| reduct.compass {skyscapeR} | R Documentation |
Data reduction for compass measurements
Description
This function calculates the true azimuth of a structure measured with a compass.
Usage
reduct.compass(loc, mag.az, date, magdec, alt, name, ID, HWT.ID)
Arguments
loc |
Location, either a skyscapeR.object or a vector containing the latitude, longitude and elevation of location, in this order. |
mag.az |
Array of magnetic azimuth measurements. |
date |
(Optional) Date of measurements as a string in the format: 'YYYY/MM/DD'. Only necessary if magdec is not given. |
magdec |
(Optional) Magnetic declination, if known. |
alt |
(Optional) Altitude, necessary for automatic declination calculation. If missing and loc is a skyscapeR.horizon object then the altitude will be automatically read from the horizon profile. |
name |
(Optional) Names or labels to identify each measurement. |
ID |
(Optional) IDs or codes to identify each measurement. |
HWT.ID |
(Optional) HeyWhatsThat IDs relating to a previously generated horizon profile for measurement. |
See Also
Examples
loc <- c(35,-7, 100)
mag.az <- c(89.5, 105, 109.5)
data <- reduct.compass(loc, mag.az, "2016/04/02")
# Declination will be automatically calculated if the altitude is also given:
data <- reduct.compass(loc, mag.az, "2016/04/02", alt=c(1,2,0))
# Alternatively, the altitude can be automatically retrieved from a horizon profile:
hor <- downloadHWT('HIFVTBGK')
data <- reduct.compass(hor, mag.az, "2016/04/02")