Download Hansen Forest 2000-2013 Change

Source: R/download.hansen.R

Download of Hansen Global Forest Change 2000-2013

download.hansen(
  tile,
  data.type = c("loss"),
  download.folder = c("current", "temp")
)

Arguments

tile

Granule index (See project URL for granule grid index)
data.type

Type of data to download options: 'treecover2000', 'loss', 'gain', 'lossyear', datamask', 'first', 'last'
download.folder

Destination folder

Value

Downloaded Hansen forest loss tif files

Details

Available products: treecover2000, loss, gain, lossyear, datamask, first, or last

  • treecover2000 - (Tree canopy cover for year 2000) - Tree cover in the year 2000, defined as canopy closure for all vegetation taller than 5m in height. Encoded as a percentage per output grid cell, in the range 0-100.

  • loss - (Global forest cover loss 2000-2013) - Forest loss during the period 2000-2013, defined as a stand-replacement disturbance, or a change from a forest to non-forest state. Encoded as either 1 (loss) or 0 (no loss).

  • gain - (Global forest cover gain 2000-2012) - Forest gain during the period 2000-2012, defined as the inverse of loss, or a non-forest to forest change entirely within the study period. Encoded as either 1 (gain) or 0 (no gain).

  • lossyear - (Year of gross forest cover loss event) - A disaggregation of total forest loss to annual time scales. Encoded as either 0 (no loss) or else a value in the range 1-13, representing loss detected primarily in the year 2001-2013.

  • datamask - (Data mask) - Three values representing areas of no data (0), mapped land surface (1), and permanent water bodies (2).

  • first - (Circa year 2000 Landsat 7 cloud-free image composite) - Reference multispectral imagery from the first available year, typically 2000. If no cloud-free observations were available for year 2000, imagery was taken from the closest year with cloud-free data, within the range 1999-2012.

  • last - (Circa year 2013 Landsat cloud-free image composite) - Reference multispectral imagery from the last available year, typically 2013. If no cloud-free observations were available for year 2013, imagery was taken from the closest year with cloud-free data, within the range 2010-2012.

Project website with 10x10 degree granule index: http://earthenginepartners.appspot.com/science-2013-global-forest/download_v1.1.html

References

Hansen, M. C., P. V. Potapov, R. Moore, M. Hancher, S. A. Turubanova, A. Tyukavina, D. Thau, S. V. Stehman, S. J. Goetz, T. R. Loveland, A. Kommareddy, A. Egorov, L. Chini, C. O. Justice, and J. R. G. Townshend. (2013) High-Resolution Global Maps of 21st-Century Forest Cover Change. Science 342:850-53.

Author

Jeffrey S. Evans jeffrey_evans@tnc.org

Examples

if (FALSE) {
# Download single tile
 download.hansen(tile=c('00N', '130E'), data.type=c('loss', 'lossyear'), 
                 download.folder=getwd())

# Batch download of multiple tiles
tiles <- list(c('00N', '140E'), c('00N', '130E'))
  for( j in 1:length(tiles)){
    download.hansen(tile=tiles[[j]], data.type=c('loss'))  
  }

}