Import measurements from BRACE db
import_data_brace.RdExtract measurements from a set of measurements in the brace format.
Arguments
- file
Path to folder or file containing the brace archives.
- tz
Optional character string to assign time zone
- timebegin
a logical indicate if the time stamp of the concentration should be shifted by one hour to transform it from "time-begin" to "time-end", as it is the case with dispersion models. If TRUE the time stamp is shifted by 1 hour. If FALSE (default) no time shift is performed.
Details
Given the path to a folder with brace measurements it imports all data contained therein. If in the input folder a metadata file (with coo extension) exists, it is read and automatically merged with observation data.
Each concentration value read from the database is assumed to be associated
to the previous hourly time interval. For example, a concentration value
with time stamp 2022-06-16_00:00 is associated to the one hour interval
ranging from the 23:00 of 15/6/2022 to the 00:00 of the 16/6/2022.
If we should calculate a daily average, such value would contribute to the
15/6/2022 day and the data.frame should be treated accordingly (for example
by subtracting 1 minute to each time stamp).
This behaviour is coherent with what happens with hourly values arising from
a dispersion model.
When timebegin flag is set to TRUE the measured concentration read
from the database is assumed to be associated to the beginning of the
following time interval. In this case, each time stamp is shift forward by
one hour in order to transform each concentration value from "time-begin" to
"time-end" and be consistent with dispersion model data.