This paper introduces a novel algorithm to compute equivalent latitude by applying regions of interest (ROI). The technique is illustrated using code written in Interactive Data Language (IDL). The ROI method is compared with the "piecewise-constant" method, the approach commonly used in atmospheric sciences, using global fields of atmospheric potential vorticity. The ROI method is considerably more accurate and computationally faster than the piecewise-constant method, and it also works well with irregular grids. Both the ROI and piecewise-constant IDL codes for equivalent latitude are included as a useful reference for the research community.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3783454 | PMC |
| http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0072970 | PLOS |
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