as.sealevel {oce} | R Documentation |
Coerces a dataset (minimally, a sequence of times and heights) into a sealevel dataset. The arguments are based on the standard data format, as were described in a file formerly available at [1].
as.sealevel(elevation, time, header = NULL, stationNumber = NA, stationVersion = NA, stationName = NULL, region = NULL, year = NA, longitude = NA, latitude = NA, GMTOffset = NA, decimationMethod = NA, referenceOffset = NA, referenceCode = NA, deltat)
elevation |
a list of sea-level heights in metres, in an hourly sequence. |
time |
optional list of times, in POSIXct format. If missing, the list will be constructed assuming hourly samples, starting at 0000-01-01 00:00:00. |
header |
a character string as read from first line of a standard data file. |
stationNumber |
three-character string giving station number. |
stationVersion |
single character for version of station. |
stationName |
the name of station (at most 18 characters). |
region |
the name of the region or country of station (at most 19 characters). |
year |
the year of observation. |
longitude |
the longitude in decimal degrees, positive east of Greenwich. |
latitude |
the latitude in decimal degrees, positive north of the equator. |
GMTOffset |
offset from GMT, in hours. |
decimationMethod |
a coded value, with 1 meaning filtered, 2 meaning a simple average of all samples, 3 meaning spot readings, and 4 meaning some other method. |
referenceOffset |
? |
referenceCode |
? |
deltat |
optional interval between samples, in hours (as for the
|
An object of class
"sealevel"
(for
details, see read.sealevel
).
Dan Kelley
http://ilikai.soest.hawaii.edu/rqds/hourly.fmt
(this link
worked for years but failed at least temporarily on December 4, 2016).
The documentation for sealevel-class
explains the
structure of sealevel objects, and also outlines the other functions dealing
with them.
Other things related to sealevel
data: [[,sealevel-method
,
[[<-,sealevel-method
,
plot,sealevel-method
,
read.sealevel
,
sealevel-class
,
sealevelTuktoyaktuk
,
sealevel
,
subset,sealevel-method
,
summary,sealevel-method
library(oce) # Construct a year of M2 tide, starting at the default time # 0000-01-01T00:00:00. h <- seq(0, 24*365) elevation <- 2.0 * sin(2*pi*h/12.4172) sl <- as.sealevel(elevation) summary(sl) # As above, but start at the Y2K time. time <- as.POSIXct("2000-01-01") + h * 3600 sl <- as.sealevel(elevation, time) summary(sl)