Accessibility Options for Overlapping Points?

[mrworthington]

Curious if there's a more accessible way to identify overlapping points on a map. While I know there's a subtractive and additive options for points, I'm curious about accessibility for those are color blind. I have a couple of ideas and figured I'd toss them out in case either are appealing or feasible:

Patterns

1) Implement patterns in areas where points overlap, like a hatch.

Jittering

2) Jitter points with something like this, so a user can see all the points at a given location.

[anthonynorth]

Jittering / spidering looks doable https://codepen.io/Pessimistress/pen/dypEWMO