pri deals with image files to calculate a photosynthetic parameter called photochemical reflectance index (PRI).
You can install:
# install.packages("devtools") # if not installed
devtools::install_github("KeachMurakami/pri")
devtools::session_info()
#> Session info --------------------------------------------------------------
#> setting value
#> version R version 3.3.1 (2016-06-21)
#> system x86_64, darwin13.4.0
#> ui X11
#> language (EN)
#> collate en_US.UTF-8
#> tz Asia/Tokyo
#> date 2017-05-05
#> Packages ------------------------------------------------------------------
#> package * version date source
#> backports 1.0.4 2016-10-24 cran (@1.0.4)
#> devtools 1.12.0 2016-06-24 CRAN (R 3.3.0)
#> digest 0.6.11 2017-01-03 cran (@0.6.11)
#> evaluate 0.10 2016-10-11 cran (@0.10)
#> htmltools 0.3.5 2016-03-21 CRAN (R 3.3.1)
#> knitr 1.15.1 2016-11-22 cran (@1.15.1)
#> magrittr 1.5 2014-11-22 CRAN (R 3.3.1)
#> memoise 1.0.0 2016-01-29 CRAN (R 3.3.1)
#> Rcpp 0.12.9.4 2017-03-03 Github (RcppCore/Rcpp@0566d7c)
#> rmarkdown 1.3 2016-12-21 cran (@1.3)
#> rprojroot 1.2 2017-01-16 cran (@1.2)
#> stringi 1.1.2 2016-10-01 cran (@1.1.2)
#> stringr 1.2.0 2017-02-18 cran (@1.2.0)
#> withr 1.0.2 2016-06-20 CRAN (R 3.3.1)
#> yaml 2.1.14 2016-11-12 cran (@2.1.14)
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