airdas_dfr-class: 'airdas_dfr' class

In swfscAirDAS: Southwest Fisheries Science Center Aerial DAS Data Processing

airdas_dfr class

Description

The airdas_dfr class is a subclass of data.frame, created to provide a concise and robust way to ensure that the input to airdas_processadheres to certain requirements. Specifically, objects of class airdas_dfr are data frames with specific column names and classes, as detailed in the 'Properties of airdas_dfr' section. Objects of class airdas_dfr are created by airdas_read or as_airdas_dfr, and are intended to be passed directly to airdas_process.

Subsetting or otherwise altering an object of class airdas_dfr will cause the object to drop its airdas_dfr class attribute, although note that combining two airdas_dfr objects using rbind will return an object with a airdas_dfr class attribute. airdas_process will then try to coerce the object to a airdas_dfr object. It is strongly recommended to pass an object of class airdas_dfr to airdas_process before subsetting, e.g. for events from a certain date range.

Properties of airdas_dfr objects

Objects of class airdas_dfr have a class attribute of c("airdas_dfr", "data.frame"). They must have a column file_type where all values are one of: "turtle", "caretta", "survey", or "phocoena" (case sensitive; see airdas_read for more details). airdas_dfr objects also must not have any NA event codes.

In addition, they must have the following column names and classes:

Column name	Column class
Event	"character"
EffortDot	"logical"
DateTime	c("POSIXct", "POSIXt")
Lat	"numeric"
Lon	"numeric"
Data1	"character"
Data2	"character"
Data3	"character"
Data4	"character"
Data5	"character"
Data6	"character"
Data7	"character"
EventNum	"character"
file_das	"character"
line_num	"integer"
file_type	"character"

See Also

as_airdas_dfr

swfscAirDAS documentation built on Aug. 9, 2023, 1:06 a.m.