This sea-level dataset is provided with in Appendix 7.2 of Foreman (1977)
and also with the
T_TIDE package (Pawlowicz et al., 2002). It results
from measurements made in 1975 at Tuktoyaktuk, Northwest Territories,
The data set contains 1584 points, some of which have NA for sea-level height.
Although Foreman's Appendix 7.2 states that times are in Mountain standard
time, the timezone is set to
UTC in the present case, so that the
results will be similar to those he provides in his Appendix 7.3.
Until Jan 6, 2018, the time in this dataset had been increased by 7 hours. However, this alteration was removed on this date, to make for simpler comparison of amplitude and phase output with the results obtained by Foreman (1977) and Pawlowicz et al. (2002).
The data were based on the
T_TIDE dataset, which in turn
seems to be based on Appendix 7.2 of Foreman (1977). Minor editing was on
file format, and then the
sealevelTuktoyaktuk object was created
Foreman, M. G. G., 1977. Manual for tidal heights analysis and prediction. Pacific Marine Science Report 77-10, Institute of Ocean Sciences, Patricia Bay, Sidney, BC, 58pp.
Pawlowicz, Rich, Bob Beardsley, and Steve Lentz, 2002. Classical tidal
harmonic analysis including error estimates in MATLAB using
Computers and Geosciences, 28, 929-937.
Other datasets provided with oce:
Other things related to sealevel data:
library(oce) data(sealevelTuktoyaktuk) time <- sealevelTuktoyaktuk[["time"]] elevation <- sealevelTuktoyaktuk[["elevation"]] oce.plot.ts(time, elevation, type='l', ylab="Height [m]", ylim=c(-2, 6)) legend("topleft", legend=c("Tuktoyaktuk (1975)","Detided"), col=c("black","red"),lwd=1) tide <- tidem(sealevelTuktoyaktuk) detided <- elevation - predict(tide) lines(time, detided, col="red")
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