What is evidence?

similar to how others use other resources like google street view, often, i’ll reference other observations with better photos as evidence for observations with poor quality photos, if i can logically tie them together. for example, this observation of a pileated woodpecker (https://www.inaturalist.org/observations/21242065) with a grainy photo taken on a phone from a long distance probably was never going to achieve a research grade on its own, but i bumped it up to research grade based on another observation that was made roughly around the same time in the same location.