Hansen Global Forest Change v1.11 (2000-2023)

Dataset Availability

2000-01-01T00:00:00Z–2023-12-31T00:00:00Z

Dataset Provider

Hansen/UMD/Google/USGS/NASA

Earth Engine Snippet

ee.Image("UMD/hansen/global_forest_change_2023_v1_11")

Tags

forest geophysical landsat-derived umd

hansen

Description

Results from time-series analysis of Landsat images in characterizing global forest extent and change.

The 'first' and 'last' bands are reference multispectral imagery from the first and last available years for Landsat spectral bands corresponding to red, NIR, SWIR1, and SWIR2. Reference composite imagery represents median observations from a set of quality-assessed growing-season observations for each of these bands.

Please see the User Notes for this Version 1.11 update, as well as the associated journal article: Hansen, Potapov, Moore, Hancher et al. "High-resolution global maps of 21st-century forest cover change." Science 342.6160 (2013): 850-853.

Bands

Resolution
30.92 meters

Bands

Name	Units	Min	Max	Wavelength	Description
treecover2000	%	0	100		Tree canopy cover for year 2000, defined as canopy closure for all vegetation taller than 5m in height.
loss					Forest loss during the study period, defined as a stand-replacement disturbance (a change from a forest to non-forest state).
Bitmask for loss Bit 0: Forest loss during the study period. 0: Not loss 1: Loss
gain					Forest gain during the period 2000-2012, defined as the inverse of loss (a non-forest to forest change entirely within the study period). Note that this has not been updated in subsequent versions.
Bitmask for gain Bit 0: Forest gain during the period 2000-2012. 0: No gain 1: Gain
first_b30				0.63-0.69µm	Landsat Red cloud-free image composite (corresponding to Landsat 5/7 band 3 and Landsat 8/9 band 4). Reference multispectral imagery from the first available year, typically 2000.
first_b40				0.77-0.90µm	Landsat NIR cloud-free image composite (corresponding to Landsat 5/7 band 4 and Landsat 8/9 band 5). Reference multispectral imagery from the first available year, typically 2000.
first_b50				1.55-1.75µm	Landsat SWIR1 cloud-free image composite (corresponding to Landsat 5/7 band 5 and Landsat 8/9 band 6). Reference multispectral imagery from the first available year, typically 2000.
first_b70				2.09-2.35µm	Landsat SWIR2 cloud-free image composite (corresponding to Landsat 5/7 band 7 and Landsat 8/9 band 7). Reference multispectral imagery from the first available year, typically 2000.
last_b30				0.63-0.69µm	Landsat Red cloud-free image composite (corresponding to Landsat 5/7 band 3 and Landsat 8/9 band 4). Reference multispectral imagery from the last available year, typically the last year of the study period.
last_b40				0.77-0.90µm	Landsat NIR cloud-free image composite (corresponding to Landsat 5/7 band 4 and Landsat 8/9 band 5). Reference multispectral imagery from the last available year, typically the last year of the study period.
last_b50				1.55-1.75µm	Landsat SWIR1 cloud-free image composite (corresponding to Landsat 5/7 band 5 and Landsat 8/9 band 6). Reference multispectral imagery from the last available year, typically the last year of the study period.
last_b70				2.09-2.35µm	Landsat SWIR2 cloud-free image composite (corresponding to Landsat 5/7 band 7 and Landsat 8/9 band 7). Reference multispectral imagery from the last available year, typically the last year of the study period.
datamask					Three values representing areas of no data, mapped land surface, and permanent water bodies.
Bitmask for datamask Bits 0-1: Three values representing areas of no data, mapped land surface, and permanent water bodies. 0: No data 1: Mapped land surface 2: Permanent water bodies
lossyear		0	23		Year of gross forest cover loss event. Forest loss during the study period, defined as a stand-replacement disturbance, or a change from a forest to non-forest state. Encoded as either 0 (no loss) or else a value in the range 1-23, representing loss detected primarily in the year 2001-2023, respectively.

Terms of Use

Terms of Use

CC-BY-4.0

Citations

Citations:

• 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. 10.1126/science.1244693 Data available on-line at: https://glad.earthengine.app/view/global-forest-change.

DOIs

• https://doi.org/10.1126/science.1244693

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Code Editor (JavaScript)

var dataset = ee.Image('UMD/hansen/global_forest_change_2023_v1_11');
var treeCoverVisParam = {
  bands: ['treecover2000'],
  min: 0,
  max: 100,
  palette: ['black', 'green']
};
Map.addLayer(dataset, treeCoverVisParam, 'tree cover 2000');

var treeLossVisParam = {
  bands: ['lossyear'],
  min: 0,
  max: 23,
  palette: ['yellow', 'red']
};
Map.addLayer(dataset, treeLossVisParam, 'tree loss year');

Open in Code Editor

Hansen Global Forest Change v1.11 (2000-2023)

Results from time-series analysis of Landsat images in characterizing global forest extent and change. The 'first' and 'last' bands are reference multispectral imagery from the first and last available years for Landsat spectral bands corresponding to red, NIR, SWIR1, and SWIR2. Reference composite imagery represents median observations from a set …

UMD/hansen/global_forest_change_2023_v1_11, forest,geophysical,landsat-derived,umd

2000-01-01T00:00:00Z/2023-12-31T00:00:00Z

Google Earth Engine

https://developers.google.com/earth-engine/datasets

• https://doi.org/10.1126/science.1244693