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README

rtide is an R package to calculate tide heights based on tide station harmonics.

It includes the harmonics data for 637 US stations.

To install the latest release from CRAN

install.packages("rtide")

To install the developmental version from GitHub

# install.packages("pak")
pak::pak("millerlp/rtide")

library(tibble)
library(rtide)
#> rtide is not suitable for navigation

data <- rtide::tide_height(
  "Monterey Harbor",
  from = as.Date("2016-07-13"), to = as.Date("2016-07-15"),
  minutes = 10L, tz = "America/Los_Angeles"
)

print(data)
#> # A tibble: 432 × 3
#>    Station                               DateTime            TideHeight
#>    <chr>                                 <dttm>                   <dbl>
#>  1 Monterey, Monterey Harbor, California 2016-07-13 00:00:00      0.514
#>  2 Monterey, Monterey Harbor, California 2016-07-13 00:10:00      0.496
#>  3 Monterey, Monterey Harbor, California 2016-07-13 00:20:00      0.481
#>  4 Monterey, Monterey Harbor, California 2016-07-13 00:30:00      0.468
#>  5 Monterey, Monterey Harbor, California 2016-07-13 00:40:00      0.457
#>  6 Monterey, Monterey Harbor, California 2016-07-13 00:50:00      0.449
#>  7 Monterey, Monterey Harbor, California 2016-07-13 01:00:00      0.443
#>  8 Monterey, Monterey Harbor, California 2016-07-13 01:10:00      0.440
#>  9 Monterey, Monterey Harbor, California 2016-07-13 01:20:00      0.439
#> 10 Monterey, Monterey Harbor, California 2016-07-13 01:30:00      0.441
#> # ℹ 422 more rows

library(ggplot2)
library(scales)

ggplot(data = data, aes(x = DateTime, y = TideHeight)) +
  geom_line() +
  scale_x_datetime(
    name = "Date",
    labels = date_format("%d %b %Y", tz = "America/Los_Angeles")
  ) +
  scale_y_continuous(name = "Tide Height (m)") +
  ggtitle("Monterey Harbour")

Tide heights can be also obtained using rtide through a shiny interface developed by Seb Dalgarno.

Please report any issues.

Pull requests are always welcome.

The harmonics data was converted from https://github.com/poissonconsulting/rtide/blob/main/data-raw/harmonics-dwf-20151227-free.tar.bz2, NOAA web site data processed by David Flater for XTide. The code to calculate tide heights from the harmonics is based on XTide.

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