I have an interactive map with a very large amount of different points. Depending on user selection, various points are shown or not-shown.
These points are divided into several categories, each with potentially 20-30 sub-categories.
My current idea is to create a general hierarchy like the following:
Cat 1 => blues Cat 2 => greens Cat 3 => reds Cat 4 => browns
Each of these color groups would be divided into colors based on some criteria in each category.
I'm not concerned with color blindness issues (too many colors needed to worry about this - plus, there is a popup attached to each point giving far more detail). I'm not even really concerned too much with differentiation beyond the 4 categories, but I did think it might look better if there was some differentiation.
I've looked at Colorbrewer, but they don't have recommendations for this amount of colors.
So my question is what you all do for color symbology in situations like this? What are (if any) best practices when you have to deal with a lot of different colors?