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.
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.
Examples
# Load the dataset
data(example_lake)
# View structure
print(example_lake)
#> Simple feature collection with 1 feature and 3 fields
#> Geometry type: POLYGON
#> Dimension: XY
#> Bounding box: xmin: 499000 ymin: 4799000 xmax: 501000 ymax: 4801000
#> Projected CRS: WGS 84 / UTM zone 18N
#> osm_id name area_km2 geometry
#> 1 example_001 Example Circular Lake 3.141593 POLYGON ((501000 4800000, 5...
# Plot the lake
# \donttest{
library(ggplot2)
ggplot(example_lake) + geom_sf()
# }