example_lake: Example Circular Lake Polygon

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

Example Circular Lake Polygon

Description

A simple circular lake polygon for demonstration and testing purposes. This synthetic lake has known geometry (1 km radius) which makes it useful for validating fetch calculations.

Usage

example_lake

Format

An sf object with 1 row and 3 variables:

osm_id

Identifier (synthetic)

name

Lake name

area_km2

Surface area in square kilometers (~3.14 km²)

geometry

POLYGON geometry in UTM Zone 18N (EPSG:32618)

Details

The lake is centered at UTM coordinates (500000, 4800000) with a radius of 1000 meters. For a site at the center, fetch should equal 1000 m in all directions.

Source

Synthetic data for demonstration and validation

Examples

# Load the dataset
data(example_lake)

# View structure
print(example_lake)

# Plot the lake

library(ggplot2)
ggplot(example_lake) + geom_sf()

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