Earth  ID: 4452

Vegetation greening trend in Canada and Alaska: 1984-2012

High-latitude regions have been warming rapidly since the last century, at a rate higher than the global average. At continental scales, satellite data since the 1980s have indicated increased vegetation productivity (greening) across northern high latitudes, and a productivity decline (browning) for certain areas of undisturbed boreal forest of Canada and Alaska. These remote sensing results have been corroborated by in-situ evidence.

This research provides a spatially complete view of the vegetation greenness change for all of Canada and Alaska by calculating per-pixel NDVI trend from all available 1984–2012 peak-summer Landsat-5 and -7 surface reflectance data. By incorporating observations from overlapping scenes, researchers obtained up to 160 valid NDVI values for certain areas from this 29-year period, establishing the mid-Summer greenness trend.

This animation shows the resulting greenness trend over Canada and Alaska with special attention focused on the regions of Quebec and northern Alaska.

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Visualization Credits

Cindy Starr (GST): Lead Visualizer
Junchang Ju (USRA): Scientist
Jeffrey Masek (NASA/GSFC): Scientist
Matthew R. Radcliff (USRA): Producer
Eric Sokolowsky (GST): Data Provider
Joycelyn Thomson Jones (NASA/GSFC): Project Support
Leann M. Estrada (GST): Project Support
Laurence Schuler (ADNET Systems, Inc.): Technical Support
Ian Jones (ADNET Systems, Inc.): Technical Support
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LDCM: Landsat Data Continuity Mission

Data Used:
Landsat/Landsat NDVI Trend (1984–2012) 1984-2012

SVS >> Landsat
GCMD >> Location >> Canada
GCMD >> Location >> Alaska
SVS >> Hyperwall
NASA Science >> Earth

GCMD keywords can be found on the Internet with the following citation: Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version