Landscape scholars and information scientists are often interested in the structure of knowledge and the relationships of subject areas to each other. This study examines the latent structure of the transportation citation universe as evidence concerning how connected or disjointed areas of knowledge are to each other. Multivariate statistical analysis techniques were performed on citation data from 16 years of transportation articles in Landscape Journal, Landscape Research, Landscape and Urban Planning. The study produced 101 source articles and 1351 citation articles, arranged in 31 Library of Congress subject areas. Principal component analysis revealed thirteen significant dimensions. The results suggest that the universe is complex, yet disjointed and reinforce the notion that investigations in transportation related to landscape are fragmented and disconnected.
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Burley et al. (2009) studied this question.
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