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15 lines
237 B
15 lines
237 B
valid_date <- function(date) {
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as.POSIXlt(date[1])
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}
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valid_lon <- function(lon) {
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lon <- lon[1]
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stopifnot(lon >= -180 & lon <= 180)
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lon
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}
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valid_lat <- function(lat) {
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lat <- lat[1]
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stopifnot(lat >= -90 & lat <= 90)
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lat
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}
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