Analyzer mappings describe how columns of meta file are mapped to properties of the gas analyzer
analyzer(time_stamp = "timestamp", conc_columns = NULL, pressure = NULL, pressure_factor = 1, temperature = NULL, manual_temperature = NULL, offset = "offset", duration_count = FALSE, plot = "plot", date = "date", start = "start", end = "end", trimmer = NULL, V = 0.01461, A = 0.098)
| time_stamp | Timestamp |
|---|---|
| conc_columns | A named vector declaring the columns containing the actual mixing rations. E.g. `c(CO2 = "CO2")`. |
| pressure | Column containing the atmospheric preasure in mbar. |
| pressure_factor | If preasure is provided in a different unit than mbar, a conversion factor can be specified. |
| temperature | Column containing the temperature in °C. |
| manual_temperature | Column conatining an additional measured temperature. If specified, the `temperature` value is ommited. |
| offset | (Default = `0:0`). Colon separated value for offsetting the datasets. First value offsets the first, second value offsets the last datapoint. Positive values shrinken the dataset i.e `2:3` skips two datapoints at the beginning and truncates three datapoints at the end of the dataset. Negative values expand the dataset i.e. `-2:-3` add two datapoints at the beginning and three datapoints at the end of the dataset. |
| duration_count | If TRUE, `end` is determined by the number of datapoints within each measurement. If FALSE, `end` is treated as duration or point in time. |
| plot | (Default = "plot"). Column containing the ID of the measurement location. |
| date | (Default = "date"). Column containing the day of measurement. Format: "YYYY-MM-DD". |
| start | (Default = "start"). Column containing the start of measurement. Format: "HH:MM" or "HH:MM:SS". |
| end | (Default = "end"). Column containing the end of measurement. There are several options: Point in Time. Format: "HH:MM" or "HH:MM:SS" (e.g. `"13:43"`). Duration in minutes (e.g. `5`). Number of Datapoints regardless of the effectively elapsed time (e.g. `10`). This behaviour is controlled by `duration_count`. Alternatively a single number treated as Duration or Number of Datapoints for all measurements (e.g. `5`, behaviour is again controlled by `duration_count`). |
| trimmer | A function to trim the intervall between `start` and `end`. See `trim_time()` for details. |
| V | Volume of the chamber. |
| A | Area of the chamber. |
An object of clas lyzr.
# setup analyzer custom_analyzer <- analyzer( #define datastructure time_stamp = "Time", conc_columns = c(CH4 = "[CH4]_ppm", CO2 = "[CO2]_ppm"), pressure = "GasP_torr", pressure_factor = 1.33322, temperature = "AmbT_C", trimmer = trim_time, # define metadata structure plot = "plot", date = "date", start = "start", end = "end", #define chamber dimensions V = 0.01461, A = 0.098 )