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Articles 1 - 4 of 4
Full-Text Articles in Social and Behavioral Sciences
Melting Of Small Arctic Ice Caps Observed From Ers Scatterometer Time Series, Laurence C. Smith, Yongwei Sheng, Richard R. Forster, Konrad Steffen, Karen E. Frey, Douglas E. Alsdorf
Melting Of Small Arctic Ice Caps Observed From Ers Scatterometer Time Series, Laurence C. Smith, Yongwei Sheng, Richard R. Forster, Konrad Steffen, Karen E. Frey, Douglas E. Alsdorf
Geography
Time series of active microwave backscatter data from the ERS Wind Scatterometers are used to demonstrate (1) the timing of melt onset can be observed over small ice caps, as well as the major ice sheets and multi-year sea ice; add (2) temporally integrated backscatter reduction (R) is strongly correlated with total annual positive-degree-days (PDD), as measured at four automated weather stations on the surface of the Greenland Ice Sheet. The latter is particularly interesting because unlike melt onset, R is a measure of melt processes integrated over an entire ablation season. Both methods work owing to the well-known sharp …
A Conversation With Cynthia Enloe: Feminists Look At Masculinity And The Men Who Wage War, Carol Cohn, Cynthia Enloe
A Conversation With Cynthia Enloe: Feminists Look At Masculinity And The Men Who Wage War, Carol Cohn, Cynthia Enloe
Sustainability and Social Justice
Interviews feminist Cynthia Enloe. Role of feminists in international politics; Understanding the dynamics of masculinity; Aim to understand the genderings of institutional cultures inside international aid organizations; Feminist investigations of institutional political cultures and monitoring of postwar demilitarization.
Land-Cover Change Monitoring With Classification Trees Using Landsat Tm And Ancillary Data, John Rogan, Jennifer Miller, Doug Stow, Janet Franklin, Lisa Levien, Chris Fischer
Land-Cover Change Monitoring With Classification Trees Using Landsat Tm And Ancillary Data, John Rogan, Jennifer Miller, Doug Stow, Janet Franklin, Lisa Levien, Chris Fischer
Geography
We monitored land-cover change in San Diego County (1990-1996) using multitemporal Landsat TM data. Change vectors of Kauth Thomas features were combined with stable multitemporal Kauth Thomas features and a suite of ancillary variables within a classification tree classifier. A combination of aerial photointerpretation and field measurements yielded training and validation data. Maps of land-cover change were generated for three hierarchical levels of change classification of increasing detail: change vs. no-change; four classes representing broad increase and decrease classes; and nine classes distinguishing increases or decreases in tree canopy cover, shrub cover, and urban change. The multitemporal Kauth Thomas (both …
Measuring The Physical Composition Of Urban Morphology Using Multiple Endmember Spectral Mixture Models, Tarek Rashed, John R. Weeks, Dar Roberts, John Rogan, Rebecca Powell
Measuring The Physical Composition Of Urban Morphology Using Multiple Endmember Spectral Mixture Models, Tarek Rashed, John R. Weeks, Dar Roberts, John Rogan, Rebecca Powell
Geography
The application of multiple endmember spectral mixture analysis (MESMA) to map the physical composition of urban morphology using Landsat Thematic Mapper (TM) data is evaluated and tested. MESMA models mixed pixels as linear combinations of pure spectra, called endmembers, while allowing the types and number of endmembers to vary on a per-pixel basis. A total of 63 two-, three-, and four-endmember models were applied to a Landsat TM image for Los Angeles County, and a smaller subset of these models was chosen based on fraction and root-mean-squared error (RMSE) criteria. From this subset, an optimal model was selected for each …