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Update get_pfafstetter_basins.R #81

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Update get_pfafstetter_basins.R
domisch Dec 10, 2024
7f48182
Merge branch 'main' into dev_pfafstetter
domisch Dec 11, 2024
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10 changes: 9 additions & 1 deletion R/get_pfafstetter_basins.R
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Expand Up @@ -173,7 +173,15 @@ g_dt_tmp <- setDT(igraph::as_data_frame(g))
g <- graph.data.frame(g_dt_tmp[,c("from", "to")], directed = T)
# Get all possible paths from the outlet
outlet = which(degree(g, v = V(g), mode = "out")==0, useNames = T)
headwater = which(degree(g, v = V(g), mode = "in")==0, useNames = T)
#headwater = which(degree(g, v = V(g), mode = "in")==0, useNames = T) # all, slow


### Get a pre-selection of those 100 main stream candidates that have the
### longest distance to the outlet (the most contributing stream is likely to
### to be one of these)
headwater <- g_dt_tmp[order(-out_dist)]$from[1:100]
headwater <- headwater[!is.na(headwater)] # remove NAs if less than 100 subc_id



# Stop if too few stream segments (currently three, need to go lower?)
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