Enhancing the National Climate Database with clifro

New Zealand’s National Climate Database,
CliFlo holds data from about 6500 climate
stations, with observations dating back to 1850. CliFlo returns raw data
at ten minute, hourly, and daily frequencies. CliFlo also returns
statistical summaries, inclusive of about eighty different types of
monthly and annual statistics and six types of thirty−year normals.

The clifro package is designed to minimise the hassle in downloading
data from CliFlo. It does this by providing functions for the user to
log in, easily choose the appropriate datatypes and stations, and then
query the database. Once the data have been downloaded, they are stored
as specific objects in R with the primary aim to ensure data
visualisation and exploration is done with minimal effort and maximum
efficiency.

This package extends the functionality of
CliFlo by returning stations resulting
from simultaneous searches, the ability to visualise where these climate
stations are by exporting to KML files, and elegant plotting of the
climate data. The vignettes and help files are written with the
intention that even inexperienced R users can use clifro easily.
Exporting the climate data from R is fairly easy and for more
experienced useRs, automated updating of spreadsheets or databases can
be made much easier.

Free CliFlo Subscription

A current CliFlo
subscription is
recommended for clifro, otherwise data from only one station is
available. The subscription is free and lasts for 2 years or 2,000,000
rows without renewal, which enables access to around 6,500 climate
stations around New Zealand and the Pacific.

Note this package requires internet access for connecting to the
National Climate Database web portal.

Installation in R

# Install the latest CRAN release
install.packages("clifro")

# Or the latest development version
if(!require(devtools))
  install.packages("devtools")
devtools::install_github("ropensci/clifro")

# Then load the package
library(clifro)

Getting Started

The following small example shows some of the core functionality in
clifro.

Where are the climate stations?

We can search for climate stations anywhere in New Zealand and return
the station information in the form of a KML file. For example, we can
return all the climate stations (current and historic) in the greater
Auckland region.

all.auckland.st = cf_find_station("Auckland", search = "region", status = "all")
cf_save_kml(all.auckland.st, "all_auckland_stations")

Note the open stations have green markers and the closed stations have
red markers.

Download and visualise public climate data

The only station available for unlimited public access to climate data
is the Reefton electronic weather station (EWS). We can download the
2014 wind and rain data and easily visualise the results very easily.

public.cfuser = cf_user()

# Choose the datatypes
daily.wind.rain.dt = cf_datatype(c(2, 3), c(1, 1), list(4, 1), c(1, NA))

# Choose the Reefton EWS station
reefton.st = cf_station()

# Send the query to CliFlo and retrieve the data
daily.datalist = cf_query(user = public.cfuser, 
                          datatype = daily.wind.rain.dt, 
                          station = reefton.st,
                          start_date = "2012-01-01 00",
                          end_date = "2013-01-01 00")
#> connecting to CliFlo...
#> reading data...
#> UserName is = public
#> Number of charged rows output = 0
#> Number of free rows output = 732
#> Total number of rows output = 732
#> Copyright NIWA 2020 Subject to NIWA's Terms and Conditions
#> See: http://clifloecd1.niwa.co.nz/pls/niwp/doc/terms.html
#> Comments to: [email protected]

# Have a look at what data is now available
daily.datalist
#> List containing clifro data frames:
#>               data      type              start                end rows
#> df 1) Surface Wind  9am only (2012-01-01  9:00) (2012-12-31  9:00)  366
#> df 2)         Rain     Daily (2012-01-01  9:00) (2012-12-31  9:00)  366

# Plot the data using default plotting methods
plot(daily.datalist)     # For the first dataframe  (Surface Wind)

plot(daily.datalist, 2)  # For the second dataframe (Rain)

For more details and reproducible examples, see the technical
report
for how to use clifro, including choosing datatypes, stations, saving
locations as KML files and easy, elegant plotting for various different
climate and weather data.

# View the clifro demo
demo(clifro)

# Read the 'Introduction to clifro' vignette
vignette("clifro")

Contributor Code of Conduct

The clifro package is released with a contributor code of
conduct. By
participating in this project you agree to abide by its terms.

Citation

To cite package ‘clifro’ in publications use:

Seers B and Shears N (2015). “New Zealand's Climate Data in R - An Introduction to clifro.” The University of Auckland, Auckland, New
Zealand. <URL: https://stattech.wordpress.fos.auckland.ac.nz/2015/03/25/2015-02-new-zealands-climate-data-in-r-an-introduction-to-clifro/>.

A BibTeX entry for LaTeX users is

  @TechReport{,
    title = {New Zealand's Climate Data in R --- An Introduction to clifro},
    author = {Blake Seers and Nick Shears},
    institution = {The University of Auckland},
    address = {Auckland, New Zealand},
    year = {2015},
    url = {https://stattech.wordpress.fos.auckland.ac.nz/2015/03/25/2015-02-new-zealands-climate-data-in-r-an-introduction-to-clifro/},
  }