Get Hydrography90m regional unit IDs — get_regional_unit

Given the coordinates of input points (in WGS84), the function identifies the IDs of the regional units of the Hydrography90m in which the points are located. Input is a point data frame. The regional units refer to non-interrupted basins (as opposed to the 20°x20° tiles). These IDs can then be used to download the Hydrography90m regional unit raster mask(s) using download_tiles().

Usage

get_regional_unit_id(data, lon, lat, quiet = TRUE)

Arguments

data: a data.frame or data.table that contains the columns regarding the longitude / latitude coordinates in WGS84.
lon: character. The name of the column with the longitude coordinates.
lat: character. The name of the column with the latitude coordinates.
quiet: logical. If FALSE, the standard output will be printed. Default is TRUE.

References

https://gdal.org/programs/gdallocationinfo.html

Author

Afroditi Grigoropoulou

Examples

# Download test data into the temporary R folder
# or define a different directory
my_directory <- tempdir()
download_test_data(my_directory)

# Read the species data
species_occurence <- read.table(paste0(my_directory,
                                       "/hydrography90m_test_data",
                                       "/spdata_1264942.txt"),
                              header = TRUE)

# Get the regional unit ID
get_regional_unit_id(species_occurence, lon = "longitude",
                    lat = "latitude")