Data properties: - size - color - stroke width Variants: - pie charts - ellipses (two data axes)

Data properties: - size - length - direction - arrow head/body ratio Variants: - straight up, then curved to direction - sideways triangles - chevrons - straight arrows - https://www.unicode.org/charts/PDF/U2190.pdf

do you think a spike map is just a special case of a shift map?

No, I wouldn't go so far. Spike maps don't incorporate direction, which seems to be the primary aspect of shift maps.

> It might be interesting to try shift map as an alternative/supplement to a bivariate choropleth For what kind of data? Do you have something specific in mind?

this isn't bivariate but it is showing a shift: https://observablehq.com/@codingwithfire/registered-voters-by-county-2016-2018 could imagine the angle of the line being driven by a bivariate scale and height / color could map to magnitude or something

The WaPo link is missing.

oops, fixed thanks!

Data properties: - color - density (~ opacity) Variants (abstractions): - binned - voronoi - gradients

Data properties: - width - height - color - shape segments Variants: - bars - silos - arrows

Hatching in different directions (horizontal, vertical, diagonal) and densities could be used to display multiple properties.

i love the idea that the angle of the hatching can encode a metric!

https://observablehq.com/@clhenrick/health-equity-tracker-data-visualization-precedence looks like another good resource

Some more resources: - Guide to bivariate choropleth maps: https://www.joshuastevens.net/cartography/make-a-bivariate-choropleth-map/ - Color palette creation guide: https://blog.graphiq.com/finding-the-right-color-palettes-for-data-visualizations-fcd4e707a283

The color palette guide also touches on accessibility.

The importance of square-root based scales for disks: https://observablehq.com/@toja/same-area-different-shapes

Twirls: https://observablehq.com/@bartok32/the-relentless-march-to-musical-oblivion

this is also something really important to consider in the shift maps: https://observablehq.com/@mbostock/methods-of-comparison-compared

added all these to the inspiration gallery, and moved it just below the Table of contents