sflr, just read this
scrolling through 1945-1978, you're right; it'd take a stretch based only on 1945 to take Tagore Stream as part of Sungei Seletar Simpang Kanan. (i made this comment bfr i got used to comparing the diff. overlays 😅)

in any case i'll study _if_/how libmaps  can be used first