"The map is truly a beautiful bit of geologic history. For more info on it, see my previous blog post. So many amazing swirls and details in the river's course. Rendering it as a slippy map makes it easy to see the map in great detail, for instance the Old River Control Structure, a site threatened by the floodwaters of 2011. (Interestingly, the modern channel was built on relatively dry land.) The opacity slider (or text box) in the upper right lets you look through the Fisk map to a contemporary Google map. Check out this flood plain, for example. The satellite view contains echoes of the various old meanders, too, like these curved fields."

"Lovers of literature, grammar and language, this is the place where you can work together to improve future generations of technology. By indicating relationships between words and phrases you will help to create a resource that is rich in linguistic information.
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"This paper describes mechanisms for asynchronous collaboration in the context of information visualization, recasting visualizations as not just analytic tools, but social spaces. We contribute the design and implementation of sense.us, a web site supporting asynchronous collaboration across a variety of visualization types. The site supports view sharing, discussion, graphical annotation, and social navigation and includes novel interaction elements. We report the results of user studies of the system, observing emergent patterns of social data analysis, including cycles of observation and hypothesis, and the complementary roles of social navigation and data-driven exploration."

Layers can overlap. Via Doug Knox at the Newberry Library.