Function to find the identifier(s) used to signify model domain outlets, i.e. the "downstream" ID of outlet catchments, in a GeoData file.
This is typically just one number, often e.g. '0' or '-9999', but can be one or several IDs if the GeoData file originates from a HYPE sub-model
set-up, e.g. created with the 'SelectAro' program. Use OutletSubids to find the actual SUBID values of the outlet catchments.
Usage
OutletIds(gd)
Value
OutletIds returns a vector of outlet IDs.
Arguments
gd
Data frame with two columns subid and maindown (not case-sensitive).
Typically a 'GeoData.txt' file imported using ReadGeoData.
Details
OutletIds finds the unique outlet IDs of a GeoData file. The outlet ID of a typical model
is a single placeholder number, often e.g. '0' or '-9999', but there can be several outlet IDs, e.g. one or
several SUBIDs if the GeoData file originates from a HYPE sub-model set-up, created
with the 'SelectAro' tool.