This function allows the user to view the nominal orbits (all or a selection)
available_nominal_orbits(
orbit_area = NULL,
technical_specs_url = "https://icesat-2.gsfc.nasa.gov/science/specs",
verbose = FALSE
)either NULL or a character string specifying the earth partition to use, it can be one of 'antarctic', 'arctic', 'western_hemisphere' and 'eastern_hemisphere'
a character string specifying the technical specs website
a boolean. If TRUE then information will be printed out in the console
a list object with the available nominal orbits
https://icesat-2.gsfc.nasa.gov/science/specs
require(IceSat2R)
#.............................
# all available nominal orbits
#.............................
nomin_orb = available_nominal_orbits(verbose = TRUE)
#> The available Icesat-2 orbits will be red from 'https://icesat-2.gsfc.nasa.gov/science/specs' ...
#> Access the data of the technical specs website ...
#> Extract the .zip files and the corresponding titles ...
#> Keep the relevant data from the url's and titles ...
#> Process the nominal and time specific orbits separately ...
#> Adjust the Dates of the time specific orbits ...
#> Create the nominal orbits data.table ...
#> Create the time specific orbits data.table ...
#> Return a single data.table ...
#> Elapsed time: 0 hours and 0 minutes and 0 seconds.
nomin_orb
#> $antarctic
#> [1] "https://icesat-2.gsfc.nasa.gov/sites/default/files/page_files/antarcticaallorbits.zip"
#>
#> $arctic
#> [1] "https://icesat-2.gsfc.nasa.gov/sites/default/files/page_files/arcticallorbits.zip"
#>
#> $western_hemisphere
#> [1] "https://icesat-2.gsfc.nasa.gov/sites/default/files/page_files/ICESat2groundtracksWesternHem.zip"
#>
#> $eastern_hemisphere
#> [1] "https://icesat-2.gsfc.nasa.gov/sites/default/files/page_files/ICESat2groundtracksEasternHem.zip"
#>
#........................
# specific nominal orbits
#........................
nomin_orb = available_nominal_orbits(orbit_area = 'arctic',
verbose = TRUE)
#> The available Icesat-2 orbits will be red from 'https://icesat-2.gsfc.nasa.gov/science/specs' ...
#> Access the data of the technical specs website ...
#> Extract the .zip files and the corresponding titles ...
#> Keep the relevant data from the url's and titles ...
#> Process the nominal and time specific orbits separately ...
#> Adjust the Dates of the time specific orbits ...
#> Create the nominal orbits data.table ...
#> Create the time specific orbits data.table ...
#> Return a single data.table ...
#> Elapsed time: 0 hours and 0 minutes and 0 seconds.
nomin_orb
#> $arctic
#> [1] "https://icesat-2.gsfc.nasa.gov/sites/default/files/page_files/arcticallorbits.zip"
#>