Coerce Data Into a cm Object
Usage
as.cm(
time,
u = NULL,
v = NULL,
pressure = NULL,
conductivity = NULL,
temperature = NULL,
salinity = NULL,
longitude = NA,
latitude = NA,
filename = "",
debug = getOption("oceDebug")
)Arguments
- time
A vector of times of observation, or an
oceobject 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. Iftimeis anoceobject, then all of the following arguments are ignored.- u, v
optional numerical vectors containing the x and y components of velocity (m/s).
- pressure, conductivity, salinity, temperature
optional numerical vectors containing pressure (dbar), electrical conductivity, practical salinity, and in-situ temperature (degree C).
- longitude, latitude
optional position specified in degrees East and North.
- filename
optional source file name.
- debug
an integer specifying whether debugging information is to be printed during the processing. This is a general parameter that is used by many
ocefunctions. Generally, settingdebug=0turns off the printing, while higher values suggest that more information be printed. If one function calls another, it usually reduces the value ofdebugfirst, so that a user can often obtain deeper debugging by specifying higherdebugvalues.
See also
Other things related to cm data:
[[,cm-method,
[[<-,cm-method,
applyMagneticDeclination,cm-method,
cm,
cm-class,
plot,cm-method,
read.cm(),
rotateAboutZ(),
subset,cm-method,
summary,cm-method
Examples
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: 2025-04-19 12:29:11 to 2025-04-19 12:30:01 (51 samples, mean increment 1 s)
#> * Data Overview
#>
#> Min. Mean Max. Dim. NAs
#> time 1745076552 1745076577 1745076602 51 0
#> u [m/s] -2.8628 0.0070087 3.2703 51 0
#> v [m/s] -2.5653 0.23561 2.4359 51 0
#> pressure [dbar] 98.1 100.02 101.88 51 0
#>
#> * Processing Log
#>
#> - 2025-04-19 15:29:11 UTC: `create 'cm' object`
#> - 2025-04-19 15:29:11 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 1214870400 1214870430 1214870460 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)`
#> - 2025-04-19 15:29:11 UTC: `as.cm(time = adv)`