Geographies of care: A commentary     

Christine Milligan  Sarah Atkinson  Mark Skinner  Janine Wiles 《New Zealand geographer》2007,63(2):135-140

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Online GPS processing services: an initial study   总被引：1，自引：2，他引：1  

Reza Ghoddousi-Fard  Peter Dare 《GPS Solutions》2006,10(1):12-20

There are a number of online Global Positioning System (GPS) processing services that provide GPS processing results to the user free of charge and with unlimited access. These services provide solutions for a user-submitted Receiver Independent Exchange Format (RINEX) file based on differential methods using reference stations or precise point positioning using precise GPS orbit and clock data. Different data sets varying in time and location were submitted to the online services and their results compared. Although the quality of results depends on many factors, in most cases the users can expect reliable online processing results for a 10-h data set made by a geodetic dual frequency receiver anywhere in the world.  相似文献   

Critical Issues in Participatory GIS: Deconstructions, Reconstructions, and New Research Directions   总被引：5，自引：0，他引：5  

Sarah Elwood 《Transactions in GIS》2006,10(5):693-708

In the mid‐1990s, several critical texts raised concerns about the social, political, and epistemological implications of GIS. Subsequent responses to these critiques have fundamentally altered the technological, political, and intellectual practices of GIScience. Participatory GIS, for instance, has intervened in multiple ways to try to ameliorate uneven access to GIS and digital spatial data and diversify the forms of spatial knowledge and spatial logic that may be incorporated in a GIS. While directly addressing core elements of the ‘GIS & Society’ critique, these reconstructions of a critical GIScience introduce their own ambiguities with respect to access, equity, digital representation of spatial knowledge, and epistemologies of new GIS research practices. In this paper, I examine some of the new and persistent ambiguities of participatory GIS that bear inclusion in future critical GIScience research.  相似文献   

Conceptual model of sediment processes in the upper Yuba River watershed, Sierra Nevada, CA   总被引：1，自引：0，他引：1  

Jennifer A. Curtis  Lorraine E. Flint  Charles N. Alpers  Sarah M. Yarnell 《Geomorphology》2005,68(3-4):149-166

This study examines the development of a conceptual model of sediment processes in the upper Yuba River watershed; and we hypothesize how components of the conceptual model may be spatially distributed using a geographical information system (GIS). The conceptual model illustrates key processes controlling sediment dynamics in the upper Yuba River watershed and was tested and revised using field measurements, aerial photography, and low elevation videography. Field reconnaissance included mass wasting and channel storage inventories, assessment of annual channel change in upland tributaries, and evaluation of the relative importance of sediment sources and transport processes. Hillslope erosion rates throughout the study area are relatively low when compared to more rapidly eroding landscapes such as the Pacific Northwest and notable hillslope sediment sources include highly erodible andesitic mudflows, serpentinized ultramafics, and unvegetated hydraulic mine pits. Mass wasting dominates surface erosion on the hillslopes; however, erosion of stored channel sediment is the primary contributor to annual sediment yield. We used GIS to spatially distribute the components of the conceptual model and created hillslope erosion potential and channel storage models. The GIS models exemplify the conceptual model in that landscapes with low potential evapotranspiration, sparse vegetation, steep slopes, erodible geology and soils, and high road densities display the greatest hillslope erosion potential and channel storage increases with increasing stream order. In-channel storage in upland tributaries impacted by hydraulic mining is an exception. Reworking of stored hydraulic mining sediment in low-order tributaries continues to elevate upper Yuba River sediment yields. Finally, we propose that spatially distributing the components of a conceptual model in a GIS framework provides a guide for developing more detailed sediment budgets or numerical models making it an inexpensive way to develop a roadmap for understanding sediment dynamics at a watershed scale.  相似文献   

Constructing the News: The Role of Local Newspapers in Environmental Risk Communication*     

Sarah E. L. Wakefield  Susan J. Elliott 《The Professional geographer》2003,55(2):216-226

Effective risk communication is central to good environmental risk management. While studies have shown that newspapers are the primary source of information to the public regarding environmental issues, little is known about how environmental news is used as a risk‐communication tool. This article explores the role of local information systems in risk communication, using newspaper content analysis as well as in‐depth interviews with journalists and community residents to develop a case study of an environmental assessment process for a nonhazardous industrial‐waste landfill. Results indicate that risk messages were chosen and shaped by journalists on the basis of their own exigencies. In addition, while newspapers were a major source of risk information, their impact was mitigated by resident distrust and access to other information sources, most notably their own personal information networks. These results have implications for environmental policy, as decision makers often use—either passively or actively—print media as a risk‐communication tool.  相似文献   

Possible outburst floods from debris-covered glaciers in the Sierra Nevada, California   总被引：1，自引：0，他引：1  

Sarah K. Konrad 《Geografiska Annaler: Series A, Physical Geography》1998,80(3-4):183-192

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Deconstructing consultative frameworks: the case of staff housing provision in Burringurrah,Western Australia     

Sarah Prout 《The Australian geographer》2004,35(1):95-110

Housing for government‐employed staff in remote Aboriginal communities is a topic that raises considerable debate amongst those whom it affects. Striking at the heart of Australia's effort towards reconciliation and a legacy of policy failure, debate regarding standards and siting of staff housing is highly political in nature. In Burringurrah, Western Australia, two government agencies recently undertook projects to provide staff housing within the community. Each agency approached its projects differently, but in both cases response at the ‘grassroots’ level was negative. This paper argues that a primary, but indirect, influence on ‘community’ satisfaction was the ideological structure of each agency. It follows, then, that understanding this organisational context is crucial to achieving more appropriate housing outcomes in the community.  相似文献   

Distributed deformation in the subducting lithosphere at Tonga     

Sarah Nothard  John Haines  James Jackson  Bill Holt 《Geophysical Journal International》1996,127(2):328-338

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Globalized Agriculture. Political Choice By R. Le Heron.     

Sarah Whatmore 《New Zealand geographer》1995,51(2):60a-61

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Managing South Africa's trawl bycatch     

Walmsley  Sarah A.; Leslie  Rob W.; Sauer  Warwick H. H. 《ICES Journal of Marine Science》2007,64(2):405-412

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