Download and Process GIMMS NDVI3g Data
We provide a set of functions to retrieve information about GIMMS NDVI3g
files currently available online; download (and re-arrange, in the case of
NDVI3g.v0) the half-monthly data sets; import downloaded files from ENVI
binary (NDVI3g.v0) or NetCDF format (NDVI3g.v1) directly into R based on the
widespread raster package; conduct quality control; and generate
monthly composites (e.g., maximum values) from the half-monthly input data.
As a special gimmick, a method is included to conveniently apply the
Mann-Kendall trend test upon Raster* images, optionally featuring
trend-free pre-whitening to account for lag-1 autocorrelation.
Pinzon, JE & Tucker, CJ (2014). A Non-Stationary 1981-2012 AVHRR NDVI3g Time Series. Remote Sensing, 6(8), 6929-6960. Available online at http://www.mdpi.com/2072-4292/6/8/6929/htm.
Pinzon, JE & Tucker, CJ (2016). A Non-Stationary 1981-2015 AVHRR NDVI3g.v1 Time Series: an update. In preparation for submission to Remote Sensing.