Plant Activity in December 2011
The photosynthetic activity of plants (NDVI) is illustrated by means of two NDVI maps of the Western Cape.
Plant Activity (NDVI) during 21-31 December 2011 compared to long term mean
The first map shows the plant activity within the current season compared to the long term mean (figure 1), through this we can detect if any deviation in plant growth during the current season occurred from the corresponding long term mean. Green patches would indicate above normal plant growth for the current season, which is observed mostly in parts of the Central Karoo and Eden. The white areas in the West Coast and Cape Winelands indicate normal conditions.
Percentage Average Seasonal Greenness October to December 2011 versus the long term mean
The second map illustrates the Percentage Average Seasonal Greenness (PASG) for the period October to December (figure 2), which is basically an accumulation of monthly NDVI values for the mentioned period, giving an overall summary of plant activity conditions during those months. The predominant green and yellow areas show that for most of the province normal photosynthetic conditions prevailed during October and December for the current season. Even better plant growth conditions were recorded east of Beaufort West.