Rarely do you have evenlyspaced data across an entire geographic space. Here is a way to fill in the gaps.
R

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Mapping Irregular Data with Interpolation in R

Interactive charts in R
Interactive charts in R are still soso, but if you don’t mind giving up some flexibility and just want something quick without having to learn a new language, there are…

Tilegrams in R
Last month Pitch Interactive launched an online tool for tiled cartograms, or tilegrams for short. Upload your statebystate data, and it does the rest. Now you can make them in…

Learning R Versus d3.js for Visualization
For those who work with R and d3.js, the differences between the two are obvious. But for those who are brand new to this world, the names might as well…

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Quickfire HowTo for Visualizing Proportions in R
There are many ways to show parts of a whole. Here are quick oneliners for the more common ones.

Beeswarm Plot in R, to Show Distributions
Try the more elementbased approach instead of your traditional histogram or boxplot.

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How to Make Square Pie Charts in R
Instead of traditional pie charts that rely on angles and arc lengths to show parts of a whole, try this easiertoread version.

R in the data journalism workflow at FiveThirtyEight
R has found its way into a good number of news groups who do data journalism. Andrew Flowers for FiveThirtyEight talks about how they use the statistical computing language throughout…

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Annotating Charts in R
Let the data speak for itself they say. That doesn't work a lot of the time, and when that happens, you need to explain.

5 Tips for Learning to Code for Visualization
Here are some tips to get you started, based on my own experiences with R, and more recently, the JavaScript library d3.js.

A Crash Course for Visualizing Time Series Data in R
Learn to visualize temporal patterns in a couple of days.

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Drawing Lines and Segments in R
Show connections and changes over time with start and end points.

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Drawing Circles and Ellipses in R
Whether you use circles as visual encodings or as a way to highlight areas of a plot, there are functions at your disposal.

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Drawing Squares and Rectangles in R
R makes it easy to add squares and rectangles to your plots, but it gets a little tricky when you have a bunch to draw at once. The key is to break it down to the elements.

Voronoi Diagram and Delaunay Triangulation in R
The
deldir
package by Rolf Turner makes the calculations and plotting straightforward, with a few lines of code. 
Comparing ggplot2 and R Base Graphics
Figure out which is best with a sidebyside comparison.

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Adding Legends in R
Make sure you explain your visual encodings so that others can interpret them.

Emergency room data in R
For my graphic on emergency room visits over time and the other on things that get stuck, I used data from the National Electronic Injury Surveillance System, which is maintained…

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How to Customize Axes in R
For presentation purposes, it can be useful to adjust the style of your axes and reference lines for readability. It's all about the details.

R growth on StackOverflow reigns supreme
Joshua Kunst did a quick analysis on tag usage on StackOverflow, the question and answer site for programming. The R tag isn’t the top of course, but it is growing…

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Animated Pyramid Chart in R
Make a bunch of charts, string them together like a flip book, and there's your animation. Sometimes good for showing changes over time. Always fun to play with.

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Bivariate Area Charts in R
Quickly compare two time series variables with this linearea chart hybrid that originated in the 1700s.

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How to Make Maps in R That Include Alaska and Hawaii
The conterminous United States always gets the attention, while Alaska and Hawaii are often left out. It is time to bring them back into view.

Tufte style charts in R
Lukasz Piwek is chipping away at a collection of Tuftestyle charts using R, along with the code snippets. Fittingly, the project is called Tufte in R. The Tufte stuff is…

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How to Map and Use GeoTIFF Files in R
It's like working with a bunch of tiny dots, and oh look, all of sudden patterns emerge.

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How to Make Horizon Graphs in R
The relatively new and lesser known time series visualization can be useful if you know what you're looking at, and they take up a lot less space.

R Consortium for further development of community
The Linux Foundation announced the R Consortium to provide support to the R Foundation and to organizations developing the language. “Millions of data scientists and academic researchers use R language…

Working with R at the New York Times
Amanda Cox from the New York Times was on the Data Stories podcast. You should listen. She talks about how she uses R, workflow at the New York Times, and…

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How to Make Variable Width Bar Charts in R
The code to create these bar chart variations is almost the same as if you were to make a standard bar chart. But make sure you get the math right.

R is quirky, flawed, and an enormous success
Most people who use R on the regular learned the language in the context of a subject outside of programming. They learned R as they learned statistical methods, or they…