We recommend using the new N-Sensor biomass overlay.
The N-Sensor Index is not prone to saturate as fast as the NDVI and has a better correlation to nitrogen uptake. The new N-Sensor biomass overlay enables to analyse crop growth through the whole growth cycle and even across seasons.
Low biomass is represented by brown tones. After “growing” through a range of greens, when the canopy is fully evolved, it moves into blue and then into purple (some crops).
How does the new overlay differ from the old N-Sensor overlay?
The old N-Sensor overlay also uses the N-Sensor Index. However, the colour scale is adjusted to the lowest and the highest index value in a satellite image. This is done independently of time in the season and absolute growth differences.
This overlay is useful to identify growth differences within a field but doesn't allow to compare images of the same field over time.
How does the new overlay differ from the NDVI overlay?
The NDVI overlay uses the NDVI Index to display differences in crop growth. Before highest biomass the NDVI index saturates, and you can no longer recognise differences between highest and lowest growth within a field.
The NDVI index is shown on a fixed colour scale from very low biomass to maximum/saturation biomass.