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#' Time series of NASA/GISS land-ocean temperature index
#'
#' A data frame containing the Goddard Institute for Space Studies (GISS) time
#' series called LOTI (Land-Ocean Temperature Index) of surface temperature
#' anomaly.
#'
#' This is data frame with columns named `year` for decimal year (sampled
#' monthly and represented here at mid-month, i.e. the first sample in any given
#' year is at year+1/24) and `index` for the temperature anomaly. The
#' resolution of the latter is 0.01C. The details of the original data
#' processing are provided in References 1 and 2, and the site of the (Land-Ocean
#' Temperature Index. Anyone using the present dataset is advised very strongly
#' to read the NASA documents on changes to the processing of the data (see
#' Reference 3).
#'
#' The data were downloaded from Reference 1, yielding a text file that starts
#' as in shown below. These data were then read with R code (reference 5) that
#' skips the headers, chops out the annual means and then assigns columns to
#' year fractions, e.g. the first two numbers in the data shown below are -29
#' and -20, yielding values -0.29degC and -0.20degC, and times are here
#' represented as 1880+1/24 and 1880+3/24, i.e. 1880.042 and 1880.125.
#'
#'```
#' GLOBAL Land-Ocean Temperature Index in 0.01 degrees Celsius base period: 1951-1980
#'
#' sources: GHCN-v3 1880-11/2015 + SST: ERSST v4 1880-11/2015
#' using elimination of outliers and homogeneity adjustment
#' Notes: 1950 DJF = Dec 1949 - Feb 1950 ; ***** = missing
#'
#' AnnMean
#' Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec J-D D-N DJF MAM JJA SON Year
#' 1880 -29 -20 -18 -27 -14 -28 -22 -7 -16 -15 -18 -20 -19 *** **** -19 -19 -16 1880
#' 1881 -9 -13 2 -2 -4 -28 -5 -2 -8 -19 -25 -14 -11 -11 -14 -1 -12 -17 1881
#' 1882 10 9 2 -19 -17 -24 -9 4 0 -22 -20 -24 -9 -8 1 -11 -10 -14 1882
#'```
#'
#' @name giss
#'
#' @docType data
#'
#' @usage data(giss, package="ocedata")
#'
#' @references
#'
#' 1. Web location of the raw LOTI data:
#' \url{https://data.giss.nasa.gov/gistemp/tabledata_v3/GLB.Ts+dSST.txt}
#'
#' 2. GISTEMP Team, 2015: GISS Surface Temperature Analysis (GISTEMP). NASA
#' Goddard Institute for Space Studies.
#' \url{https://data.giss.nasa.gov/gistemp/}
#'
#' 3. J. Hansen, R. Ruedy, M. Sato and K. Lo, 2010. Global surface temperature
#' change. *Rev. Geophys.*, 48, RG4004.
#' \url{https://pubs.giss.nasa.gov/abs/ha00510u.html}
#'
#' 4. Updates to analysis: \url{https://data.giss.nasa.gov/gistemp/updates_v3/}
#'
#' 5. R code to convert from NASA format to the format stored here
#' \url{https://github.com/dankelley/ocedata/blob/master/create_data/giss/create_giss.R}
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