List available collections stored on an openEO server and return them as a CollectionList - a named list of Collection objects.
The names are the collection IDs. Although the result at describe_collection() is also a Collection, the Collection object of returned
from list_collections() is considered a list entry with less detailed information. The collection list is stored internally as the package
environment variable data_collection, which can be accessed and set with active_data_collection().
list_collections(con = NULL)
active_data_collection(collection = NULL)Connection object (optional) otherwise active_connection()
is used.
the 'CollectionList' object of list_collections to be set as the active data collection in the package environment or left empty or NULL to return the package environment variable.
object of class 'CollectionList'