mapasp <- function(data, xlim = bbox(data)[1,], ylim = bbox(data)[2,]) {
# calculates aspect ratio for levelplot of geographic data,
# using proportial units (compare eqscplot)
if (!is(data, "Spatial"))
stop("cannot extract coordinates bounding box from data")
if (!(is.na(slot(slot(data, "proj4string"), "projargs")) || is.projected(data)))
(diff(ylim)/diff(xlim)) / cos((mean(ylim) * pi)/180)
else
diff(ylim)/diff(xlim)
}
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