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The recent paper by Simpson et al. [Remote Sens. Environ. 72 (2000) 191.] on failures to detect volcanic ash using the ‘reverse’ absorption technique provides a timely reminder of the danger that volcanic ash presents to aviation and the urgent need for some form of effective remote detection. The paper unfortunately suffers from a fundamental flaw in its(More)
Overview For the past two years, radio industry leaders have collaborated to address the complex challenge of developing new radio data for marketing mix models. Upgraded and more granular radio data, which are more appropriate for the models, were developed and field-tested against previous radio data in three real-world marketing mix models. The tests(More)
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