Angelos Tzotsos :
This is an ISODATA implementation in C, written under GPL by Christos
Iossifidis, a colleague of mine at NTUA.
Would anyone be interested porting it to GRASS?
http://users.ntua.gr/chiossif/Free_As_Freedom_Software/isodata.c
Curious: how much effort would this be for an experienced GRASS-dev?
Nikos