 12 different bat species, with a total of 23 ectoparasite species present. Apart from reporting distributions, we also discuss specific host-parasite relationships. Owing to recent taxonomic changes splitting the Myotis mystacinus-group into several new taxa, their corresponding ectoparasite fauna could also be addressed in detail. Introducing ectoparasitic insects at length elsewhere (Scheffler et al. 2010), this paper focuses on the analysis of parasitic Acari. Additional findings for Spinturnicidae (wing mites) and Macronyssidae broadened the spectrum of known parasites. Altogether, the knowledge of bat ectoparasites from Mongolia …


Siphonaptera Of Mongolia And Tuva: Results Of The Mongolian- German Biological Expeditions Since 1962 – Years 1999-2003, Daniel Kiefer, Michael Stubbe, Annegret Stubbe, Scott Lyell Gardner, D. Tserenorov, R. Samiya, D. Otgonbaatar, D. Sumiya, Matthias S. Kiefer Jan 2012

Siphonaptera Of Mongolia And Tuva: Results Of The Mongolian- German Biological Expeditions Since 1962 – Years 1999-2003, Daniel Kiefer, Michael Stubbe, Annegret Stubbe, Scott Lyell Gardner, D. Tserenorov, R. Samiya, D. Otgonbaatar, D. Sumiya, Matthias S. Kiefer

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

This report provides an overview of flea species and the corresponding hosts in Mongolia and Tuva during 1999-2003. The taxonomical development of this vector group of great medical importance covers more than a century of flea research in Mongolia, resulting in the current number of 162 species known from this area.


Kinect And 3d Gis In Archaeology, Heather Richards-Rissetto, Fabio Remondino, Jim Robersson, Jennifer Von Schwerin, Giorgio Agugiaro, Gabrio Girardi Jan 2012

Kinect And 3d Gis In Archaeology, Heather Richards-Rissetto, Fabio Remondino, Jim Robersson, Jennifer Von Schwerin, Giorgio Agugiaro, Gabrio Girardi

Department of Anthropology: Faculty Publications

This paper explores the potential of using Microsoft's Kinect to create a low-cost and portable system to virtually navigate, through a prototype 3D GIS, the digitally reconstructed ancient Maya city and UNESCO World Heritage Site of Copan in Honduras. The 3D GIS, named QueryArch3D, was developed as part of the MayaArch3D project (http://mayaarch3d.unm.edu), which explores the possibilities of integrating databases and 3D digital tools for research and teaching on ancient architectures and landscapes. The developed system, based on the Flexible Action and Articulated Skeleton Toolkit (FAAST), controls in a remote and touchless mode the movements in the 3D environment in …


Constraints On The Structure Of The Border Ranges Fault System, South-Central Alaska From Integrated 3d Inversion Of Gravity/Magnetic Data, Niti Mankhemthong Jan 2012

Constraints On The Structure Of The Border Ranges Fault System, South-Central Alaska From Integrated 3d Inversion Of Gravity/Magnetic Data, Niti Mankhemthong

Open Access Theses & Dissertations

I use updated gravity data, available aeromagnetic data, and other geophysical information as constraints to develop 2D and 3D structural models of density and magnetic susceptibility to better locate and determine the shape of the Border Ranges fault system (BRFS), the Border Range ultramafic and mafic assemblages and other forearc-arc boundary structures in south-central Alaska, that have previously been studied in only limited detail. There are three geophysical research projects that form the chapters of the dissertation. First, I estimated near-surface density variations in the central Kenai Peninsula based on the adaptation of the Nettleton (1939)-Parasnis (1952) method using Tarantola …


Streamflow Analysis And A Comparison Of Hydrologic Metrics In Urban Streams, Matthew Lawton Wood Jan 2012

Streamflow Analysis And A Comparison Of Hydrologic Metrics In Urban Streams, Matthew Lawton Wood

Dissertations and Theses

This study investigates the hydrologic effects of urbanization in two Portland, Oregon streams through a comparison of three hydrologic metrics. Hydrologic metrics used in this study are the mean annual runoff ratio (Qa), mean seasonal runoff ratio (Qw and Qd), and the fraction of time that streamflow exceeds the mean streamflow during the year (TQmean). Additionally, the relative change in streamflow in response to storm events was examined for two watersheds. For this investigation urban development is represented by two urbanization metrics: percent impervious and road density. Descriptive and inferential statistics were used to evaluate the relationship between the hydrologic …


Public Policy And Sexual Geography In Portland, Oregon, 1970-2010, Elizabeth Morehead Jan 2012

Public Policy And Sexual Geography In Portland, Oregon, 1970-2010, Elizabeth Morehead

Dissertations and Theses

Drawing on the concept of sexual geography, this study examines the social and political meanings of sexualized spaces in the urban geography of Portland, Oregon between 1970 and 2010. This includes an examination of the sexual geography of urban spaces as a deliberate construct resulting from official and unofficial public policy and urban planning decisions. Sexual geographies, the collective and individual constructions of sexuality, are not static. Nor are definitions of deviant sexual practices fixed in the collective consciousness. Both are continuously being reshaped and reconstructed in response to changing economic structures and beliefs about sex, race and class. Primary …


New Methods For The Discovery And Characterization Of Lunar Lava Tubes Using Lunar Reconnaissance Orbiter Data, Jonathan Arthur Meyer Jan 2012

New Methods For The Discovery And Characterization Of Lunar Lava Tubes Using Lunar Reconnaissance Orbiter Data, Jonathan Arthur Meyer

Open Access Theses & Dissertations

Lava tubes have the potential to serve as a sustainable solution to long-term lunar habitation by providing protection from radiation and micrometeorite bombardment while potentially providing resources in the form of trapped water ice. They also pose compelling science targets in their own right. While the potential benefits of utilizing lunar lava tubes is clear, their discovery is less straightforward. Formation processes for lava tubes do not always result in a surface expression, making their discovery using remotely sensed imagery difficult. Furthermore, there is the potential for lava tubes to be covered by secondary lava flows, impact ejecta, or other …


Vertical Deformation Along The San Andreas Fault, Garrett Thornton Jan 2012

Vertical Deformation Along The San Andreas Fault, Garrett Thornton

Open Access Theses & Dissertations

There have been numerous M 6+ earthquakes along the San Andreas Fault System (SAFS) (Schwartz et al., 1984) (Figure. 1.1) in the historical past. These rupture events have created millions of dollars worth of damage, and have been responsible for multiple lives lost. An improved understanding of the motions and crustal characteristics along the SAFS can lead to better hazard mitigation (Bakun et al., 2005). Horizontal crustal motions of the SAFS have been widely studied and applied to seismic hazard models (WGCEP, 2007), however vertical motions are not often utilized due to their complicated origin and sometimes large uncertainties. This …


Impacts Of Urbanisation On The Native Avifauna Of Perth, Western Australia, Robert Davis, C Gole, Jd Roberts Jan 2012

Impacts Of Urbanisation On The Native Avifauna Of Perth, Western Australia, Robert Davis, C Gole, Jd Roberts

Research outputs 2012

Urban development either eliminates, or severely fragments, native vegetation, and therefore alters the distribution and abundance of species that depend on it for habitat. We assessed the impact of urban development on bird communities at 121 sites in and around Perth, Western Australia. Based on data from community surveys, at least 83 % of 65 landbirds were found to be dependent, in some way, on the presence of native vegetation. For three groups of species defined by specific patterns of habitat use (bushland birds), there were sufficient data to show that species occurrences declined as the landscape changed from variegated …


Geography Newsletter, 2011-2012, University Of Northern Iowa. Department Of Geography. Jan 2012

Geography Newsletter, 2011-2012, University Of Northern Iowa. Department Of Geography.

Geography Newsletter

Inside this issue:

-- Student/Community engagement
-- New Internship with Aerial Services
-- Spotlight on Research - Dennis Dahms finds evidence of climate change in Rocky Mountain Sediments
-- 2012 Awards Banquet
-- Scholarships
-- UNI Geography Outstanding Alumnus Award
-- Thomas Fogarty Retires after 23 years of service
-- Dr. Henry Owusu Publishes a new book
-- Student Publications and Presentations


Anarchism, Geography, And Queer Space-Making: Building Bridges Over Chasms We Create, Farhang Rouhani Jan 2012

Anarchism, Geography, And Queer Space-Making: Building Bridges Over Chasms We Create, Farhang Rouhani

Geography Articles

This paper examines the complex, creative, and contradictory processes of making queer space through an analysis of the rise and demise of the Richmond Queer Space Project (RQSP), a queer- and anarchist-identified organization in Richmond, Virginia, US. I begin by synthesizing emerging perspectives from anarchism, queer theory, and the conceptualization of queer space in geography. Then, I observe the practices through which RQSP members created a queer space; their location politics in a small-city context; and the contradictory politics of affinity and identity that led to the group’s demise. My goal is to seriously consider the complexities and contradictions of …


Mapping Latin America: A Cartographic Reader, Andrew Sluyter Jan 2012

Mapping Latin America: A Cartographic Reader, Andrew Sluyter

Faculty Publications

No abstract provided.


The Oxford Handbook Of Slavery In The Americas, Andrew Sluyter Jan 2012

The Oxford Handbook Of Slavery In The Americas, Andrew Sluyter

Faculty Publications

No abstract provided.


Richard Edes Harrison And The Cartographic Perspective Of Modern Internationalism, Timothy Barney Jan 2012

Richard Edes Harrison And The Cartographic Perspective Of Modern Internationalism, Timothy Barney

Rhetoric and Communication Studies Faculty Publications

Air-age globalism was a discursive phenomenon throughout the development of World War II that accounted for the rapid “shrinking” of the world through air technologies and the internationalization of American interests. Cartography became air-age globalism’s primary popular expression, and journalistic cartographers such as Richard Edes Harrison at Fortune magazine introduced new mapping projections and perspectives in response to these global changes. This essay argues that Harrison’s mapping innovations mediate a geopolitical shift in America toward a modern, image-based internationalism. Through recastings of “vision” and “strategy,” Harrison’s work offers an opportunity to assess the rhetorical tensions between idealism and realism in …


The Geography Of Greenhouse Gas Emissions From Within Urban Areas Of Asia, Jochen Albrecht, Peter Marcotullio, Andrea Sarzynski, Niels Schulz Jan 2012

The Geography Of Greenhouse Gas Emissions From Within Urban Areas Of Asia, Jochen Albrecht, Peter Marcotullio, Andrea Sarzynski, Niels Schulz

Publications and Research

This paper aims to advance two objectives: (1) identify and explore greenhouse gas emissions from urban areas in Asia at the regional level; and (2) explore covariates of urban greenhouse gas emissions. We use the Emissions Database for Global Atmospheric Research estimates for carbon dioxide, methane, nitrous oxide, and sulfur hexafluoride from 14 source activities for the year 2000, which are allocated on a 1/108 global grid. We extract emissions for 3535 urban extents all with populations over 50,000, accounting for approximately 91% of the region’s urban population. We use regression analysis to associate emissions with urban area and growth, …


Review Of Daniel Mockli's "Strategic Trends 2012: Key Developments In Global Affairs, Bert Chapman Jan 2012

Review Of Daniel Mockli's "Strategic Trends 2012: Key Developments In Global Affairs, Bert Chapman

Libraries Faculty and Staff Scholarship and Research

This review essay describes and analyzes the content of this annual compilation of international affairs essays published by the Zurich-based Center for Strategic Studies.


Using Self Organizing Maps To Analyze Demographics And Swing State Voting In The 2008 U.S. Presidential Election, Paul T. Pearson, Cameron I. Cooper Jan 2012

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.


Grts And Graphs: Monitoring Natural Resources In Urban Landscapes, Todd R. Lookingbill, John Paul Schmit, Shawn L. Carter Jan 2012

Grts And Graphs: Monitoring Natural Resources In Urban Landscapes, Todd R. Lookingbill, John Paul Schmit, Shawn L. Carter

Geography and the Environment Faculty Publications

Environmental monitoring programs are an important tool for providing land managers with a scientific basis for management decisions. However, many ecological processes operate on spatial scales that transcend management boundaries (Schonewald-Cox 1988). For example, adjacent lands may influence protected-area resources via edge effects, source-sink dynamics, or invasion processes (Jones et al. 2009). Hydrologic alterations outside management units also may have profound effects on the integrity of resources being managed (Pringle 2000). The impacts of climate change are presenting challenges to resource management at local-to-global scales (Karl et al. 2009). This potential disparity between ecological and political boundaries presents an interesting …


Remote Sensing Of Cloud Properties Using Oxygen A-Band Spectral Measurements, Siwei Li Jan 2012

Remote Sensing Of Cloud Properties Using Oxygen A-Band Spectral Measurements, Siwei Li

Legacy Theses & Dissertations (2009 - 2024)

Clouds play an important role in the climate system through their radiative effects and their vital link in the hydrological cycle. Detailed knowledge of the three dimensional (3-D) distribution of cloud macrophysical and microphysical properties is crucial to properly characterize radiative forcing by clouds and to quantify the response of the climate. In this study, a multi-layer cloud detection algorithm is developed by utilizing photon path length distributions retrieved from oxygen A-band spectral measurements. Case studies from measurements at the Atmospheric Radiation Measurement (ARM) Southern Great Plains (SGP) site demonstrate that this photon path length method can detect multi-layer clouds …


Modeling Intermittent And Perennial Headwater Stream Origins In North Carolina., Kevin Macleod Jan 2012

Modeling Intermittent And Perennial Headwater Stream Origins In North Carolina., Kevin Macleod

Theses and Dissertations

Low-order headwater streams, a link between the upland landscape and larger streams within a watershed, affect watershed hydrology. Yet current widely available maps inadequately depict headwater streams, underestimating channel length or omitting channels entirely. Intermittent and perennial headwater streams each provide unique habitat. Until recently, it has not been possible to accurately delineate these streams or predict channel flow durations without fieldwork. Recent advances in remote sensing may allow more accurate headwater stream mapping.

Methods for mapping intermittent and perennial headwater streams with a GIS-based modeling approach coupled with field verification were adapted, tested, and evaluated. Four models were developed …


Water Quality Trading Markets For The Kentucky River Basin: A Point Source Profile, Ronald Childress Jr. Jan 2012

Water Quality Trading Markets For The Kentucky River Basin: A Point Source Profile, Ronald Childress Jr.

Theses and Dissertations--Agricultural Economics

This study assessed the feasibility and suitability of a Water Quality Trading (WQT) program within the Kentucky River Basin (KRB). The study’s focal point was based on five success factors of a WQT program: environmental suitability, geospatial orientation, participant availability, regulatory incentive, and economic incentive. The study utilized these five success factors, geographical characteristics, and Discharge Monitoring Reports (DMR) to assess the feasibility of a WQT program.

The assessment divided the KRB into five eight digit Hydrologic Unit Codes (HUC), North, Middle, and South Fork, Middle Basin, and Lower Basin, to determine regional impacts caused by the nutrient PSs. Individual …


First Remote Sensing Observations Of Trifluoromethane (Hfc-23) In The Upper Troposphere And Lower Stratosphere, Jeremy J. Harrison, Christopher D. Boone, Alexander T. Brown, Nicholas D. C. Allen, Geoffrey C. Toon, Peter F. Bernath Jan 2012

First Remote Sensing Observations Of Trifluoromethane (Hfc-23) In The Upper Troposphere And Lower Stratosphere, Jeremy J. Harrison, Christopher D. Boone, Alexander T. Brown, Nicholas D. C. Allen, Geoffrey C. Toon, Peter F. Bernath

Chemistry & Biochemistry Faculty Publications

This work reports the first remote sensing measurements of atmospheric HFC-23 (CHF3) using solar occultation measurements made by the Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) and the Jet Propulsion Laboratory Mark IV (MkIV) balloon interferometer. A total of 8809 ACE occultations measured between 2004 and 2010 have been processed, along with 24 MkIV occultations measured between 1989 and 2007. ACE data (yearly averages over the 10-25 km altitude range) in the tropics/subtropics (40°S-40°N) reveal a trend of 4.0 ± 1.6% per year in the growth of HFC-23 for 2004-2009 (or 3.9 ± 1.2% per year for 2004-2010), …


Toxic Tourism: Promoting The Berkeley Pit And Industrial Heritage In Butte, Montana, Bridget R. Barry Jan 2012

Toxic Tourism: Promoting The Berkeley Pit And Industrial Heritage In Butte, Montana, Bridget R. Barry

Department of History: Dissertations, Theses, and Student Research

Butte, Montana’s Berkeley Pit and its deadly water are a part of the country’s largest Superfund site. In 1994 the United States Environmental Protection Agency (EPA) issued a Record of Decision designating Butte, along with the neighboring town and mining site of Anaconda (twenty-five miles northwest of Butte), and 120 miles of Montana’s Clark Fork River as a single Superfund complex. The vast mining operations undertaken in the area, including five hundred underground mines and four open pit mines, have resulted in hazardous concentrations of metals in groundwater, surface water, and soils.

Butte’s mines once extracted more tons of copper …


Land Abandonment And Wild Ungulates: Maintaining Open Spaces In Catalan Pre-Pyrenees, Joan M. Welch, Josep Vila Subiros, Diego Varga Linde Jan 2012

Land Abandonment And Wild Ungulates: Maintaining Open Spaces In Catalan Pre-Pyrenees, Joan M. Welch, Josep Vila Subiros, Diego Varga Linde

Geography & Planning 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 Jan 2012

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. …