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Generate Fine-Scale Photo-Point Observations

sampling_design_fine_scale_points.Rd

Fine-Scale Photo-Point Sampling

Usage

sampling_design_fine_scale_points(data_fixed_locs_obs, config_pt)

Arguments

data_fixed_locs_obs

An sf object representing fine-scale transect observations produced by sampling_design_fine_scale_fixed(). Must include:

  • Reef, Site, Transect, Year, Date

  • Benthic cover values: HCC, SC, MA

  • Transect-level coordinates

config_pt

A list containing fine-scale point sampling parameters:

  • Depths – number of depths per transect

  • Depth_effect_multiplier – magnitude of the depth effect

  • Number_of_transects_per_site – number of transects (used for checks)

  • Number_of_frames_per_transect – frames per transect

  • Points_per_frame – points per frame

  • seed – optional random seed (if provided)

Value

An sf object representing point-level sampling, containing:

  • Reef, Site, Transect, Year, Depth, Frame, Point Number

  • Group (HCC, SC, MA)

  • Value – benthic cover value after depth effects

  • geometry – inherited from transect-level coordinates

Details

Distributes benthic cover (HCC, SC, MA) across photo-frames and point-level observations. Expands fine-scale transect data to include depth effects, allocates points in proportion to benthic cover, and returns a point-level sampling dataset suitable for analysis or modelling.

This function:

  • Expands each transect across multiple depths

  • Applies a randomised depth effect to benthic cover values

  • Converts cover percentages to point allocations

  • Expands into individual point observations and assigns frame/point IDs

Author

Murray