leri v0.0.1

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Access Landscape Evaporative Response Index Raster Data

Finds and downloads Landscape Evaporative Response Index (LERI) data, then reads the data into 'R' using the 'raster' package. The LERI product measures anomalies in actual evapotranspiration, to support drought monitoring and early warning systems. More info on LERI is available at <https://www.esrl.noaa.gov/psd/leri/>.

Readme

leri: R package for the NOAA Landscape Evaporative Response Index

CircleCI AppVeyor build
status Codecov Project Status: WIP – Initial development is in progress, but there
has not yet been a stable, usable release suitable for the
public.

The leri R package facilitates access to the NOAA Landscape Evaporative Response Index data product.

Installation

You can install the development version of leri with devtools:

# install.packages("devtools")
devtools::install_github("earthlab/leri")

Example

The LERI product is available from the year 2000 to present at a 1 km spatial resolution over the continental United States, at the following timescales:

  • 1, 3, 7, and 12 month
  • 8 day accumulated or non-accumulated during the growing season (April - Oct.)

If we were interested in medium term drought, we could get 3 month timescale LERI data for a particular date as follows:

library(leri)
r <- get_leri(date = "2018-09-01", product = "3 month")
#> Loading required namespace: ncdf4
r
#> class      : RasterLayer 
#> dimensions : 2844, 6617, 18818748  (nrow, ncol, ncell)
#> resolution : 0.009, 0.009  (x, y)
#> extent     : -126.009, -66.456, 23.949, 49.545  (xmin, xmax, ymin, ymax)
#> crs        : +init=epsg:4326 +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0 
#> source     : memory
#> names      : LERI_03mn_20180901.nc 
#> values     : 3.448276, 96.55172  (min, max)

The get_leri function will download the NetCDF files from the NOAA ftp server and read them as RasterStack objects, which facilitates any other operations that users may need via the raster package. For example, we could plot the data using the raster::plot function:

library(raster)
#> Loading required package: sp
library(viridis)
#> Loading required package: viridisLite

plot(r, col = cividis(10, direction = -1), 
     main = "3 month LERI data for 2018-09-01")

LERI Resources

More information on the creation and recommended usage for LERI can be found here: https://www.esrl.noaa.gov/psd/leri/

Other potentially useful resources include:

Functions in leri

Name Description
get_leri Get LERI data
No Results!

Vignettes of leri

Name
leri-roi-tutorial.Rmd
No Results!

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Details

License GPL-3
URL https://github.com/earthlab/leri
BugReports https://github.com/earthlab/leri/issues
VignetteBuilder knitr
Encoding UTF-8
LazyData true
RoxygenNote 6.1.1
NeedsCompilation no
Packaged 2019-09-06 17:42:28 UTC; max
Repository CRAN
Date/Publication 2019-09-09 11:00:02 UTC

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