airdas_read: Read AirDAS file(s)

In swfscAirDAS: Southwest Fisheries Science Center Aerial DAS Data Processing

Read AirDAS file(s)

Description

Read one or more fixed-width aerial survey DAS text file(s) generated by TURTLEP, or another AirDAS program, into a data frame, where each line is data for a specific event

Usage

airdas_read(
  file,
  file.type = c("turtle", "caretta", "survey", "phocoena"),
  skip = 0,
  tz = "UTC",
  ...
)

Arguments

file	filename(s) of one or more AirDAS files
file.type	character; indicates the program used to create file. Must be one of: "turtle", "caretta", "survey", or "phocoena" (case sensitive). Default is "turtle"
skip	integer: see read_fwf. Default is 0
tz	character; see strptime. Default is UTC
...	ignored

Details

Reads/parses aerial survey DAS data into columns of a data frame. If file contains multiple filenames, then the individual data frames will be combined using rbind

See airdas_format_pdf for information about AirDAS format requirements for the specific file types (programs)

Value

An airdas_dfr object, which is also a data frame, with AirDAS data read into columns. The data are read into the data frame as characters, with the following exceptions:

Name	Class	Details
EffortDot	logical	TRUE if "." was present, and FALSE otherwise
DateTime	POSIXct	combination of 'Date' and 'Time' columns, with time zone tz
Lat	numeric	'Latitude' columns converted to decimal degrees in range [-90, 90]
Lon	numeric	'Longitude' columns converted to decimal degrees in range [-180, 180]
Data#	character	leading/trailing whitespace trimmed for non-comment events (i.e. where 'Event' is not "C" )
file_das	character	base filename, extracted from the file argument
line_num	integer	line number of each data row
file_type	character	file.type argument

Examples

y <- system.file("airdas_sample.das", package = "swfscAirDAS")
airdas_read(y, file.type = "turtle")

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