OMNIDIA assists diatom researchers in managing their diatom inventories derived from water samples and calculating diatom indices.

OMNIDIA was initially developed for French water agencies to assist in managing diatom inventory databases and calculating water quality indices. It is now used globaly and has become a crucial reference for diatom research projects.
The data for OMNIDIA is collected by Michel COSTE, Professor Emeritus and former Director of Research at IRSTEA in Bordeaux, France.