An array of 45 satellite images of the greenness of the global land surface. Many individual images have been composited to produce an average landcover greenness for each month from April 1985 to December 1988. The images largely cover the ice-free land areas and have been arranged in columns of 12 months each. Each column is not a calendar year; instead it runs from April to March. This 'year' conveniently captures the changes in the Northern and Southern Hemispheres and coincides with the average life span of an El Nino event.
These NDVI images are colour coded from mauve (no greenness, low NDVI values) through red - yellow - green - blue (high greenness and NDVI values).
If you scan down any column of these images, you can appreciate the change in greenness within 'years'. If you scan across the rows, ie for any one month, you can appreciate the greenness variation between 'years'.
There are two points I wish to highlight from these images. The first is for you to realise just how little of the Australian continent is green compared with the rest of the world. The second point is the enormous change in greenness that takes place over the huge land masses of Europe and North America during the Northern Hemisphere spring and summer, May, June and July.
There is an enormous amount of fascinating detail in these images that can be explored at your leisure. I have not tired of them yet. I hope you never will.
Click here to play the images in chronological order.
Click here to view individual images