Qualitative Display of Air Quality Data

Graphical excellence is that which gives to the viewer the greatest number of ideas in the shortest time with the least ink in the smallest space.

Edward Tufte, The Visual Display of Quantitative Information

This post briefly summarizes our thoughts on best practices for designing public-facing data graphics for air quality data. Focus will be on the types of charts we feel are appropriate to use with data (e.g. from low-cost sensors) that may not be as accurate as data collected by monitors using Federal Regulatory or Federal Equivalent Methods (see FRMs/FEMs and Sensors). Visualization types discussed will include:

  • maps
  • time-series charts
  • calendars
  • status and forecast tables
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Cross-origin requests with beakr

beakr is a lightweight and flexible web framework that allows you to incorporate R code as the Middleware responsible for handling web requests. At Mazama Science, we developed beakr to simplify the process of creating R-based web services that we use to deliver a variety of products: data files, images, rendered Rmarkdown documents, etc.

In this article, we discuss using beakr to set a CORS header and create an example beakr instance that can respond to cross-origin javascript requests.

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Web Frameworks for R – A Brief Overview

Having recently announced the beakr web framework for R, we have received several questions about context and why we choose beakr over other options for some of our web services. This post will attempt to answer some of those questions by providing a few opinions on beakr and other web frameworks for R.

The comparison will by no means be exhaustive but will attempt to briefly summarize some of the key features each web framework has to offer. While there are some differences in the approach each package takes to developing web services, they all share similar basic functionality. In the end, the choice of a particular framework will come down largely to personal preference.

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Standard Dates

One of the big jokes among people who manage scientific datasets goes like this:

The great thing about standards is … there are so many to choose from!

Ba-dum-bum crash!

While this one liner may never make it to late-night TV, there is much truth to it.  Many “standards” exist, and many more are invented each month to accommodate the special needs of new types of data or new software for processing data.

One standard, however, stands far above other options and should always be adopted: ISO 8601– the international standard for representing dates and times.

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The world of scientific data management, analysis, visualization and public access is changing so rapidly it can be difficult to keep up with developments even in one’s own field.  Staying abreast of progress in all areas of science, let alone business, is an impossibility.

Then there are big picture questions about how the whole scientific endeavor is changing:

  • Does the long tradition of intellectual property rights with respect to science data apply in today’s cut-and-paste world?
  • How can scientists and policymakers use on-line tools to collaborate across the vast divide that separates them?
  • What role does the interested, intellegent layman play in the the dissemination and analysis of scientific data?
  • How can better delivery of data and analysis products improve the utility of publicly sponsored, publicly owned data?

These are the types of questions that occupy us every day at Mazama Science.  We spend a tremendous amount of time thinking about them ourselves and seeking answers from others in our broad community of contacts.

In this blog we hope to distill some of that group knowledge in the hopes that it may be useful or inspiring to those attempting to do similar work — supporting a data-focused, scientific approach to society’s pressing issues.

Happy Exploring!

— Jon