What's the plural form of photointerpretation? Here's the word you're looking for.
Answer
The noun photointerpretation can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be photointerpretation.
However, in more specific contexts, the plural form can also be photointerpretations e.g. in reference to various types of photointerpretations
or a collection of photointerpretations.