add_weather_context: Add Weather Context to Fetch Results

In lakefetch: Calculate Fetch and Wave Exposure for Lake Sampling Points

Add Weather Context to Fetch Results

Description

Adds historical weather metrics and cumulative wave energy to fetch calculation results.

Usage

add_weather_context(
  fetch_results,
  datetime_col = "datetime",
  windows_hours = c(24, 72, 168),
  depth_m = NULL
)

Arguments

fetch_results	sf object with fetch results (must have datetime column)
datetime_col	Name of the datetime column
windows_hours	Vector of time windows in hours (default c(24, 72, 168))
depth_m	Water depth for orbital velocity calculation

Details

The input data must have a datetime column in POSIXct format or a format that can be parsed (ISO 8601, or common date-time formats).

Value

sf object with additional weather columns

Examples

csv_path <- system.file("extdata", "sample_sites.csv", package = "lakefetch")
sites <- load_sites(csv_path)
lake <- get_lake_boundary(sites)
results <- fetch_calculate(sites, lake)

# Add datetime to results
results$results$datetime <- as.POSIXct("2024-07-15 14:00:00")

# Add weather context
results_with_weather <- add_weather_context(
  results$results,
  datetime_col = "datetime"
)

lakefetch documentation built on March 20, 2026, 5:10 p.m.