New Chart: Daily Light Integral (DLI) and Growth Potential (GP)

To show the relative amount of photosynthetically active radiation (PAR) during the times of the year when the temperatures are close to an optimum for warm-season grass growth, I have made this new chart based on a series of calculations that give an estimate of the daily light integral (DLI).

A New Way of Looking at the Weather

At the Sustainable Turfgrass Management in Asia 2012 conference at Thailand, I made a presentation entitled A New Way of Looking at the Weather in which I described the justification for presenting weather data in this format and showed how the bubble charts can be used to make better decisions about grass selection and turfgrass maintenance practices.

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On Data, Charts, and Software

Data shown on these charts are from the World Meteorological Organization and, in the case of the Japan motion chart, from the Japanese Meteorological Agency.

The static charts were made using the ggplot2 package in R. Motion charts were made using the googleVis package in R. This document explains the procedure I used to make a motion chart with data from 52 world cities.

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