Skip to contents

Process Length Groups for Fish Over 100cm

process_over100_length_groups.Rd

Extracts and processes length data for large fish (over 100cm) from KoBoToolbox survey data. These are stored in separate repeated group structures outside the main species_group.

Usage

process_over100_length_groups(df = NULL, species_long = NULL)

Arguments

df

The original raw data frame containing separate length group columns

species_long

A data frame with species groups already reshaped to long format

Value

A data frame with columns: submission_id, n_catch, length_range, length_over, count Returns NULL if no over-100cm length group data is found

Details

Length groups for fish over 100cm are stored separately from the main species_group structure, in columns following the pattern: species_group/no_fish_by_length_group_100/fish_length_over100

The function:

  1. Identifies columns matching the over-100cm pattern

  2. Pivots them to long format

  3. For fish_length_over100 entries, extracts the actual length value

  4. Links this data back to the corresponding species group via submission_id

  5. Assigns new n_catch values to avoid conflicts with existing species groups