A dataset containing example sampling sites from well-known Wisconsin lakes. These coordinates are useful for testing with real lake boundaries from OpenStreetMap.
Format
A data frame with 8 rows and 4 variables:
- Site
Unique site identifier
- lake.name
Name of the lake
- latitude
Latitude in decimal degrees (WGS84)
- longitude
Longitude in decimal degrees (WGS84)
Details
The dataset includes sites from three Wisconsin lakes:
Lake Mendota (3 sites) - Madison's largest lake, well-studied
Lake Monona (2 sites) - Connected to Mendota via Yahara River
Geneva Lake (3 sites) - Popular recreational lake in SE Wisconsin
Examples
# Load the dataset
data(wisconsin_lakes)
# View the data
head(wisconsin_lakes)
#> Site lake.name latitude longitude
#> 1 Mendota_N Lake Mendota 43.1125 -89.4234
#> 2 Mendota_S Lake Mendota 43.0756 -89.4012
#> 3 Mendota_Deep Lake Mendota 43.0995 -89.4045
#> 4 Monona_1 Lake Monona 43.0634 -89.3612
#> 5 Monona_2 Lake Monona 43.0589 -89.3789
#> 6 Geneva_E Geneva Lake 42.5912 -88.4312
# Use with lakefetch (requires internet connection)
# \donttest{
sites <- load_sites(wisconsin_lakes)
#> Loaded 8 rows with columns: Site, lake.name, latitude, longitude
#> Using columns: Latitude = latitude, Longitude = longitude
#> Preserved lake name column: lake.name
#> Final valid samples: 8
#> Detected location from column 'lake.name': 3 lakes
lake_data <- get_lake_boundary(sites)
#> Converting to spatial format...
#> Spherical geometry (s2) switched off
#> Downloading lake boundaries from OpenStreetMap...
#> Site spread is 1 degrees - querying 5 site clusters
#> Found 117 polygons
#> Found 5 multipolygons
#> Found 97 polygons
#> Found 3 multipolygons
#> Found 198 polygons
#> Found 17 multipolygons
#> Found 142 polygons
#> Found 15 multipolygons
#> Found 71 polygons
#> Found 6 multipolygons
#> Download complete in 2.9 minutes
#> Combining results...
#> Total water bodies found: 671
#> Auto-detected UTM Zone: 16N
#> Transforming to UTM for analysis...
#> Processing lake polygons...
#> Warning: repeating attributes for all sub-geometries for which they may not be constant
#> Warning: repeating attributes for all sub-geometries for which they may not be constant
#> Filtered 44 water bodies < 1e-04 km2
#> Deduplicating 210 duplicate lake entries...
#> Processed 417 unique lake polygons
#> Total area: 95.66 km2
#> Spherical geometry (s2) switched on
results <- fetch_calculate(sites, lake_data)
#> Effective fetch method: top3
#> Using default depth: 10 m
#> Assigning sites to lakes...
#> Checking direct intersections...
#> 4 sites matched directly
#> Checking 4 unmatched sites with 100m tolerance...
#> 0 additional sites matched within tolerance
#> Trying name-based matching using 'lake.name' column...
#> Matched 1 sites to 'Lake Mendota' via name matching from 'Lake Mendota'
#> Matched 1 sites to 'Geneva Lake' via name matching from 'Geneva Lake'
#> Warning: Skipped 2 site(s) named 'Geneva Lake': too far from OSM lake 'Geneva Lake' (>500m). Site(s) may be on a different water body. Sites: Geneva_W_7, Geneva_Center_8
#> Site assignment summary:
#> Matched: 6/8
#> Unmatched: 2
#> Unmatched sites claim to be in: Geneva Lake
#> Unmatched coordinate range:
#> Lat: 4715662.0902 to 4716097.5342
#> Lon: 375904.1842 to 378924.2756
#> TIP: Try lakefetch_options(gps_tolerance_m = 100) for larger buffer
#> TIP: Check if the lake exists in OpenStreetMap at openstreetmap.org
#> Sites per lake:
#> Lake Monona: 2 sites
#> Lake Mendota: 3 sites
#> Geneva Lake: 1 sites
#> Calculating fetch for multiple lakes...
#> Buffering sites 10m inward
#> Angle resolution: 5 degrees
#> Warning: Skipping 2 sites not matched to any lake: Geneva_W_7, Geneva_Center_8
#> Processing 3 lake(s)...
#> Using parallel processing with 3 cores for 3 lakes
#> Fetch calculation complete.
#> Adding lake context (NHD integration)...
#> Fetching NHD waterbodies...
#> Found 584 NHD waterbodies
#> Processing lake: 3361036
#> Warning: attribute variables are assumed to be spatially constant throughout all geometries
#> Warning: attribute variables are assumed to be spatially constant throughout all geometries
#> Found 1 outlet(s) and 5 inlet(s)
#> Warning: st_centroid assumes attributes are constant over geometries
#> Processing lake: 1997948
#> Warning: attribute variables are assumed to be spatially constant throughout all geometries
#> Warning: attribute variables are assumed to be spatially constant throughout all geometries
#> Found 1 outlet(s) and 4 inlet(s)
#> Warning: st_centroid assumes attributes are constant over geometries
#> Processing lake: 7943245
#> Found 1 outlet(s) and 5 inlet(s)
#> Warning: st_centroid assumes attributes are constant over geometries
#> Lake context complete.
# }