Surface scattering properties estimated from modeling airborne multiple emission angle reflectance data

Here, researchers apply the Hapke function to airborne bidirectional reflectance data collected over three terrestrial surfaces. The objectives of the study were to test the range of natural surfaces that the Hapke model fits and to evaluate model parameters in terms of known surface properties. The data used are multispectral and multiple emission angle data collected during the Geologic Remote Sensing Field Experiment (GRSFE) over a mud-cracked playa, an artificially roughened playa, and a basalt cobble strewn playa at Lunar Lake Playa in Nevada. Airborne remote sensing data and associated field measurements were acquired at the same time. The airborne data were acquired by the Advanced Solid State Array Spectroradiometer (ASAS) instrument, a 29-spectral band imaging system. ASAS reflectance data for a cobble-strewn surface and an artificially rough playa surface on Lunar Lake Playa can be explained with the Hanke model. The cobble and rough playa sites are distinguishable by a single scattering albedo, which is controlled by material composition; by the roughness parameter, which appears to be controlled by the surface texture and particle size; and the symmetry factor of the single particle phase function, which is controlled by particle size and shape. A smooth playa surface consisting of compacted, fine-grained particles has reflectance variations that are also distinct from either the cobble site or rough playa site. The smooth playa appears to behave more like a Lambertian surface that cannot be modeled with the Hapke function

Sport, migration, and gender in the neoliberal age

This ethnographic collection explores how neoliberalism has permeated the bodies, subjectivities, and gender of youth around the world as global sport industries have expanded their reach into marginal areas, luring young athletes with the dream of pursuing athletic careers in professional leagues of the Global North. Neoliberalism has reconfigured sport since the 1980s, as sport clubs and federations have become for-profit businesses, in conjunction with television and corporate sponsors. Neoliberal sport has had other important effects, which are rarely the object of attention: as the national economies of the Global South and local economies of marginal areas of the Global North have collapsed under pressure from global capital, many young people dream of pursuing a sport career as an escape from poverty. But this elusive future is often located elsewhere, initially in regional centres, though ultimately in the wealthy centres of the Global North that can support a sport infrastructure. The pursuit of this future has transformed kinship relations, gender relations, and the subjectivities of people. This collection of rich ethnographies from diverse regions of the world, from Ghana to Finland and from China to Fiji, pulls the reader into the lives of men and women in the global sport industries, including aspiring athletes, their families, and the agents, coaches, and academy directors shaping athletes’ dreams. It demonstrates that the ideals of neoliberalism spread in surprising ways, intermingling with categories like gender, religion, indigeneity, and kinship. Athletes’ migrations provide a novel angle on the global workings of neoliberalism. This book will be of key interest to scholars in Gender Studies, Anthropology, Sport Studies, and Migration Studies

2014 Iowa Land Value Survey: Overview

This briefing paper includes background information on the Iowa land value survey, including historic information, an analysis of highest/lowest land values and changes from last year’s survey

PowerAqua: fishing the semantic web

The Semantic Web (SW) offers an opportunity to develop novel, sophisticated forms of question answering (QA). Specifically, the availability of distributed semantic markup on a large scale opens the way to QA systems which can make use of such semantic information to provide precise, formally derived answers to questions. At the same time the distributed, heterogeneous, large-scale nature of the semantic information introduces significant challenges. In this paper we describe the design of a QA system, PowerAqua, designed to exploit semantic markup on the web to provide answers to questions posed in natural language. PowerAqua does not assume that the user has any prior information about the semantic resources. The system takes as input a natural language query, translates it into a set of logical queries, which are then answered by consulting and aggregating information derived from multiple heterogeneous semantic sources

Measuring income for catastrophic cost estimates: Limitations and policy implications of current approaches.

There is increasing global policy interest in estimating catastrophic costs incurred by households because of ill health, and growing need for information on disease-specific household cost data. There are several methodological approaches used to estimate income and no current consensus on the best method for estimating income in the context of a survey at the health facility. We compared six different approaches to estimate catastrophic cost among patients attending a health facility in South Africa. We used patient cost and income data collected June 2014-March 2015 from 66 participants enrolled in a clinical trial in South Africa (TB FastTrack) to explore the variation arising from different income estimation approaches and compared the number of households encountering catastrophic costs derived for each approach. The total proportion of households encountering catastrophic costs varied from 0% to 36%, depending on the estimation method. Self-reported mean annual income was significantly lower than permanent income estimated using an asset linking approach, or income estimated using the national average. A disproportionate number of participants adopting certain coping strategies, including selling assets and taking loans, were unable to provide self-reported income data. We conclude that the rapid methods for estimating income among patients attending a health facility are currently inconsistent. Further research on methods for measuring income, comparing the current recommended methods to 'gold standard' methods in different settings, should be done to identify the most appropriate measurement method