What it is
STANAG 7194 is the NATO Standardization Agreement on the imagery interpretability rating scale (NIIRS). Edition 2 was promulgated in September 2018, sponsored by MC, MCJSB, JINT, and covers the publication AIntP-7, Edition A. NATO has not released STANAG 7194 publicly, so this page describes it from public NATO publications that cite it.
What NATO publications say it covers
AEDP-02 states: "STANAG 7194 promotes interoperability for the exchange of data between JISR collection management activities, imagery exploitation, and imagery capabilities." It adds: "The NIIRS allows for the evaluation of imagery quality for all kinds of imagery, applicable for still and motion imagery for the different technical sensors types and use of a consistent measure for such evaluations."
AEDP-12 cites STANAG 7194 in defining a metadata field, niirs, as "The producer's estimate of the NIIRS at the center of the image." It gives that field the type float and references STANAG 7194, Edition 1 for it. AEDP-12's list of referenced documents names STANAG 7194, Edition 2 with AIntP-7, Edition A, ver.1, alongside standards such as STANAG 4609. AEP-84 lists STANAG 7194 among STANAGs including STANAG 7023 and STANAG 7149, ahead of a separate list of STANAGs that it recommends the UCS "should also be compliant with". Neither publication adds further description of the standard's content.