I am trying to display small mammal trapping data in ArcMap 10.3.1.
I am dealing with a point feature class. There are 3 relevant fields in the attribute table, one for each night of trapping, containing categorical data (type of species caught). Each night, the traps can catch 1 of any 4 species. So, some points will have a capture of the same species across the 3 nights, while others might capture a different species each night. There might be any combination of species caught during the 3 nights of trapping for any particular point.
I am interested in displaying which species were caught at which trap. I don't care about the order or if a trap caught the same species more than once.
I am having difficulty finding an efficient way to display these data. I've tried "Unique values, many fields" in the symbology tab of properties box, but that gives all permutations while I am only interested in relevant combinations.
I think one efficient display would be to assign each species a circle with a unique color and diameter. This way, multiple species could be seen for each point if one trap catches multiple species, and the legend would only have to show 1 symbol for each species.
Another problem I cannot resolve is how to collapse the information when one point has duplicate data across fields. In other words, how to collapse if one trap catches the same species for multiple nights.