estimating daily light integral at 4 cities in Tennessee
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These files make calculations or estimations of:

  • Ra, extraterrestrial solar radiation
  • Rs, global solar radiation
  • daily light integral, DLI

First, dli_tn/nrcc_nearby_stations.R downloads Rs data from selected stations and the Hargreaves equation estimate of Rs is calculated for comparison.

The dli_tn/tn_four_cities.R file works with temperature data from Memphis, Nashville, Chattanooga, and Knoxville, using the Hargreaves equation to make an estimate of Rs for each of those locations.

A further description of these calculations is posted at

In June 2016 I added the r/20160628_starkville.R script to calculate the estimated DLI for Starkville, MS.