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An Angular Version of Spatial Correlations, with Exact Significance Tests
Author(s) -
Simon Gary
Publication year - 1997
Publication title -
geographical analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.773
H-Index - 65
eISSN - 1538-4632
pISSN - 0016-7363
DOI - 10.1111/j.1538-4632.1997.tb00962.x
Subject(s) - polar coordinate system , isotropy , mathematics , plot (graphics) , geometry , polar , statistics , correlation , geodesy , physics , geology , optics , astronomy
Spatial correlations are replaced by ordinary correlations by projecting the two‐dimensional coordinates of a map onto a single axis making angle θ with the horizontal (east‐west) axis. This calculation permits the use of exact test statistics. Moreover, the correlations can be plotted in polar coordinate form and the significance of the maximum correlation can be tested. The plot is a useful aid in assessing the reasonableness of the isotropy assumption.