These data have been derived from the Hansen et al Forest cover change datasets (see below for citation, website and source). The original data are provided as 30m resolution 10 degree tiles for presence or absence of Forest loss and forest gain between 2000 and 2013, and for percentage cover in 2000 of trees over 5m high. The specific definitions are as follows:
Tree canopy cover for year 2000 (treecover2000) 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.
Global forest cover loss 2000–2012 (loss) Forest loss during the period 2000–2012, 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).
Global forest cover gain 2000–2012 (gain)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).
These have been resampled to 300m and 1 kilometre (0.002778, and 0083334 degrees respectively) for the EDENEXT/VMERGE region and 1km for the world and combined into single layers of percentage loss, gain, and treecover for the EDENext coverage. Note that these are not real % values as the input loss or gain dis defined as disturbance or complete loss/gain and are better defined as the % 30m pixels within the resampled pixel for which some loss or some gain has been recorded
In indication of the net change between 2000 and 2013 – a percentage net change index - has also been calculated for each resampled pixel as % gain – %loss.
For the global data this net change index has been used to provide some idea of forest cover in 2013 calculated as (%treecover2000 + (%treecover2000*(net change/100))) assuming that the average amount lost or gained within a 30m pixel is 100% or (%treecover2000 + (%treecover2000*(net change/200))) assuming that the average amount lost or gained within a 30m pixel is 50%
Location: Datasets can be downloaded from the EDENext Data Archive
Category: Land Cover
Download Packages:
Hansen Forest cover change datasets EDENext 1km
Hansen Forest cover change datasets EDENext 300m
Category: Sister Projects > IDAMS Data > Land Cover (IDAMS)
Download Packages:
Hansen Forest cover change datasets World 1km
Further info:
The original 30m global datasets and a 30m resolution year of loss dataset are available from the website cited below, or from The Data Management Team on request. The citation for the original data is as follows: 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 (15 November): 850–53. Data available on-line from: http://earthenginepartners.appspot.com/science-2013-global-forest. A pdf of the reference is available at this link. The source to quote on any published graphic is: Derived by EDENext Data Management Team from original datasets produced by Hansen et al 2013/UMD/Google/USGS/NASA. The images are in Geotiff format, with geographic projection.
The filenames are as follows:
EDHANSEN300m.zip
hansenforgain00278edall.tif = % pixels with gain 2000-2013 at 300m
hansenforloss00278edall.tif = % pixels with loss 2000-2013 at 300m
hansenfornetch00278edall.tif = net % change 2000-2013 at 300m
hansentreecover2000edall00278.tif = % tree cover in 2000 at 300m
EDHANSEN1km.zip
hansenforgain00833edall.tif = % pixels with gain 2000-2013 at 1km
hansenforloss00833edall.tif = % pixels with loss 2000-2013 at 1km
hansenfornetch00833edall.tif = net % change 2000-2013 at 1km
hansentreecover2000edall00833.tif = % tree cover in 2000 at 1km
WORLDHANSENFOREST008334.ZIP
HANSENgainwdall008334.tif = Global % pixels with gain 2000-2013 at 1km
HANSENlosswdall008334.tif = Global % pixels with loss 2000-2013 at 1km
Hansennetchwdall008334.tif =Global net % change 2000-2013 at 1km
HANSENtreecover2000wdall008334.tif = % tree cover in 2000 at 1km
Hansentrcov2013wdall008334rcl.tif = Tree cover 2013 assuming all loss/gain is 100% of 30m pixel
Hansentrcovpc50ch2013wdall008334rcl.tif = Tree cover 2013 assuming all loss/gain is 50% of 30m pixel
