findnds | R Documentation |
Identify the next downstream site from a set of candidates
findnds(hierarchy, catchname, candidates)
hierarchy |
a dataframe containing catchment id and next downstream (nextds) id fields |
catchname |
a catchment id for which a a list of downstream catchments ids will be returned. |
candidates |
a vector of candidate catchment ids. Note this need not be a complete hierarchy |
a list of downstream catchment ids for each catchment in catchnames. Returns -1 where there is no downstream site
Function depends on the next downstream field in a stream network 'hierarchy' table (dataframe). Can be used to support further aggregation of environmental variables for sub-catchments downstream of a list of catchments of interest (e.g. for calculating barrier numbers).
data(mwcats)
#find site next downstream of the first site in the catchment list
findnds(hierarchy = mwcats[,c(1:2)], catchname = mwcats$site[1], candidates=mwcats$site)
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