Coerce Data Into a cm Object
as.cm(
time,
u = NULL,
v = NULL,
pressure = NULL,
conductivity = NULL,
temperature = NULL,
salinity = NULL,
longitude = NA,
latitude = NA,
filename = "",
debug = getOption("oceDebug")
)A vector of times of observation, or an oce object from which time
and two velocity components can be inferred, e.g. an adv object, or
an adp object that has only one distance bin. If time is an oce object,
then all of the following arguments are ignored.
optional numerical vectors containing the x and y components of velocity (m/s).
optional numerical vectors containing pressure (dbar), electrical conductivity, practical salinity, and in-situ temperature (degree C).
optional position specified in degrees East and North.
optional source file name.
an integer specifying whether debugging information is
to be printed during the processing. This is a general parameter that
is used by many oce functions. Generally, setting debug=0
turns off the printing, while higher values suggest that more information
be printed. If one function calls another, it usually reduces the value of
debug first, so that a user can often obtain deeper debugging
by specifying higher debug values.
Other things related to cm data:
[[,cm-method,
[[<-,cm-method,
applyMagneticDeclination,cm-method,
cm-class,
cm,
plot,cm-method,
read.cm(),
rotateAboutZ(),
subset,cm-method,
summary,cm-method
library(oce)
# Example 1: creation from scratch
t <- Sys.time() + 0:50
u <- sin(2*pi*0:50/5) + rnorm(51)
v <- cos(2*pi*0:50/5) + rnorm(51)
p <- 100 + rnorm(51)
summary(as.cm(t, u, v, p))
#> Cm summary
#> ----------
#>
#> * North: magnetic
#> * Time: 2023-09-21 12:03:32 to 2023-09-21 12:04:22 (51 samples, mean increment 1 s)
#> * Data Overview
#>
#> Min. Mean Max. Dim. NAs
#> time 2023-09-21 15:03:32 2023-09-21 15:03:57 2023-09-21 15:04:22 51 0
#> u [m/s] -2.5349 -0.16937 1.6724 51 0
#> v [m/s] -3.186 0.018402 2.6187 51 0
#> pressure [dbar] 97.926 99.849 102.17 51 0
#>
#> * Processing Log
#>
#> - 2023-09-21 15:03:32 UTC: `create 'cm' object`
#> - 2023-09-21 15:03:32 UTC: `as.cm(time = t, u = u, v = v, pressure = p)`
# Example 2: creation from an adv object
data(adv)
summary(as.cm(adv))
#> Cm summary
#> ----------
#>
#> * File source: "(file name redacted)"
#> * Serial Num.: (serial number redacted)
#> * North: magnetic
#> * Time: 2008-07-01 00:00:00 to 2008-07-01 00:00:59 (480 samples, mean increment 0.1250001 s)
#> * Data Overview
#>
#> Min. Mean Max. Dim. NAs
#> time 2008-07-01 00:00:00 2008-07-01 00:00:30 2008-07-01 00:00:59 480 0
#> u [m/s] -0.080871 -0.027275 0.012168 480 0
#> v [m/s] -0.0090777 0.021877 0.057789 480 0
#> pressure [dbar] 16.85 16.866 16.879 480 0
#>
#> * Processing Log
#>
#> - 2015-12-23 17:53:39 UTC: `read.oce(file = "/data/archive/sleiwex/2008/moorings/m05/adv/nortek_1943/raw/adv_nortek_1943.vec", from = as.POSIXct("2008-06-25 00:00:00", tz = "UTC"), to = as.POSIXct("2008-07-06 00:00:00", tz = "UTC"), latitude = 47.87943, longitude = -69.72533)`
#> - 2015-12-23 17:53:54 UTC: `retime(x = m05VectorBeam, a = 0.58, b = 6.3892e-07, t0 = as.POSIXct("2008-07-01 00:00:00", tz = "UTC"))`
#> - 2015-12-23 17:53:55 UTC: `subset(x, subset=as.POSIXct("2008-06-25 13:00:00", tz = "UTC") <= time & time <= as.POSIXct("2008-07-03 00:50:00", tz = "UTC"))`
#> - 2015-12-23 17:53:55 UTC: `oceEdit(x = m05VectorBeam, item = "transformationMatrix", value = rbind(c(11033, -5803, -5238), c(347, -9622, 9338), c(-1418, -1476, -1333))/4096, reason = "Nortek email 2011-02-14", person = "DEK")`
#> - 2015-12-23 17:53:55 UTC: `use aquadoppHR heading; despike own pitch and roll`
#> - 2015-12-23 17:54:11 UTC: `beamToXyzAdv(x = x)`
#> - 2015-12-23 17:54:34 UTC: `xyzToEnu(x, declination=-18.099, horizontalCase=TRUE, sensorOrientiation=upward, debug=0)`
#> - 2023-09-21 15:03:33 UTC: `as.cm(time = adv)`