Vegetation Greening Trend in Canada and Alaska: 1984-2012
- Visualizations by:
- Cindy Starr
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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.
Please give credit for this item to:
NASA's Scientific Visualization Studio
- Cindy Starr (GST) [Lead]
- Jeffrey Masek (NASA/GSFC)
- Junchang Ju (USRA)
- Matthew Radcliff (KBRwyle)
- Joycelyn Thomson Jones (NASA/GSFC)
- Leann Johnson (GST)
- Ian Jones (ADNET)
- Laurence Schuler (ADNET)
- Eric Sokolowsky (GST)
PapersThis visualization is based on the following papers:
MissionsThis visualization is related to the following missions:
Datasets used in this visualization
Landsat Landsat NDVI Trend (1984–2012)
This research used a nominal peak greenness period, July 1 to August 31, to accommodate tundra of all regions for Landsat data selection. We only considered the terrain-corrected scenes, excluding scenes that have cloud cover more than 80%. As a result, a total of 87,762 Landsat scenes over 1271 Path/Row locations were selected from 1984-2012. Of these, 63% were from Landsat-5, as Landsat-5 provided the only data source for 1984-1998 and continued to acquire data until 2011. This work aims to provide 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.See more visualizations using this data set
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