View source: R/direction_summary.R
direction_summary | R Documentation |
Summarizes the time difference between the first and last movement directions for each unique tag ID. Input data are created by tag_direction
, which determines the direction of movement for each detection event in join_multireader_data
.
direction_summary(dir_df, include_stationary = FALSE)
dir_df |
output from |
include_stationary |
if TRUE, all detections are summarized. If FALSE, only detections with a known movement direction (up or down) are included in the summary. |
direction_summary
isolates the first and last direction of movement from tag_direction
and determines the time difference in seconds and days. Directions are U for upstream movement, D for downstream movement, and S for no movement, or consecutive detection at the same location.
It is common for a tag to be detected multiple times at the same antenna, which will result in a movement direction of S, or stationary. The user is encouraged to examine direction summaries for include_stationary = TRUE and include_stationary = FALSE to become familiar with their data. When include_stationary = FALSE, there may be fewer tag ids in the direction summary than in the full data set.
Returns a tibble object.
Annika Putt <annika@instream.net>
import_ORFID
for importing data files from Oregon RFID ORMR and ORSR antenna readers.
join_multireader_data
for combining data from Oregon RFID ORMR and ORSR antenna readers into a multi-reader array.
tag_direction
for determining movement direction of detections in systems with a linear migration route.
# Create a list containing compiled reader data: readers <- list(reader_us, reader_ds) # Join data into a multi-reader array: PIT_data <- join_multireader_data(readers) # List readers: unique(PIT_data$LOC) # Determine tag direction for animals moving from downstream to upstream: dir <- tag_direction(PIT_data, c("downstream_A1", "upstream_A1")) # Determine the time difference between first and last detections: dir_summary <- direction_summary(dir)
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