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First, the stop light color scheme is not recommended because of red-green colorblindness. See Colorbrewer for a a more palatable set of color ramps. (FYI graduated symbology typically refers to icons …

Oftentimes when we make maps it is based on our subjective interpretation of what is aesthetically pleasing. I would like it if people posted examples of beautiful maps, displaying any phenomena in an …

A couple examples of beautiful flow maps An article in the open journal PLoS, Redrawing the Map of Great Britain from a Network of Human Interactions by: Carlo Ratti, Stanislav Sobolevsky, Francesco …

Although this map is aesthetically pleasing (at least the small multiples on the left), I believe it is quite poor when all three of the layers are plopped on top of one another. For what I believe ar …

I found a couple of examples of very poor choropleth maps posted on wikipedia depicting income inequality and poverty by nation. Although both metrics depict a continuous phenomenon, they chose seemin …

A rencent journal article I came across discusses exactly what @Aksel in another answer (Sun and Wong, 2010) (It is available here for free online, but that link is void of pictures of the maps as far …

I agree that small multiples are probably a good way to approach this problem. To supplement the map I would also suggest a scatterplot matrix of your variables, which would identify bivariate correla …

Here is a wonderful example of small multiples posted on Andrew Gelman's (and company blog) Statistical Modeling, Causal Inference, and Social Science. The map is of voter support for school vouchers …

I recently came across some of the work of Sidonie Christophe that has particular bearing to this subject. While in the particular paper I'm referencing (Christophe, 2011) she proposes a more general …

I think you may be interested in work described as time geography, and you may want to use search terms such as space-time-path or space-time-cube. In the space-time-cube technique I would imagine you …

You are really just asking about an effective color scheme to distinguish between foreground and background in this particular setting. I've speculated that the dark backgrounds work similar to the hi …

Several other threads on the site on flow mapping have various eligible candidates. How to create arcs between two points in Python? Representation of network flows Below is well known example fro …

I'd suggest you check out the Geo Vista site and their software. The Visual Inquiry Toolkit, provides a GUI program to implement the bi-variate chloropleth maps (I know one poster on here works at tha …

Another option not mentioned yet is aggregating the points at the same location and then displaying points as either proportional to the number of individual events they represent or have categorical …

I don't think I would recommend this at the start (more as a last resort for simplicity), but I have seen many subway maps actually manipulate the lines to be more orderly. Here is an example from the …